Java platform tools and technology

Java tools and technology help application developers build better code faster. Some Java tools are aimed at increasing the efficiency of applications running on the Java platform in terms of the computing and storage resources necessary to run the application. Other Java technologies are focused on making Java applications more maintainable via modularity and component reuse or other strategies. Still other tools and technologies are designed to make each application developer more effective by increasing communication (collaboration tools) or reducing the need for repetitive boilerplate code (high level abstractions and Java code libraries).

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Tutorial 06 Jan 2023
11 lessons learned from writing my first Java program

You'll be amazed how easy it is to learn Java and write powerful cross-platform applications when writing your first Java program. Some misconceptions about Java just aren't true. Continue Reading
Tutorial 29 Sep 2022
Your top 4 Java user input strategies

From System.in to the Scanner class, there are many ways to read user input into your Java programs. Find out which Java user input strategy is best for your software needs. Continue Reading

Tutorial 29 Sep 2022

Your top 4 Java user input strategies

From System.in to the Scanner class, there are many ways to read user input into your Java programs. Find out which Java user input strategy is best for your software needs. Continue Reading
Tutorial 29 Sep 2022

How Java's System.in reads input from the user

The Java System.in component provides universal access to console-based user input. Learn how to make your applications interactive with this Java System.in tutorial. Continue Reading
Blog Post 08 Aug 2022

How to use Java's conditional operator ?:

Quickly learn how to use the Java ternary operator and see how this simple programming construct can help make your conditional logic, if statements and return statements clearer and more concise. Continue Reading
Blog Post 07 Aug 2022

Java Scanner import

The easiest way to access the Java Scanner class is to import the java.util package into your code. But how exactly do you import the Java Scanner, and what exactly does it mean to import the ... Continue Reading
Blog Post 06 Aug 2022

How to use Java printf to format output

Learn by example how format output with the Java printf method. If you want to format dates, times, integers, doubles and Strings in the text you output to the console, logs or streams, you'll need ... Continue Reading
Blog Post 23 Jul 2022

Java Scanner String input example

Java's Scanner class provides a simple and effective way to handle user input. In this simple example, we show how to use Java's Scanner for String input with methods like next(), nextLine() and ... Continue Reading
Blog Post 12 Jul 2022

User input with Java's Console class

The Java Console class has greatly simplified user input in Java. The readLine method to get user input from the console, and the printf method for outpu, are way easier than using Java Scanner or ... Continue Reading
Blog Post 09 Jun 2022

How to run a Jar file

How do you run a JAR file on Windows, Mac or Linux? Double click the JAR? Run the JAR at the command line? Several approaches will work if you have Java or the JDK installed. Continue Reading
Blog Post 08 Jun 2022

'Java Not Recognized' Error Fix

Here are three easy ways to fix the 'Java not recognized as an external or external command' error on both Windows and Linux machines. Continue Reading
Blog Post 22 May 2022

Columns vs rows: What's the difference?

Learn the difference between columns vs rows, and learn how the use of rows and columns to organize objects and information in spreadsheets and tables has improved various fields from data ... Continue Reading
Blog Post 17 May 2022

How to setup an Apache reverse proxy server example

Most enterprise architectures use Apache as a reverse proxy, but it is not configured for that by default. In this quick tutorial, we show you how to configure an Apache reverse proxy for backend ... Continue Reading
Answer 18 Apr 2022

What are checked vs. unchecked exceptions in Java?

Understand the difference between checked and unchecked exceptions in Java, and learn how to handle these problem conditions properly and gracefully. Continue Reading
Tip 01 Apr 2022

7 tips to choose the right Java library

Your application is only as secure and reliable as the external libraries you use. Here's a list of the top 7 things to consider when choosing a software library for your project. Continue Reading
Tutorial 30 Mar 2022

An example of how suppressed exceptions in Java work

Don't ignore suppressed exceptions. In this quick tutorial we show you how to anticipate when code will throw suppressed exceptions, along with the best practices to handle them. Continue Reading
Tutorial 30 Mar 2022

A simple 'try with resources' in Java example

Java's 'try-with-resources' exception handling feature can help you write better, more effective Java code. Here's a quick example of the try with resources construct in action. Continue Reading
Quiz 21 Mar 2022

A tough, multiple choice Java exception handling quiz

Just how well do you know exception handling in Java? These 10 tough multiple-choice questions on checked and unchecked exceptions will test your error handling mettle. Continue Reading
Tip 16 Mar 2022

Fix these 10 common examples of the RuntimeException in Java

Don't let the occurrence of a RuntimeException in Java bring your code to a standstill. Here are 10 examples of how to avoid runtime exceptions in Java. Continue Reading
Tip 08 Mar 2022

Fix the 5 most common types of runtime errors in Java

The key to bug-free code is an awareness of the most common types of runtime errors in Java, along with the knowledge of how to avoid them. Continue Reading
Tutorial 11 Feb 2022

Fix the top 10 most common compile time errors in Java

Flummoxed why your Java code won't compile? Here are the 10 most commonly encountered Java compile errors, along with the fixes that will get your code working in no time. Continue Reading
Blog Post 08 Feb 2022

How to convert a PEM file to PPK format example

Need to SSH into a remote server with PuTTY but your PEM file just won do the trick? Here's a quick example of how to convert a PEM file to PPK format with PuTTYGen so your SSH sessions with PuTTY ... Continue Reading
Opinion 01 Feb 2022

5 tech trends that foretell the future of Java in 2022

Here's what 2022 has in store for developers, programmers and DevOps professionals who work in the server-side Java space. Continue Reading
Blog Post 25 Jan 2022

Why is the Bootstrap grid system 12 columns wide?

Ever wonder why they created a 12-column Bootstrap grid system, and not 10 or 15? It's the same reason there's 60 seconds in a minute, or 360 degrees in a circle. Continue Reading
Blog Post 31 Dec 2021

How to quickly change your branch in Git

These Git branch change examples will help you quickly address the specific version control challenge you are trying to solve, be it a branch renaming or a switch, list and checkout of existing ... Continue Reading
Blog Post 06 Dec 2021

Learn how Kubernetes Operators work from this example

Kubernetes (K8S) has become a very popular technology for working with distributed applications that run on the internet. K8S is intended to support an enormously large number of Linux containers ... Continue Reading
Blog Post 29 Nov 2021

Kubernetes vs Docker Compose: What's the difference?

Confused between the difference between Kubernetes and Docker compose? Here we explain how the two DevOps construct are similar, and how they are different. Continue Reading
Blog Post 29 Nov 2021

How to delete a Git repository

Trying to delete a local Git repository but the DVCS system still persists? Here's a quick example of how to locally remove a Git repo permanently and completely. Continue Reading
Blog Post 29 Nov 2021

How to use jarsigner to sign JARs files example

Here's a quick example of how to use Java's jarsigner to digitially sign JAR files. Continue Reading
Blog Post 29 Nov 2021

How to use Java's javap tool by example

Need to disassemble a Java class file? Want to look at the bytecode instructions generated from compiling source? These javap tool examples will show you how to use the javap command properly. Continue Reading
Blog Post 29 Nov 2021

How to import a Maven project from GitHub into Eclipse

Here's a quick tutorial that shows you how to import a GitHub hosted Maven project into the Eclipse IDE. Continue Reading
Blog Post 29 Nov 2021

What is the difference between Docker and containerd?

What's the difference between containerd and Docker? Here we take a look at how these two cloud-native Kubernetes friendly technologies differ and compare. Continue Reading
Blog Post 29 Nov 2021

What is the difference between kubectl and kubelet in Kubernetes?

Are you working in a cloud-native, Docker and Kubernetes based environment and you're wondering what the difference is between kubelet and kubectl? Here we clear up the kubectl vs kubelet confusion. Continue Reading
Tip 18 Nov 2021

Iterator vs. ListIterator: Which interface should you choose?

When the need exists to manipulate an ordered collection, the Java Iterator runs out of steam. Learn how Java's ListIterator improves upon the more generic Iterator interface. Continue Reading
Blog Post 31 Oct 2021

Uncommit Git's Last Commit Example

Need to do a git uncommit to the last commit you were working on? Learn how to quickly uncommit files updates and changes in Git. Continue Reading
Blog Post 28 Oct 2021

How to fully delete remote Git branches from GitHub

Learn the command to properly delete remote Git branches from tools such as GitHub and GitLab, while also deleting local remote tracking branches as well. Continue Reading
Blog Post 25 Oct 2021

Fix Git's "fatal: no upstream branch" error quickly example

Here's a quick fix for Git's "fatal: The current branch has no upstream branch" error, along with a brief explanation of why this happens when you push a new Git branch to GitHub, GitLab or BitBucket. Continue Reading
Blog Post 23 Oct 2021

How to discard your local changes in Git example

Don't let a file or two be overlooked when you attempt to remove and discard local, uncommitted changes in Git. Learn how to locally revert and remove uncommitted changes to files in Git properly. Continue Reading
Blog Post 22 Oct 2021

How to remove Git branches from your repository

Need to permanently remove a Git branch locally? What about the remote tracking branch? Or maybe someone removed a Git branch on GitHub or GitLab and you need to synchronize with the server? Here ... Continue Reading
Tip 14 Oct 2021

5 best Java 17 features that developers will love

The new Java 17 release contains plenty of new features that will intrigue developers. Here are five features that should push developers off the Java 11 LTS to JDK 17. Continue Reading
Blog Post 13 Oct 2021

How to rename and change a Git branch name locally & remotely

Here's a quick example that shows you how to rename a Git branch locally and remotely. The branch renaming commands and techniques will work with GitHub, GitLab, Bitbucket and any cloud based Git ... Continue Reading
Blog Post 11 Oct 2021

4 ways to create a Git branch quickly by example

Forgotten the Git branch create command? Here we'l show you four different ways to create a Git branch, be it from the current branch, from a tag or from a commit id. Continue Reading
Blog Post 03 Oct 2021

How to push new Git branches to remote repos on GitHub or GitLab by example

Did you create a new Git branch? Need to push that new Git branch to a remote repo such as GitHub or GitLab? This Git example tutorial shows you how to push new branches to remotes. Continue Reading
Blog Post 02 Oct 2021

Create a new Git branch with current local changes saved by example

Did you update some code in the wrong Git branch? Here's how to save those local changes in a newly created Git branch, and clean up the original branch in the process. Continue Reading
Tip 30 Sep 2021

3 simple Java Hello World examples

Are you a developer who's new to Java? Here are three ways to write a Hello World program in Java on Eclipse and get started with the popular programming language. Continue Reading
Feature 17 Sep 2021

5 reasons why Java is still the best programming language

Here's why Java is still the most popular programming language for everything from mobile development to enterprise and server-side applications that empower the middle tier. Continue Reading
Blog Post 14 Sep 2021

Every change between JDK 11 and the Java 17 LTS release

Wondering what's included in the new Java 17 LTS release? Here's a list of all the changes made to the JDK between the Java 11 and Java 17 LTS releases. Continue Reading
Feature 07 Sep 2021

Java Iterator vs. Enumeration: Why Iterator is the right call

Do you need to loop through a collection of objects and need to decide between a Java Iterator or an Enumeration? Here's why you should choose an Iterator almost every time. Continue Reading
Blog Post 31 Aug 2021

Docker versus Virtual Machines: Which DevOps tool is best?

Forced to choose between Docker and a virtual machine, which one should a developer choose. Here we compare and contrast the two DevOps tools and let you know which one is best to use. Continue Reading
Blog Post 31 Aug 2021

Fix GitHub's 'support for password authentication was removed' error

Frustrated by GitHub's 'support for password authentication was removed' error? Here's how to fix it by creating a personal access token in GitHub. Continue Reading
Guest Post 18 Aug 2021

The benefits and drawbacks of Java's fail-safe iterators

Iterators in Java are a simple mechanism to help developers avoid runtime exceptions. Let's explore the difference between fail-fast and fail-safe iterators. Continue Reading
Blog Post 01 Aug 2021

RPA examples that prove robotic automation works

Although Robotic Process Automation has been around for years, banks and financial institutions continue to find new RPA use cases to save time, effort and money. Continue Reading
Blog Post 20 Jul 2021

How to fork a Git repository

Looking for the fork command in Git? Well, it doesn’t exist. Here we'll show you how to fork a Git or GitHub repo on your own. Continue Reading
Blog Post 19 Jul 2021

How to download an older, specific version of UiPath Studio

Want to stop UiPath Studio from updating to the latest release all the time? Here's how to download and install a specific version of UiPath Studio. Continue Reading
Answer 16 Jul 2021

Kebab vs. camel case: How these naming conventions differ

What is the difference between a variable written in kebab case vs. camel case? Here we'll show you how these naming conventions differ and when to use one over the other. Continue Reading
Blog Post 02 Jul 2021

How to download and install UiPath Studio

It’s actually a bit tricky to install UiPath. This UiPath Studio install tutorial shows you how to find the download link and the right version. Continue Reading
Blog Post 30 Jun 2021

How to pass variables as UiPath arguments example

How do you use a variable from one UiPath sequence in another? This tutorial will teach you everything you need to know about passing data between workflows. Continue Reading
Blog Post 25 Jun 2021

UiPath If-Then conditional statements

Learn how to use the conditional UiPath If activity to create branches of logic in your RPA programs. This quick UiPath If-Then example will show you how. Continue Reading
Blog Post 20 Jun 2021

What is a Git fork? Meaning, definition and a Git Fork example

Need to fork GitHub at the command line? This quick Git tutorial will show you how to install the GitHub CLI tools and fork a repository in the shell. Continue Reading
Feature 17 May 2021

How developers can help build a diversified workforce

Diversity comes in many forms. One way to diversify your workforce is to find new applications for the unique skills developers bring to your organization. Continue Reading
Opinion 17 May 2021

How technologists should approach professional development

Old approaches to professional development don't stand up to the pace of change in the cloud-native world. Here's how DevOps professionals can cope. Continue Reading
Quiz 29 Apr 2021

Test your knowledge of Java foundations

Whether you're new to Java or have worked with the language for years, you need to know the foundational building blocks. Review the basics in this Java quiz. Continue Reading
Feature 12 Apr 2021

Incorporate diversity and inclusion in technology design

DEI in technology is about more than creating a diverse workplace. We talked to a few DEI professionals about how teams build tools with diversity and inclusion in mind. Continue Reading
Blog Post 30 Mar 2021

Recursion vs Iteration: What's the difference?

This Java recursion tutorial shows you how to create a recursive Java factorial function and compares these methods to iterative ones. Continue Reading
Blog Post 24 Mar 2021

Five examples of recursion in Java

We often debate the merits of iterative vs recursive Java code. Let’s take a look at 5 Java recursion examples and see where the concept of recursion fits. Continue Reading
Feature 19 Mar 2021

Java garbage collection interview questions and answers

From stop-the-world events to the impact of JVM pause times, these are the Java garbage collection questions and answers developers need to know before an interview. Continue Reading
Tutorial 18 Mar 2021

How to use Epsilon GC to stop Java garbage collection

The best way to stop Java garbage collection from happening is to use the experimental Epsilon GC, no-op garbage collector from JDK 11. Learn how and when to use it. Continue Reading
Quiz 26 Feb 2021

A tough, 10-question Java garbage collection quiz

Do you know which Java garbage collector is deprecated and which is best for stateless apps? Test your knowledge in this Java GC algorithm and tuning quiz. Continue Reading
Blog Post 26 Feb 2021

How to install Gitflow for Windows on old Git installations example

In some cases, Gitflow will come prepackaged with Git for Windows installations. Those on older installations will need do it manually. Here's a quick guide on how to perform a Gitflow install for ... Continue Reading
Blog Post 26 Feb 2021

Full Gitflow init workflow example

Here's a quick Gitflow init example, along with a quick tutorial on how to perform a full Gitflow workflow after you execute the command. Continue Reading
Blog Post 24 Feb 2021

Gitflow release branch process from start to finish example

The Gitflow release branch is the final step in this software development process workflow. Here we look at the start, finish and impact the Gitflow release has on the master, develop and feature ... Continue Reading
Blog Post 24 Feb 2021

Gitflow hotfix branch example from start to finish

If you’re lucky, you’ll never have to start the Gitflow hotfix process. But just in case, here’s a quick example of how to incorporate the Gitflow hotfix branch into your version control workflow. Continue Reading
Feature 11 Feb 2021

Use this Java performance tuning guide to optimize your JVM

There are two steps to Java performance tuning. First, assess your system to make sure it can improve. Then, optimize shared resources like CPU and memory. Continue Reading
Feature 29 Jan 2021

5 Java performance profiling tips to help tune your JVM

Check out these Java performance tips, such as which profiling tool to use, what data you need to save as part of your CI/CD pipeline and how to incorporate AI. Continue Reading
Blog Post 29 Jan 2021

Java Mission Control 8 Eclipse plugin install example

Here's a quick Java Mission Control tutorial to show you how to install the Java Mission Control Eclipse plugin and start a Java Flight Recorder JVM profile run. Continue Reading
Blog Post 29 Jan 2021

How to start Java's JVM Flight Recorder in 3 easy ways by example

JDK Mission Control is feckless without a Java Flight Recorder file to profile. Here are 3 easy ways you can start Java Flight Recorder in Eclipse and monitor your JVM in JMC. Continue Reading
Answer 27 Jan 2021

How do Java sampling and JVM instrumentation differ?

These two approaches both aim to improve Java performance and can be done together. But there is a fundamental difference between instrumentation and sampling. Continue Reading
Answer 27 Jan 2021

How to fix high Java CPU usage problems

The root cause of high Java CPU usage is not always simple to diagnose. Let's go over some common misdirections and review what often causes the problem under the hood. Continue Reading
Quiz 22 Jan 2021

Test your knowledge of JVM profiling tools with this quiz

Since their inclusion in Java 11, Java Flight Recorder and JDK Mission Control have become the de facto Java profiling tools for the JVM. Test your knowledge with these 10 questions. Continue Reading
Answer 19 Jan 2021

JVM tuning vs. Java optimization: What's the difference?

JVM tuning and Java optimization sound similar, and both aim to boost application performance. But they take fundamentally different approaches to accomplish their goals. Continue Reading
Video 15 Jan 2021

5 ways to force Java garbage collection

A developer can't technically force garbage collection in Java, but it can be made a priority. If you need to free up heap space, here are five ways to prioritize it in the JVM. Continue Reading
Blog Post 29 Dec 2020

Performance cost of autoboxing Java primitive types explained

The boxing and unboxing of Java primitive types has severe performance implications. Uncover the truth about autoboxing Java primitive types in this JDK Mission Control and JVM Flight Recorder example. Continue Reading
Blog Post 23 Dec 2020

How to run Jenkins on AWS by example

Need to run Jenkins on AWS? It's not a bad idea, especially when developers consider the need for a CI/CD server to integrate with peripheral resources. This quick example shows you the easiest way ... Continue Reading
Blog Post 07 Nov 2020

Find Jenkins Home and change the JENKINS_HOME directory location by example

How to change JENKINS_HOME When Jenkins runs, it stuffs all of its logs, cloned repos, plugin configurations and build artifacts into the Jenkins Home folder. Basically, every ounce of ... Continue Reading
Blog Post 02 Nov 2020

Use Jenkins' Warning plugin for CheckStlye, PMD and FindBugs reports example

The Jenkins Warnings plugin replaces the deprecated CheckStyle, FindBugs and PMD ones. This static code analysis in Jenkins example shows you how to integrate Jenkins, CheckStyle, FindBugs and PMD ... Continue Reading
Blog Post 31 Oct 2020

Fix the Jenkins error: Invalid agent type Docker specified [any, label, none]

Here's how to quickly fix the "Invalid agent type Docker specified. Must be one of [any, label, none]" error by installing the correct Jenkins Docker pipeline plugins. We'll get your Jenkinsfile up ... Continue Reading
Answer 27 Oct 2020

How can I become an AWS Authorized Instructor?

To become an AWS Authorized Instructor, you need deep knowledge of Amazon products and services and must be able to communicate this wealth of technical information. Continue Reading
Feature 12 Oct 2020

5 helpful tips to reduce webpage load time, improve performance

Nobody wants to wait for a webpage to load. Follow these tips to reduce website load time and improve the user experience for a better online persona. Continue Reading
Blog Post 21 Sep 2020

AI, RPA offerings still stymied by security, governance concerns

Security, compliance and governance concerns along with human worries still play a role in the integration of AI-based and RPA offerings to an enterprise. Here are some ways to alleviate those ... Continue Reading
Blog Post 13 Sep 2020

Use .gitkeep to commit & push an empty Git folder or directory

What is the .gitkeep file? How do you commit and push empty Git folders? In this quick tutorial we'll explain why git is not pushing empty folders and how to fix it. Continue Reading
Blog Post 13 Sep 2020

Create your first RPA robot in UiPath Orchestrator

After your RPA program is coded, you will need to create a robot in UiPath Orcestrator so the robotic automation can me managed. This UiPath robot creation tutorial shows you how to do exactly that. Continue Reading
Blog Post 05 Aug 2020

Fix "There isn't an Orchestrator present" error with the right UiPath Orchestrator URL

Is the UiPath Assistant complaining that the UiPath Orchestrator URL is wrong? Here's how to fix the UiPath Orchestrator present at the indicated URL error. Continue Reading
Blog Post 28 Jul 2020

How AI can help with requirements analysis tools

Functional requirements and user stories create the blueprint for software applications. A good set of requirements can simplify developer's work when they translate business ideas into working ... Continue Reading
Podcast 27 Jul 2020

How Quarkus fits into the Red Hat Runtimes formula

Faster microservices runtimes are the center of the excitement around Quarkus. Hear what Red Hat's James Falkner thinks about the framework in this podcast with TheServerSide.com. Continue Reading
Blog Post 27 Jun 2020

How to publish to UiPath Orchestrator example

UiPath Orchestrator runs in the cloud. UiPath Studio runs on a developer's desktop or laptop. And RPA robots typically run on a physical desktop computer as well. Which means a piece of software ... Continue Reading
Blog Post 25 Jun 2020

Make this UiPath Hello World example the first project in your RPA journey

The first step in every RPA journey must be the creation of a Hello World robot. In this UiPath Hello World example, we step you through the creation of your first automation app. Continue Reading
Blog Post 02 Jun 2020

Fix for the GitLab "Unable to locate package gitlab-ee" on Ubuntu 20

If you're doing a self-hosted GitLab Ubuntu 20 install and you hit the "Unable to locate package gitlab-ee" error, here's the solution to fix the problem. Continue Reading
Blog Post 01 Jun 2020

Where system, global and local Git config files on Windows and Ubuntu Linux are

Ubuntu, Linux and Windows Git configuration files are an unwieldy mess. Or at least is seems that way when you realize it's contained in three uniquely named files and spread across three or four ... Continue Reading
Blog Post 01 Jun 2020

How to create a UiPath trigger to schedule robotic processes automation

How do you schedule UiPath trigger? Time based and queue based are the two ways to run uattended UiPath robots. In UiPath time trigger example we demonstrate the former. Continue Reading
Video 27 May 2020

HashMap vs. Hashtable: Which map should you choose?

When HashMap replaced Hashtable as part of the Java 1.2 release, it moved away from how developers previously used the collections API and Java maps. Continue Reading
News 07 May 2020

Oracle's Project Leyden uses static images to ease Java pain

Oracle's new Project Leyden introduces static images to help ease long-standing Java language shortcomings such as slow startup times and unwieldy footprints. Continue Reading
Tip 25 Mar 2020

How to refactor the God object class antipattern

Loose coupling can inadvertently create a God object problem in an object-oriented software system. Here's how to get rid of the issue and simplify the design in five easy steps. Continue Reading