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How to Become a Java Developer: Everything You Need to Know

The United States Bureau of Labor Statistics estimates there are more than 1,469,000  software developers around the country. According to data from 2021, 35.35% of those developers use Java , one of the world’s top five most widely used programming languages.

Naturally, learning Java and becoming a Java developer is a smart career choice for anyone interested in software development.

In this comprehensive guide, you’ll learn everything you need to know to become a Java developer. We’ll break down the skills you’ll need, the job responsibilities, and what you can expect your employer to pay you.

Let’s start!

What Is Java?

Before we explore everything you need to know to become a Java developer, you’ll need to understand what Java is.

Java is a programming language developers use for mobile, software, and web development. A small team called ‘The Green Team’ initially conceptualized Java in the early 1990s. That team included James Gosling, who later became known as the ‘Father of Java’ for his work. Gosling developed Java while working as an engineer at Sun Microsystems (a subsidiary of Oracle today).

Java was initially designed to be:

• Platform-independent
• High Performance
• Multithreaded
• Architecture Neutral
• Interpreted

Since Java’s release in 1995, many modern programming languages have descended from it, including Python, Scala, JavaScript, and PHP . Naturally, Java has remained one of the most popular programming languages to learn .

Currently, there are four different editions of Java:

• Java Card,  which people use to develop programs for devices with small processing capabilities (like SIM cards and ATM cards)
• Java Standard Edition (Java SE) , which people use to develop programs for desktops and servers.
• Java Micro Edition (Java ME) , which people use to develop programs for mobile devices (like iOS and Android phones).
• Java Platform Enterprise Edition (Java EE) , which people use to develop large-scale applications.

What Is Object-Oriented Programming?

Java is an Object-Oriented Programming (OOP) language, meaning it organizes design around objects (as opposed to functions and logic). An ‘object’ is an entity with a unique identity (i.e., a label), characteristics (sometimes called ‘state’), and behavior.

There are four critical principles of OOP development. These include:

• Encapsulation is a condition that’s achieved when an object’s state is private, enclosed in its class (a template with similar properties that developers use to create objects), and public functions can’t access it.
• Abstraction  occurs when objects only expose the key details you need to work with them (making your program easier to develop).
• Inheritance occurs when objects are structured into parent and child structures, sharing common logic without needing to be the same.
• Polymorphism  is a way to use child classes like their parent class without altering the child class.

When using OOP, many developers also rely on the SOLID principles of development (coined by Robert Martin or ‘Uncle Bob’). The SOLID principles include:

• S : The Single Responsibility Principle says a class should only be responsible for one problem (unless the problem is solved with interconnected subsystems).
• O : The Open-Closed Principle says that you should extend but not modify entities (i.e., functions, modules, and classes).
• L : The Liskov Substitution Principle says that you should be able to replace superclasses with subclasses without breaking your code.
• I : The Interface Segregation Principle says that you should create a separate interface for each client.
• D : The Dependency Inversion Principle, which says that higher-level modules shouldn’t support lower-level modules.

Java vs JavaScript

As Java and JavaScript have similar names, many newer developers often confuse the two. However, they’re distinctly different languages. Java is a compiling language, meaning it’s translated into machine code by compilers. Alternatively, JavaScript is an interpreted scripting language, meaning it’s translated into machine code when it’s run.

Java and JavaScript also have different uses. Developers primarily use Java for server-side development and JavaScript for client-side projects.

Java Developer vs Software Engineer

New developers also confuse Java developers with software engineers, though these professions are different, too. Java developers are highly specialized professionals that (usually) only work with Java projects.

Alternatively, software engineers have a broader skillset to work on different programming languages and projects. As Java developers and software developers have similar roles and skills, many professionals transition between the two roles for variety, a new challenge, or to learn new skills.

Now that you understand the basics of Java, you’re ready to learn more about Java development as a career.

What Is a Java Developer?

A Java developer (sometimes called a ‘Java engineer’ or a ‘Java dev’) is a specialized IT professional working with Java. Java developers are responsible for developing software, websites, and applications using Java.

Before you become a Java programmer, there are many vital things you need to consider, including whether you find the day-to-day work life of a Java developer exciting and whether you have the skills to fill the roles and responsibilities of a Java developer. This section will cover each of those considerations.

What Does a Java Developer Do?

The everyday work life of a Java developer depends on whether you are an entry-level, mid-level, or senior developer.

Entry-Level Java Developers

As an entry-level Java developer, you will likely enter the profession with limited professional experience. Naturally, you will spend your time:

• Developing your Java programming skills
• Writing basic code
• Fixing basic bugs
• Performing testing
• Helping your team plan Java projects
• Creating end-user documentation that helps users navigate the system

Mid-Level Java Developers

As a mid-level Java developer, you will have 2 – 5 years of professional experience and be highly knowledgeable about your business’s IT architecture. As your skills are more advanced than an entry-level Java developer, you will spend your work time:

• Writing more complicated code
• Fixing more advanced bugs
• Performing (or overseeing) testing
• Planning Java projects
• Creating end-user-documentation
• Working with vendors
• Managing junior developers

Senior Java Developers

As a senior Java developer, you will have 5+ years of experience, a deep understanding of your business’s IT systems, and expertise on various projects. You will likely spend your work time:

• Planning, consulting, and reviewing sophisticated Java projects
• Overseeing work done by junior staff members
• Overseeing the financial side of development

What Are The Responsibilities of a Java Developer?

As a Java developer, your specific daily responsibilities will depend on your employer’s needs. However, most Java developers perform similar role functions, including:

Working With IT Vendors

As a Java developer, your employer may expect you to work with the vendors that provide your business with infrastructure, software, and platforms (i.e., Infrastructure-as-a-service (IaaS) , platform-as-a-service (PaaS) , and Software-as-a-Service (SaaS) vendors). Specifically, you may need to:

• Develop relationships with existing vendors
• Develop criteria for new vendors
• Research vendor options and watch the market for new technology
• Evaluate offers and negotiate on your businesses behalf
• Prepare Request For Quote (RFQ) and bid documents

Liaising With IT Team

As a Java developer, you work closely with your business’s development team. This means you will need to attend regular standups and meetings, help colleagues with problems, and help your team plan and manage your projects. You may also consult with users, managers, and other teams about your Java projects.

Developing Code

Throughout your time as a developer, you will continuously develop code in Java. You may use this code in a new project, ongoing updates for an existing project, or bug fixes.

Testing Code

Once you’ve written code, you will need to test it with code review tools to identify potential issues. Your employer may expect you to perform a range of rests on your code, including functionality testing, static code testing, unit testing, and single-user performance testing. You may also need to participate in pass-around testing. Pass-around testing is a way development teams ask for feedback by emailing their colleagues their code before deployment. You can see an example of pass-around testing in the image below.

Deploying Code

As a Java developer, you will need to deploy code to deliver it to users successfully.

Debugging Software Problems

As no project is ever perfect, Java developers are responsible for resolving errors in their programs. Specifically, you will need to diagnose problems, develop a solution, and deploy that solution.

In many organizations, developers receive requests to debug problems found by other team members and users – so you will be expected to liaise with others throughout the debugging process.

Understanding Program Architecture

If you are an experienced developer, you will need to understand your business’s programs, IT infrastructure, and program architecture in-depth. Understanding program architecture is crucial, as it’ll inform how you develop new projects.

Preparing Updates

As developers must update programs to ensure they’re functional and secure, you need to develop regular updates. You will need to plan, design, test, deploy, and collect user feedback on the update to build efficiently. If you work in a large business or busy industry, you may need to manage multiple updates simultaneously.

Preparing End-User Documentation

As you will understand your project intimately as a developer, your employer will expect you to develop end-user documentation to help people use your program. This documentation includes installation guides, user manuals, release notes, and training manuals.

Monitoring Application Security and Performance

Finally, your employer will expect you to track your projects continuously. Continuous monitoring allows you to spot potential errors, track usage statistics, and identify things you could change to improve the program for users.

How Much Do Java Developers Make?

As Java developers are highly skilled and perform diverse responsibilities, becoming a Java developer can earn a good salary. According to Salary.com, the average Java developer salar y in the United States is $96,297 annually  (as of October 29th, 2021).

Half of all Java developers working full-time earn between $80,975 and $107.886 a year for their work. This deviation is due to a few factors, including the developer’s education, years of experience, their business (and its profitability), any management responsibilities they have, location, overtime, and bonuses.

If you want to see the full range of Java developer salaries in the US, take a look at the bell curve graph below.

For comparison, the average web developer earns between $60,000 – $75,000 a year .

What Skills Are Needed to Be a Java Developer?

If you want to become a Java developer, you will need to master some essential skills. That includes developing your:

Java Development Abilities

As a Java programmer, you will need to create code from scratch for a range of web-based and non-web-based projects. This means you will need to understand Java and use it to create new projects, updates, and fix bugs. You’ll also need to know:

• The differences between Java Card, Java SE, Java ME, and Java EE
• How to use common Java frameworks like the Spring framework and the Hibernate framework
• How to use development suites like DevKinsta

Code Testing Skills

As you will need to test your code before deployment, you will need to learn how to perform functionality testing, static code testing, unit testing, and single-user performance testing.

Many Java programs use SQL (Structured Query Language) when building and using databases. You will also need to understand how to use SQL. Ideally, you should also familiarize yourself with Oracle 12c, Microsoft SQL, and MySQL database systems.

Project Management Skills

As a Java developer, you will need to follow the Systems Development Lifecycle (SDLC). Naturally, you should understand how to take a project through the six phases: planning, analysis, design, implementation, testing and integration, and maintenance. You should also familiarize yourself with the waterfall and agile approaches to project management.

Project Architecture Skills

As you will need to design and build projects from the ground up, you must know how to construct a project’s architecture to be logical, consistent, and extendable long-term.

Vendor Liaison Skills

As many Java developers liaise with IT vendors, you will need good verbal and written communication skills. Ideally, you should also develop your negotiation skills and build rapport with others, making liaising with vendors easier.

Object-Oriented Programming Knowledge

As Java is an OOP language, you should understand the four OOP principles and the SOLID principles of OOP development.

How to Become a Java Developer

If you’re interested in becoming a Java developer, you can take six simple steps to build your skills and become a Java expert.

Let’s cover those steps now.

Step 1. Learn Java

First, you will need to learn how to code with Java. There are many great ways to learn Java, including podcasts, short courses, books, and tutorials. If you are looking for a tutorial, we recommend using The Java Tutorials  by Oracle, as it is free and comprehensive. The Java Tutorials cover topics like:

• The basics of Java design
• How to create Graphical User Interfaces (GUIs) with Java
• How to use the Java platform’s features
• How to deploy applications using Java Web Start and Java Plug-in

You could also use subreddits like r/LearnJava to connect with other budding Java developers. On the r/LearnJava subreddit, you’ll find Java resources, book recommendations, and posts from people looking for feedback on their code.

Step 2. Improve Your Java Project Management Skills

As you learn Java, you should also start improving your project management skills. During this step, you should focus on planning, designing, and building small-scale projects with Java. Managing small projects will help you develop your system architecture and management skills (as well as give you some projects to show potential employers during job interviews).

If you are looking for something to boost your resume, you could also complete a Java certification program. Oracle offers several Java certifications (though they can be expensive).

Step 3. Join the Java Community to Learn From Your Peers

Next, you should join the Java community so you can learn from your peers. Joining the community is a great way to improve your problem-solving skills and technical knowledge.

Watching other developers resolve problems will also help you learn to think like a developer. While there are many great Java communities online, we recommend checking out:

• StackOverflow’s Java tag
• Oracle’s Java Community

Step 4. Practice Your Skills and Develop a Portfolio

Next, you’ll want to practice your new Java skills and build a portfolio to show potential employers. You should aim to create several Java applications for your portfolio (including at least one web application). These projects don’t have to be sophisticated or perfect, as they are simply a way for you to demonstrate that you can develop a range of applications with Java.

Your portfolio doesn’t need to be over-the-top, either. Ultimately, the best developer portfolios focus on two key things:

• Introducing the reader to you through an “about me” section that describes your experience, skills, and interests
• Showing the reader your skills through a collection of 1-3 projects that you’ve created. To get the most out of these projects, you should include a short description of the project, screenshots of the development process, and a live link to the final project.

Step 5. Build Your Resume and Apply to Become a Java Developer

Once you’ve mastered Java and built a few small applications, you’re ready to redesign your resume and apply for a position as a junior Java developer.

When designing your resume, make sure you include your new Java developer skills. These may consist of Java development skills, code testing skills, SQL knowledge, project management skills, vendor liaison skills, and OOP knowledge. You should also add any ‘soft skills’ you have. Soft skills help people succeed at work and include communication, problem-solving, and teamwork skills.

You can find Java jobs on Indeed, LinkedIn, IT Career Finder, Monster, and ITJobBoard.net.

Step 6. Focus on Continuously Improving Your Java Skills

Finally, you should make sure you focus on continuously improving your Java developer skills in your new role. Growing your skills will help you succeed in your computer science career long-term, as you will be able to take on larger and more sophisticated projects.

What to Look For When Hiring A Java Developer

Each developer brings unique skills and expertise to work, but some key attributes make great developers stand out. So if you’re looking to hire a Java developer, make sure you look for someone with these attributes:

Someone Who is a Team Player

As Java developers must work together to resolve issues, launch new programs, or update programs, you’ll need someone to work in a team. When hiring a developer, look for someone with a history of uplifting and supporting their team members.

Someone Who is a Problem Solver

As Java development requires redesigning and fixing code that isn’t working, a good developer can review their code, find errors, and fix problems quickly. When hiring a developer, look for someone who thrives on feedback and can demonstrate excellent creative problem-solving skills.

Someone Who Can Continue to Learn

As Java development requires a lot of technical knowledge and expertise, the best developers are always learning. When hiring a developer, look for someone who can continue to grow their skills on the job.

Someone Who Can Manage Themselves

While Java development is a team sport, Java developers complete many of their daily tasks alone. Naturally, when hiring a Java developer, look for someone who can manage their schedule, stay focused, and deliver work with little oversight.

From 2019 to 2029, the United States Bureau of Labor Statistics estimates that software developer jobs will grow by 22% – which they describe as “much faster than average.” Naturally, becoming a Java developer is a fantastic career choice if you want to be part of the software revolution.

To be an excellent full-stack Java developer, you need to learn Java and build your expertise in database management, object-oriented programming, and project management. You’ll also need excellent communication and problem-solving skills as Java developers solve technical issues with the rest of their business’s IT department.

So what do you think? Is Java development for you?

Content & Marketing Editor at Kinsta, WordPress Web Developer, and Content Writer. Outside of all things WordPress, I enjoy the beach, golf, and movies. I also have tall people problems ;).

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Java - How to Create a PowerPoint Presentation

Creating an attractive PowerPoint presentation is a meticulous task that needs the cooperation of brain, eyes, and hands. In order to achieve a perfect effect, we need to constantly fine tune the details, such as adjusting the size and position of a shape, or changing the color of text. Due to this reason, creating PowerPoint documents manually is typically more efficient than using code. However, in certain cases, we may have to do it programmatically.

In this article, you’ll learn how to create a simple PowerPoint document and insert basic elements (including text shape, image shape, list, and table) into it by using Free Spire.Presentation for Java , which is a free class library for processing PowerPoint documents in Java applications. The main tasks of this tutorial are as follows.

Create a PowerPoint Document

Get the first slide and set background image, insert a text shape, insert an image shape, insert a list, insert a table, save the powerpoint document, add spire.presentation.jar as dependency.

If you are working on a maven project, you can include the dependency in pom.xml file using this:

If you are not using maven, then you can find the required jar files from the zip file available in this location . Include all the jar files into the application lib folder to run the sample code given in this tutorial.

Import Namespaces

By default, there is one blank slide preset in the newly created PowerPoint document.

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InfoQ Homepage Presentations DevOps for Java Developers

DevOps for Java Developers

Ixchel Ruiz discusses DevOps for Java developers.

Ixchel Ruiz has developed software application & tools since 2000. Her research interests include Java, dynamic languages, client-side technologies and testing. Java Champion, Ground breaker ambassador, hackergarten enthusiast, Open Source advocate, author, public speaker and mentor.

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InfoQ Live is a virtual event designed for you, the modern software practitioner. Take part in facilitated sessions with world-class practitioners. Hear from software leaders at our optional InfoQ Roundtables.

Ruiz: My name is Ix-chel Ruiz. I'm a Java champion. I work for JFrog. I have collaborated in some books, the most recent one is, "DevOps Tools for Java Developers." Let's start with the DevOps part. I would like to share with you the 2021 State of DevOps Report. This is the tenth report prepared by Puppet based on more than 2600 responses from all around the world. The results are clear. Organizations practicing DevOps consistently report more frequent deployments, shorter lead times to change, lower change failure rates, and faster mean time to recover. They also self-define their evolution in their DevOps transformation from high to low. For eight years, highly evolved DevOps teams have consistently demonstrated better performance across four key software performance metrics, deploying to production, on demand. Reporting change lead times and mean times to recover, under one hour. Change fail rates, under 5%. Far too many organizations reach a plateau in their DevOps evolution. This has been a consistent trend of a stagnation.

Luckily, plenty of improvements can be accomplished in two areas, platform and cultural initiatives. At the twin layer of the platform, increasing the self-service and seamless integration between different tools used on the software development cycle increases the adoption of DevOps practices faster. Highly evolved firms make heavier use of internal platforms from their engineers, enabling developers to access authentication, container orchestration, service-to-service authentication, tracing and observability, and logging requests. It is important that the process and the platform is well-defined, integrated, and easily available for all teams to adopt. One of the areas that still present the most challenges is the new culture adoption. To create a mechanism to entangle teams, it is important to create initiatives to promote a culture of knowledge sharing. Teams who share common tooling, language, or methodologies can actively share best practices with other teams, faster and more effectively. Lastly, all teams require a clear understanding of the IT infrastructure landscape.

DevOps and Java

On the other hand, as Java developers, we have some advantages that we can leverage. For example, a very healthy ecosystem with mature libraries for testing, metrics, observability, and whatnot, and build tools with scanning capabilities. We developers are consistently focused in two main things, improving the quality of the software that we build, and trying to release more valuable features in each release version. Even more, we know releasing a new version is a routine operation, where a consistent process can be followed. If we already are embracing the cultural change brought by the Agile development style, adding new methodologies like DevSecOps, shift left, will enable the optimization of the entire software development process: build, test, release, deploy, monitor, and observe the application in production.

What is DevSecOps? DevSecOps is a set of security assessments where we have a lot of tools of practices in different categories. For example, static application security testing. Tools in these categories can source code for known weaknesses and insecure coding practices, code smells. Software composition analysis tools analyze software to detect known software components such as open source and third party libraries, and identify any associated vulnerabilities. SCA complements SAST by finding vulnerabilities not detectable by scanning source code. Dynamic application security testing, DAST, scans applications in runtime. This enables an outside-in approach to testing all these applications for exploitable conditions that were not detectable in a static state. Web application firewalls monitor traffic at the application level, and detect potential attacks, and attempts to exploit vulnerabilities. Container image scanning tools can continuously and automatically scan container images with the C within the CI/CD pipeline and in container registries. Cloud security posture management solutions identify misconfigurations in cloud infrastructure. Finally, shift left. Shift left only brings testing and security measures into the code development process as early as possible, so moving towards us, the developers.

Testing and Security

I'm passionate about testing. Even when I have been advocating quite vocally about the benefits of testing in all these flavors, unit integration, contract, UI, end-to-end, REST API, acceptance and exploratory. Sometimes it's easy to disregard their importance. Security. In the last years, very dramatic vulnerabilities have brought more attention to secure dependencies early on the development cycle, and involving us, not only the Q&A, or security teams. There is another dimension that we haven't mentioned so far. For those of us that have decided to move towards microservices, we stand at the overlap of an architectural style, which introduces the idea of multiple services, while bringing security and testing concerns at an earlier stage of the development cycle of each one of them. Martin Fowler once described microservices as an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms. Built around business capabilities and independently deployable by fully automated deployment machinery. Maybe with a bare minimum of centralized management of these services, and they may be written in different programming languages. The challenge is improving the quality of the software, releasing more valuable features in all aspects of the process, from requirement specification, documentation, architecture, testing, security, automation, to collaboration between different tools are multiply. Micro, mini, or small services potentially written in different languages evolving at different rates as whole different products, and communicating between them, so changing some API contracts.

We really need tools that make all that overhead easier to manage. Let's talk about tools, or even better, let's first discuss, how do we manage our contracts? Because our APIs are contracts of communication between our different services, it doesn't matter the size. If we're using one of the most difficult protocols of communication, REST, then, how do we define document version, deprecate, or even show some of our examples to our different consumers? I strongly suggest you use the OpenAPI specification. It has really good tools for maintaining, publishing your documentation, and even creating automatic mocks or testing, verifying, and generating code for the client or the server. It is really interesting or important that you start using standards.

On the security part, bringing everything closer to the developer, I want to show you some of my favorite tools. Frogbot is a GitBot, actually, you can use it with GitLab, GitHub, or Bitbucket. It has different types of functionality. The one that I like the most is, one, you open a pull request, it automatically scans your pull request for known vulnerabilities. In case that exists, it will create a report telling you which component where the vulnerability is found, and even if there is a version that actually fixes this problem. Even before you are merging the code into your repo, you have all this information at your fingertips. Another one is the stock Docker extension that scans your Docker images and exactly provides you with a very cool report with all the vulnerabilities, again, the version, the known, and even advice from our security team. Our IDEs, in this case, I'm showing you an IntelliJ IDEA plugin. JFrog plugin that actually does the same thing, it scans your dependencies. In this case, it's a Maven project. In your IDE, it will tell you the vulnerabilities, the version, which components, even the reports.

We are lucky in the Java world, we have adopted the microservice architecture style with gusto. There are several frameworks out there that support microservices. For example, the Spring Boot, Quarkus, Micronaut, Dropwizard, among others. They provide their own testing libraries, or leverage known libraries like JUnit, Hamcrest, Mockito, AssertJ, or REST Assured.

WireMock is a simulator for HTTP based APIs, service virtualization tool or a mock server. Runs in a standalone process, without the HTTP server, or even in Docker. Selective proxying requests through the other host. Matching criteria can be used. Has record, replay. You can simulate faults, or define stateful behaviors. In version 2.32.0 released last December, the team introduced the ability to run WireMock without needing the HTTP server for a serverless deployment model.

REST Assured

REST Assured is a Java DSL for simplifying testing of REST and specifying request data, for example, path parameters, cookies, header, multi-value parameters. Also, verifying response data with ease, cookies, status, pattern matching, body, content in different formats, measuring responses. Supports authentication, OAuth1, OAuth2, and Spring support. In version 4.5.0, they upgraded Groovy from 3.0.8 to 3.0.9.

Testcontainers

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium browsers, or anything that can run in a Docker container. It will create all the containers as we have defined and while your tests are running, all of these will run correctly. As soon as they have finished, it will actually properly dispose of your resources. In version 1.6.3, they introduced the K3s modules for testing Kubernetes components.

Testing, Monitoring, and Observability

Even if we have a healthy number of unit integration, contract, end-to-end, REST APIs, acceptance and exploratory tests, we are still in a controlled and well-defined world, bound by our own imagination and assumptions of what could possibly happen in production. Without that, things may be a little bit different, or completely. How, where, what, how long, how fast is defined by our imagination, beliefs, technical capabilities, and assumptions. Sometimes we are not really testing, or we really don't have a clue what is going to happen out there. Sometimes we need to test in production. I know it sounds so wrong, we should say observe closely our services in production, and understand better the system state using a predefined set of metrics and logs. Monitoring application lets us detect failures. Monitoring is crucial for analyzing long trends, provides information on how the services are growing and how they are being utilized. Observability originated from control theory, measures how well you can understand a system's internal state from its external outputs. Observability uses instrumentation to provide insights that a monitoring and observable system allow us to understand and measure the internals, helping us figure out the cause from the effects.

Traces, Metrics, and Logs

There are three base pillars, traces. Traces track the progression of a single request. That is a trace. It's handled by a service that make up an application. A request may be initiated by a user or an application. Distributed testing is a form of tracing that transfers process, network, and security boundaries. Metric is a measurement about a service, captured at runtime. Logically, the moment of capturing one of these measurements is known as a metric event, which consists not only of the measurement itself, but the time that it was captured, with all the associated metadata. A log is a timestamped text report, either structured, recommended, or unstructured with metadata. While logs are an independent data source, they may also be attached to spans.

The Cloud Native Computing Foundation

Now let's talk about tools for monitoring. I believe in open source. I'm promoting standards in the industry. Most of the time, I will join the efforts that foster and sustain an ecosystem of open source projects or tools that implement standards, hence enters the CNCF, the Cloud Native Computing Foundation. The Cloud Native Computing Foundation seeks to drive adoption of technologies and techniques by fostering and sustaining an ecosystem of open source, vendor-neutral projects with technologies necessary to build and run scalable applications in modern, dynamic environments such as public, private, and hybrid clouds. For example, container, service meshes, microservices, immutable infrastructure, and declarative APIs, by focusing on techniques that enable loosely coupled systems to be resilient, manageable, and observable with robust automation. The goal is to allow engineers to make high impact changes frequently unpredictable with minimal tools.

One of the projects that is most famous from the CNCF as a graduated project is Kubernetes. Let's talk about scheduling and orchestration. In orchestration, probably you are using Kubernetes in your projects. It's an open source graduated project of the CNCF, mostly written in Go. In the CNCF, you will have all these really nice cards displaying what is the composition, where you can find the different projects, the license, everything. For example, in observability and analysis, we have all these tools available, OpenMetrics, Prometheus. Inside tracing, we have Zipkin, Jaeger, or OpenTelemetry. In logging, Grafana Loki is what Prometheus is for monitoring. Loki is for logging.

You probably have also encountered Prometheus in your own projects. This is an open source monitoring system developed by engineers at SoundCloud in 2012. It was the second project accepted in the CNCF foundation after Kubernetes and also the second one to graduate. The Prometheus monitoring system includes a rich multi-dimensional data model, a consistent powerful query language, an efficient embedded time-series database, and over 150 integrations with third party systems. My only word of advice is cardinality is key.

OpenMetrics

OpenMetrics creates an open standard for transmitting cloud native metrics at scale. It acts as an open standard from Prometheus. It was created in 2017. Since then, OpenMetrics has published a stable version 1.0, the specification that is used in production by many large enterprises: GitLab, DoorDash, Grafana Labs. OpenMetrics is primarily a wire format independent of any particular transport for that format. The format is expected to be consumed on a regular basis and to be meaningful over successive exposition. This standard expresses all system states as numerical values, counts, current values, enumeration, and Boolean states. Singular events occur in a specific time.

OpenTelemetry

OpenTelemetry is more than just a new way to visualize data across applications. This project aims to change how we use instrumentation without requiring a change in monitoring tools. It is a collection of tools and features designed to measure software performance. It is an amalgamation of two open source projects, OpenTracing and OpenCensus. The CNCF developed OpenTracing to provide a vendor agnostic standardized API for tracing. OpenCensus was the internal traceability platform from Google that later evolved into an open source standard. OpenTelemetry is an incubating project that combines the strength of both of these standards to form a unifying traceability standard that is both vendor and platform agnostic. It is now available for use across different platforms and environments. It provides APIs and SDKs among other tools to measure, collect telemetry data for distributed and cloud native application, and allow exporting the data to other visualization tools. If you go right now to the CNCF page, you will have the whole entire ecosystem of all the projects in each one of the categories.

Questions and Answers

Losio: I'm a quite old Java developer. I don't consider myself a Java developer anymore, because too many years that I don't write enough code to pretend to be a devoted Java developer. I definitely agree with you that the ecosystem in terms of tools and options for Java developers is definitely more mature than for other platforms. I was wondering if there's instead, anything that as a Java developer, actually, in the DevOps space is actually missing. Things that from other languages from other technology, you feel like, we're basically lagging behind.

Ruiz: There is really not a platform right now for the entire thing of our ecosystem, in the ecosystem of observability and monitoring. You actually need to pick and choose. That means that we still don't have a package, like use all these technologies, this is a sensible configuration, this will provide the most seamless integration between tools. That doesn't exist. We're still building that. It's not like we're lacking that in the Java developer only, I think we're lacking that in the entire development world, but we're running towards that.

Losio: You closed your presentation with that amazing slide with the full ecosystem. In one sense it's amazing, what is out there. On the other side is, as a developer, where should I start? Because if I attend this presentation, I feel amazing, I want to do more. One request that I will immediately have is, how? You mentioned many different tools, is there actually a list or something I think you can probably then action on that?

Ruiz: It all depends. I go to an organization and see their technology stack, there are tools that make more sense because they are covered in a broader aspect. Right now, we don't have the pre-selected menus that will work on x-j set cases. We still don't have that. That's something at the foundations level we're trying to do. On one side is create the standards so the vendors implement those standards, and you can migrate from one tool to another as painless as possible. On the other hand, we don't have the synergy. If you have decided to use Jaeger instead of Zipkin, what is the difference? How difficult is that going to be? Envoy. I'm using Envoy for the proxying on microservices. Things like that. It is more about somebody actually trying them together and saying this has lower impedance in the communication. It's a trial and fail kind of thing.

Losio: We all probably want to have a magic solution.

I'd actually like to go back to the beginning of your presentation where you present the results of the survey from last year. I found that really interesting what you say about the stagnation more or less of the number. What do you see as the main reason for that? For many years, the message I got is if you do DevOps, things are getting better. The results are there, you see numbers are better. Your downtime is lower. Your production is faster. You go live quicker. Everything is great. Why are people not doing it more? Because they're afraid, because they're lazy, or because actually you reach a barrier that you do a bit and then you don't take the next step? What are the things that are slowing down the adoption?

Ruiz: There are several reasons, one, as I said, there is no platform, still. Then people try and sometimes they fail a little bit, or there is a little bit of complex connecting all these applications. I have gone into different organizations and asked, who is involved in the DevOps culture more actively inside the teams? Nobody says me. Even us as developers, we started with the wrong foot, because we were building the software, and suddenly, from the top, they came and said, "Now you also need to take into consideration security. Now you also need to take into consideration your build process. Instead of using it externally, now, it's going to be a pipeline inside your code, and now you're responsible for this." Then, when we're saying about security, then we start using these tools like OWASP, or any bot, Dependabot, or security is Snyk, JFrog, whatever. Now we have hundreds of vulnerabilities and warnings, and you're like, do you want me to fix everything? Is that the message? Now I need to learn more tools. Now I need to have an overview of the entire process. Now you're telling me that I have to deploy it into pods, containers. Do I need to know that now? Suddenly, now I need to worry about cgroups, about different users. It's crazy. Many developers said, "I'm a developer. I know the DevOps. I don't want to go into that trip." Having said that, the problem of stagnation is, we are overwhelming a lot of our developers. Sometimes we don't have the platform set in our organization. It's too bumpy already. On top of that, inside the teams, because DevOps requires a lot of inter-collaboration between teams, and people are not sure about what are their roles and their needs, when you start talking about that.

Losio: It's pretty hard to choose what you need and how to do it. As you mentioned, it's pretty hard to do the next step. Is there any blueprint, for example, for the ecosystem, like any initial blueprints?

Ruiz: I can point you to several resources about success cases, like what's the technology that we use to migrate thousands of services? Which, they are. It is not a green future for us. There are some really good examples of good migrations, or very good DevOps stories. I cannot tell you, this is like the golden recipe, not even like three different menus. Because I belong to the CDF foundation, that is something that we are working on. Because it's not only me as a developer who feels overwhelmed, it's a lot of developers. We still cannot suggest something that is sound, complete, and that is annoying.

Losio: That's the pain. I was thinking as well in that sense about vendor-neutral projects. That's the sense of the entire idea. Can I take some shortcuts? If I'm using basically one cloud provider, or if I migrate into the cloud, how bad is it if I try, for my DevOps journey, let's say vendor lock-in, or use services that maybe are not vendor neutral, but will make my cloud adoption faster or quicker, or maybe previous knowledge of the team. Totally against it, or you see a point for it?

Ruiz: I see a point for it. Actually, I will tell you something that increases the complexity a little bit. For example, if you are already doing microservices and using cloud, you may want to have different vendors for some of your critical services. It's not even like you are trying to avoid vendor lock-in. Another level of complexity is being aware of the configuration between different cloud providers. Not only that, checking that all your configurations are safe, or well configured, or equally configured even between the two. Probably, people say to me, as a developer, you don't need to do that. That's totally Ops. Ops should take that into consideration. There are some things that will actually have to be changed or modified or exposed in a different way, when we are building our software. That's actually one of the benefits to the entire organization, because we need more knowledge, probably not in-depth knowledge. We are not going to be the ones that have the deployment keys or deployment roles, but our knowledge on the actual challenges that they face, will make us reconsider some of our architectural decisions or implementation strategy.

Losio: There's something really that fascinated me when you talked about shift left and all the security parts of DevOps. I noticed that in the last few years, in general, there are more on the cloud provider, a tendency towards machine learning, artificial intelligence service that basically I'm thinking about, I'm going to find your code security vulnerabilities using some machine learning. I can see that maybe they have not matured yet, but that's the direction. Do you think that's going to take place? There's going to be an overlap with machine learning as well in this area on the DevOps side or not?

Ruiz: I think it will. Static code analysis totally will benefit from figuring patterns faster, and what we define as code smells, trying to reduce it. Even what some of our IDEs are doing, like, this is repeated code, do you want to extract it? Things like that, I think we will benefit in the long run. Things that are really clear that we may improve either because of complexity of the code, or easy refactory things. We are already benefiting from it, maybe not full blown, but we are. I think machine learning there will help us a lot. You were mentioning about GitHub Copilot.

Losio: I was thinking that as well. First, I don't see it as you write the entire code, but I can see the appeal of start to see some code there, starting as a base. I don't know how it's going to fit for a demo.

Ruiz: Actually, I think in some places, it will be very beneficial. In others, it will start conversations but more about responsibility, authorship. I think it's going to be a good influence.

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Nov 24, 2022

Ixchel Ruiz

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Create PowerPoint Presentation in Java with Apache POI API

In our previous article, we introduced the Apache POI components for working with PowerPoint presentation files. We had a look at the HSLF (Horrible Slide Layout Format) and XSLF (XML Slide Layout Format) APIs offered by Apache POI. In this article, we’ll see how to create presentations in Java and save these as PPTX files .

System Requirements

Before you begin, make sure that your system meets the following requirements.

• JDK – Java SE 2 JDK 1.5 or above
• Memory – 1 GB Ram
• Operating System – Windows/ Linux/ Mac OS

Setting Up Development Environment for Apache POI

You’ll need a Java development environment such as Eclipse, IntelliJ IDEA, or any other IDE you’re comfortable with to work with the Apache POI library in your application. Next is to add Apache POI Maven dependency in your application’s pom.xml file as shown below.

Creating Empty Presentation in Java

Now that your development is ready, let’s dive into writing the code for creating our first blank PowerPoint Presentation.

When you open the saved file, you will see that the Presentation opens with Microsoft PowerPoint and doesn’t have any slides in it. This is the default behavior when creating a PowerPoint presentation with Apache POI.

Add Slides to PowerPoint Presentation in Java

The above code sample created an empty PowerPoint presentation without any slides. In order to create a new presentation with slides, use the createSlide method of the XMLSlideShow class as shown in the updated code sample below.

The createSlide method of the XMLSlideShow class is used to add a blank slide to the presentation. This method returns an object of the XSLFSlide class that can be further used to add content to the slide and work with its properties.

Apache POI components for working with PowerPoint presentation files let you create and edit PowerPoint PPT and PPTX files from within your Java application. In our upcoming blogs, we’ll further demonstrate the usage of Apache POI Java components for working with PowerPoint presentations. So, stay tuned.

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Java Development Company

Happy heap is a pioneer in java development with years of experience in building massive, scalable enterprise applications using java, spring, play and hibernate. – powerpoint ppt presentation.

• Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA), meaning that compiled Java code can run on all platforms that support Java without the need for recompilation. Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of computer architecture.
• One design goal of Java is portability, which means that programs written for the Java platform must run similarly on any combination of hardware and operating system with adequate runtime support.
• This is achieved by compiling the Java language code to an intermediate representation called Java bytecode, instead of directly to architecture-specific machine code.
• Java bytecode instructions are analogous to machine code, but they are intended to be executed by a virtual machine (VM) written specifically for the host hardware.
• End users commonly use a Java Runtime Environment (JRE) installed on their own machine for standalone Java applications, or in a web browser for Java applets.
• Java Development experts at Happy Heap have years of expertise in developing custom applications using the Java ecosystem. Our expertise is primarily in building enterprise scale applications using popular open source Java frameworks like Spring Framework Development and Play Framework Development.
• For persistence and interactions with a data store we have experience in building applications that use Hibernate to talk to a variety of relational databases like MySQL, Oracle, PostgresSQL. And also to NoSQL databases like MongoDB.
• We have implemented applications that use Elasticsearch or Solr Cloud for reading / searching through data. We have experience in building a full blown classifieds portal, a CRM system and also a distributed crawler using Java.
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• a. Newrelic.
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• Our team of DevOps specialists also have experience in configuring and deploying Java applications to production boxes using the best possible deployment architectures using Amazon Web Services.
• Being a mobile app development company means that our Java expertise rubs off in our native Android app development also.
• HappyHeap have considerable experience in configuring the Apache Tomcat servlet container to delivery Java applications. We can configure Tomcat behind Apache2 or a haproxy instance, we have run Tomcat behind a load balancer and without it also. Again our experience gives us the unique advantage of being able to debug performance issues with Apache Tomcat also.
• If you want to build a custom application using Java we are the right team for you, all the different capabilities required to make your next big Java project a success are available under one roof at Happy Heap. Get in touch with us to learn more.
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You might even have a presentation you’d like to share with others. If so, just upload it to PowerShow.com. We’ll convert it to an HTML5 slideshow that includes all the media types you’ve already added: audio, video, music, pictures, animations and transition effects. Then you can share it with your target audience as well as PowerShow.com’s millions of monthly visitors. And, again, it’s all free.

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Java Developer Roadmap 2023

Mar 01, 2023

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Roadmap for Java developers in 2023. Java is among the top programming languages in the software industry. Over 9 million software developers have chosen Java for their projects. With the continuous updates and increasing demand for Java over the years, itu2019s more likely for a new graduate to think of being a Java Developer. And thatu2019s absolutely normal. This blog will help you set the right path to becoming a Java Developer. So, without further ado, letu2019s get started!

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Java Developer Roadmap Java is among the top programming languages in the software industry. Over 9 million software developers have chosen Java for their projects. Read: Front-end Developer Roadmap 2023 With the continuous updates and increasing demand for Java over the years, it’s more likely for a new graduate to think of being a Java Developer. And that’s absolutely normal. Read: DevOps Engineer Roadmap for 2023 But do you know what the Java Developer position entails and what benefits you can gain by learning Java? Read: Software Architect Roadmap 2023 This blog will help you set the right path to becoming a Java Developer. So, without further ado, let’s get started!

Who is a Java Developer? A Java Developer is a specialized programmer responsible for performing tasks throughout the website, application, or software development lifecycle. The responsibilities of Java developers are as follows: ● Designing, implementing, developing, and maintaining Java applications ● Getting involved in architectural and software development activities ● Executing software coding, testing, analysis, and debugging ● Developing technical designs and documentation for web app development ● Converting requirements into prerequisites. ● Suggesting changes and modifications for improving the Java web app processes. Benefits of Java Now that we are well aware of the responsibilities of a Java developer, it’s time to look at the benefits Java entails. ● Tons of Resources to Learn From One of the major reasons behind the popularity of Java is the availability of numerous resources such as documentation, reference architectures, step-by-step videos, tutorial, training, certifications, etc. makes it easier to learn Java. ● Easy to Use If you have learned languages like C and C++ then learning and using Java is going to be easier for you. Java syntax is based on C++. However, unlike C and C++, Java uses garbage collection to remove unreferenced objects. Read: Structural Design Patterns in Java To make it easier to work with Java, features like operator overloading, explicit pointers, etc. have also been removed. ● Object-Oriented Being object-oriented, everything in Java is associated with objects and classes. OOP makes Java faster to execute; makes code easier to maintain, modify, and debug; offers a clear program structure; and helps in making a reusable application. Moreover, with OOP, Java becomes an extensible, system-modular, and flexible language. ● Robust Java comes with strong memory management and allows developers to handle exceptions, and use type-checking to make the code highly secured. Moreover, to avoid unwanted access in the memory, Java doesn’t provide explicit pointers as well. ● Multi-Threaded

Java can run multiple threads simultaneously. Multithreading is the program execution model allowing multi-threads to be created under the same process. While these threads will share the process resources they will run independently. ● Platform Independent Java intends to let programmers write once, and run anywhere (WORA). So, when we say Java is platform-independent, we refer to the fact that Java is independent of its byte code. When writing code in Java, it gets converted into Byte Code that can run on any operating system that supports Java without recompiling the code. ● Rich API System Java comes with a wide variety of APIs supported by the open-source ecosystem of Java. These APIs help in streamlining operating procedures and creating powerful web applications. ● Great Community Support With the continuously growing community of Java and over 9 million Java developers around the world, new developers get great support from experienced Java programmers through open forum platforms like StackOverflow. Roadmap to Become a Java Developer We have covered the basics that you needed to know before getting started with the Java Developer Roadmap. Now it’s time to help you set the path for you to be a Java Developer. Read: Blockchain Developer Roadmap 2023 ● Learn Data Structures and Algorithms Data structures and algorithms are the building blocks of any program that helps in storing data to be used efficiently. To become a Java developer, learning data structures like linked lists, arrays, hash tables, queues, stacks, binary trees, and graphs along with algorithms such as Sorting, Shuffling, Data Manipulation, binary search, Composition, etc. are a must. ● Gain General Programming Skills If you are looking to pursue a career in programming, it’s important to have skills like problem-solving, computer science fundamentals, HTTP/HTTPS protocol, design patterns, test and domain-driven development, and networking basics.

● Understand the Fundamentals Before getting a proficient Java programmer, its fundamental concepts including but not limited to basic syntax, conditionals, data variables, data types, loops, data structures, packages, OOP (classes, objects, and interfaces), exceptional handling, and working with files and APIs must be clear to you. ● Learn Advanced Concepts of Java After getting a better understanding of the basic concepts, you need to go a bit deeper and learn about working with JVM, memory management, collection frameworks, generics, streams, threads, garbage collection, serialization, and networking & sockets. ● Know About Build Tools A build tool is used to automate the processes of assembling, compiling, and deploying software. Using build tools, a developer can also handle dependencies, package management, and continuous integration. Some of the build tools that you can learn about are Maven, Ant, and Gradle. ● IDEs for Building Applications Integrated Development Environments (IDEs) are software that allows developers to build applications using common developer tools into a GUI. An IDE consists of local build automation tools, a source code editor, plugins, extensions, and a debugger. IntelliJ IDEA, NetBeans IDE, Eclipse, VS Code, etc are a few examples of IDEs among which you can choose one and learn to work with. ● Web Frameworks for Java Frameworks are the foundation/abstraction on which you can build your software applications without starting from scratch. Frameworks enhance both speed and quality of software development. Spring, Spring Boot, Spark, Play, Hibernate, Struts, and Vaddin are some of the frameworks that are used for developing Java applications. ● Learn Object-Relational Mapping (ORM) ORM is a technique in programming that is used to convert data between the heap and relational databases of an object-oriented programming language like Java. It allows developers to manipulate and query a database. Some of the ORM tools for Java that you can learn about are TopLink, Hibernate, OpenJPA, EBean, and MyBatis. ● Know How to Work with Java Development Kit (JDK) Java Development Kit is among the core technology packages for Java besides JRE and JVM. JDK is a software development package that provides the necessary tools and libraries for writing Java programs that can be run by the JVM and JRE. JDK includes an

interpreter, Java Runtime Environment, a compiler, a document generator, a jar, etc. You cannot work in Java without using JDK. Oracle JDK, Azul Systems Zing, IBM J9 JDK, OpenJDK, and Amazon Corretto are some of the popular JDK choices for Java developers. ● Work with Logging Frameworks To trace any error in the application, logging plays a crucial role. With logging frameworks, you get the ability to capture log files to record critical failures in the application. Log4J and Logback are two logging frameworks for Java that you can use. ● Understand Java Database Connectivity (JDBC) Java Database Connectivity is an API (application programming interface) that defines how a client can access a database to execute a query. And as a Java developer, it is essential to work with JDBC to create secure database access for the client. ● Know About Utility Libraries The power of Java lies in its environment of open-source libraries to do almost anything be it sending HTTP requests, logging into ML, or parsing JSON. Apache Commons, Guava, Logback, Jackson, GSON, JUnit, Apache Mina, and Eclipse Collection are a few Utility libraries that you must know about. ● Practice Secure Coding Making an application resilient to threats by identifying security vulnerabilities and fixing them is crucial to keep it safe from cyber attacks. To make your Java web app secure, you can use code analysis tools (PMD, SonarQube, FindBugs, etc.), follow OWASP security guidelines, and add authentication through OAuth, JWT, LDAP, and SAML. ● Don’t Forget to Test the Application A key to ensuring the application being developed meets the requirements of the client without compromising its speed and performance is testing. Running continuous tests with the development can help in creating high-performing and lower-regression code. Cucumber-JVM, Mockito, and JBehave are a few tools you can use to test the application. Takeaway That’s all about the Java Developer Roadmap. We hope you find the article resourceful to build your career in Java. While we tried to cover different aspects of Java programming, some areas have been still left untouched. So we encourage you to broaden your learning and practice every day not only with the tools and technologies mentioned here but also the ones that are about to emerge soon.

Besides, if you are a business owner looking to hire experienced Java Developers then get in touch with us now and get your customized quote!

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Bradley Witham - Java Application Developer

Bradley Witham expert in SDLC, Analysis, Design, Implementation, Testing and Deployment of IT projects using Java, J2EE in Banking domain & working in reputed company from last five year.

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António Oliveira - Senior Java Developer

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Hire Java Developer

Rapidsoft Technologies provide Best Java Programmers to solve your problems related to Software Development.

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How to become a Java developer and scope of Java developer? - Employment outlook

If you’re looking for an opportunity in the more technical and engineering jobs then Sulekha Jobs might be something you might want to look at.

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Best Java Developer - Hire Java Programmer Online

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Java Developer User Email List

If you are targeting Java customers for your marketing campaigns, then we have the best quality Java Customer List with full company and contact information, representing an opportunity to increase your revenue and customer base. This list is an excellent way to maintain contact with IT specialists who make use of Java software extensively. Our Java users list helps you in reaching your target market and increase your revenue, while bringing a better ROI. Java Developer User Email List, Java Developer List [email protected] http://www.globalb2bcontacts.com https://globalb2bcontacts.com/email-database.html

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Hire Dedicated Java Programmers - Hire Java Developer Online

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Hire Dedicated Java programmers & developers for web & software development projects. Our experienced Jave developers can help you to build scalable and cost effective Java-based solution within your budget. For More Info : https://www.alliancerecruitmentagency.com/hire-dedicated-java-developer/

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Hire Dedicated Java Programmer - Hire Java Developer Online

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Remote Java developer jobs

Remote Java developer jobs are here to stay. It is common to hear of these types of positions advertised in a lot of job sites, but you might find yourself wondering why theyu2019re in such high demand. When it comes to Java job listings, it is clear that the demand is going to be high for the foreseeable future.

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Affordable Java Developer Hire - Hire Java Programmer Online

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Hire Dedicated Java Developer - Hire Java Programmer Online

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Hire Dedicated Java Developer - Hire Java Programmers Online

Hire Java programmers & developers for web & software development projects. Our experienced hire dedicated Jave developer can help you to build scalable and cost effective Java-based solution within your budget.