This tutorial demonstrates how to install and configure Java 9 Beta on Eclipse Oxygen

This tutorial aims to help developers to test Java 9 features before the official release using the early access Java 9 build. The tutorial has been tested on Eclipse Oxygen 4.7.0 with JDK 9 build 181

1. Install Java 9 Early access build

Go to Java 9 download page and download the installer package

Download Java JDK 9

Run the executable, follow the steps and install Java 9

2. Install Eclipse Oxygen

Go to Eclipse download page and download “Eclipse IDE for Java Developers” or “Eclipse IDE for Java EE Developers”

Unarchive Eclipse

Note: You will require JDK 8 or previous version pre-installed on your System.

If Java 9 is the only java version you have installed – Eclipse will not start. You will find following error in eclipse log file:

eclipse.buildId=4.7.0.I20170612-0950
java.version=9
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product

!ENTRY org.eclipse.osgi 4 0 2017-09-08 12:17:02.768
!MESSAGE Application error
!STACK 1
org.eclipse.e4.core.di.InjectionException: java.lang.NoClassDefFoundError: javax/annotation/PostConstruct
	at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:410)
	at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:318)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:162)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createDefaultHeadlessContext(E4Application.java:491)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createDefaultContext(E4Application.java:505)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:204)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:614)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1472)
Caused by: java.lang.NoClassDefFoundError: javax/annotation/PostConstruct
	at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:124)
	at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:399)
	... 23 more
Caused by: java.lang.ClassNotFoundException: javax.annotation.PostConstruct cannot be found by org.eclipse.e4.core.di_1.6.100.v20170421-1418
	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:433)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:395)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:387)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:150)
	at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
	... 25 more

3. Add Java 9 Support for Eclipse

Got to Eclipse Marketplace and install Java 9 Support for Eclipse Oxygen by dragging the “Install” button to your running Eclipse window

Install Java 9 Support for Eclipse Oxygen

Restart Eclipse when prompted

4. Create a Java 9 Eclipse Project

Open Eclipse and go to File -> New -> Java Project

In “New Java Project Window” click on “Configure JREs…”

Eclipse new java project window

In “Installed JREs” window press the “Add…” button

Eclipse add new JRE

Select “Standard VM” and press “Next >” button

Eclipse select Standard VM

Under “JRE home” press the “Directory…” button, than browse and select your JRE 9 root directory. Note: If you select the JDK directory instead, you will not be able to build your projects

Select JRE 9 directory

Confirm by pressing the “Finish” button

Finish java 9 installation

Now select jre-9 in the list and apply the changes

Select java 9 as default JRE

Back in “Create a Java Project” window use the “Use an execution environment JRE” dropdown to select Java 9 for your new project

Select java 9 execution environment

Now you are ready to try some of the new Java 9 features

Many of the tutorials you will find here are based on the book Mastering Java 9 written by Dr. Edward Lavieri and Peter Verhas. This book will provide you with complete and deep understanding of the new Java 9 concepts and tools.