Eclipse Java Jdk

Eclipse is just one of the numerous script editing applications for developing java programs and allows students to write and compile java code and execute programs. Since Eclipse is one of the most used IDE for developing the Java program, so probably you would like to use Eclipse for learning the new features of JDK 8. So, this tutorial is everyone who wants to learn the JDK. We have created a video which shows you the process of installing the Eclipse plugin for adding the JDK 8 support to the Eclipse Luna. IMPORTANT: Install Java first, BEFORE you install Eclipse. The following instructions were composed for installing Sun Java 1.5.008 (aka JDK 5.0 update 8). This may not be the latest version, but it is the one that we are using this semester. Note: Java is already installed as part of Mac OS X, so no further installation is necessary for. Use png with transparent icon in the about dialog of Java EPP (and others if applicable) NEW: 530698: Using weka api: NEW: 526611: win64 version missing: NEW: 498457: FileNotFoundException: org.eclipse.ui3.108.0.v201.jar: NEW: 489296: Improve out-of-box experience for non-english locales: NEW: 386806: New Eclipse Icon not used.

1. Overview

The Eclipse IDE is one of the most common tools for Java application development. It comes with default settings that enable us to build and execute our code right away within the IDE.

However, these default settings are sometimes not sufficient when we try to build using Maven in Eclipse. Consequently, we'll encounter build errors.

In this quick tutorial, we'll demonstrate the configuration changes we need to make so that we can build Maven-based Java projects within the IDE.

2. Java Compilation in Eclipse

Gaijin entertainment twitter. Before we start, let's try to understand a little bit about the compilation process in Eclipse.

The Eclipse IDE comes bundled with its own Java compiler called Eclipse Compiler for Java (ECJ). This is an incremental compiler that can compile only the modified files instead of having to always compile the entire application.

This capability makes it possible for code changes that we make through the IDE to be compiled and checked for errors instantaneously as we type.

Due to the usage of Eclipse's internal Java compiler, we don't need to have a JDK installed in our system for Eclipse to work.

3. Compiling Maven Projects in Eclipse

The Maven build tool helps us to automate our software build process, and Eclipse comes bundled with Maven as a plugin. However, Maven doesn't come bundled with any Java compilers. Instead, it expects that we have the JDK installed.

To see what happens when we try to build a Maven project inside Eclipse, assuming that Eclipse has the default settings, let's open any Maven project in Eclipse.

Then, from the Package Explorer window, let's right-click on the project folder and then left-click on Run As > 3 Maven build:

Eclipse java jdk

This will trigger the Maven build process. As expected, we'll get a failure:

The error message indicates that Maven is unable to find the Java compiler, which comes only with a JDK and not with a JRE.

4. JDK Configuration in Eclipse

Let's now fix the Maven build issue in Eclipse.

First, we need to download the latest version of JDK and install it in our system.

After that, let's add the JDK as a runtime in Eclipse by navigating to Window > Preferences > Java > Installed JREs:

Eclipse Jdk Version

We can see that Eclipse already has Java configured. However, this is the JRE and not the JDK so let's proceed with the next steps.

Now, let's click on the Add… button to invoke the Add JRE wizard. This will ask us to select the type of JRE.

Here, we've selected the default option, Standard VM:


Clicking on Next will take us to the window where we'll specify the location of the JRE home as the home directory of our JDK installation.

Following this, the wizard will validate the path and fetch the other details:

Eclipse for java jdk

We can now click on Finish to close the wizard.

This will bring us back to the Installed JREs window, where we can see our newly added JDK and select it as our runtime in Eclipse:

Let's click on Apply and Close to save our changes.

5. Testing the JDK Configuration

Let's now trigger the Maven build one more time, in the same way as before.

We can see that it's successful:

Eclipse Set Jdk

6. Conclusion

In this tutorial, we saw how we could configure Eclipse for Maven builds to work within the IDE.

By doing this one-time configuration, we're able to leverage the IDE itself for our builds without having to set up Maven externally.

Get started with Spring 5 and Spring Boot 2, through the Learn Spring course:

Written by Nam Ha Minh
Last Updated on 04 October 2019 Print Email
In this article, I will guide you how to change JDK/JRE that runs Eclipse IDE, on Windows operating system. First, you need to know exactly which version of Java on which Eclipse is running.

1. Find the JDK / JRE that runs Eclipse

In Eclipse, click menu Help > About Eclipse IDE

How To Import A Jdk In Eclipse

. Then in the About Eclipse IDE dialog, click the Installation Details button. Then in the next screen, click Configuration tab. Wait for a moment while Eclipse is retrieving configuration information, and you will see a screen as below:Find the line that starts with –vm and the value in the next line shows the exact path of JDK/JRE on which Eclipse is running. In the above screenshot, you see Eclipse is running on OpenJDK 11.0.2.

2. How to Change JDK / JRE for Eclipse

You know, Eclipse IDE is written in Java so it needs a JDK/JRE installed to run. By default, the first instance of JDK/JRE found in the PATHenvironment variable is used to run Eclipse. Consider a typical value of the PATHenvironment variable like this:In this case, the Java Virtual Machine found in the JAVA_HOME path will run Eclipse IDE. So changing the Java version that run Eclipse is just a matter of updating the value of the JAVA_HOME variable.However, sometimes it doesn’t work like that. You changed JAVA_HOME points to a newer JDK/JRE, but Eclipse still runs under the old one. Why? What happens?There are two reasons:
  • An installation of Oracle Java putting its path before your JAVA_HOME, or
  • Your Eclipse IDE is configured to stick with a JDK/JRE in its configuration file.

Let me show you how to change JDK/JRE for Eclipse in both cases.Edit the PATH environment variable on Windows, and you may see a screen as below:Here, an installation of Oracle Java puts the following line before your JAVA_HOME:That means the JDK/JRE found in this path is always used to run Eclipse. Your JAVA_HOME is ignored. So to change, just move your JAVA_HOME before Oracle’s javapath using the Move Up and Move Down buttons; or delete that Oracle’s javapath. Then restart Eclipse and check configuration again to make sure Eclipse is actually running on the JDK/JRE you specified.If that doesn’t work, it’s very likely that your Eclipse is somehow configured to stick with a specific version of Java Virtual Machine in its configuration file.Open the eclipse.ini file in Eclipse’s installation directory in a text editor like Notepad. You may see something like this:Now, you can change the path after the –vm line to point to a different path of JDK, or delete these two lines to use the Java version specified in the Eclipse java jdk downloadPATH system environment variable.Phew! That’s how to change the version of Java virtual machine that powers your Eclipse IDE. I hope you found this article helpful.You can also watch the video version below:Eclipse

Other Eclipse Tutorials:

About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.