JDT Core/Java8

This page summarizes the work that is being done to add Java™ 8 support into Eclipse. As of now JSR 335 (Lambda expressions) and JSR 308 (Type annotations) are being planned

Java 8 features that are being worked on

• JSR 335 [Lambda expressions] + [Default Methods]
• JSR 308 [Type annotations]

What needs to be done

• TO BE FILLED

Current status

Updates are filed in the top level bug [380190 - Add support for Java SE 8]

JDT UI changes are tracked in JDT UI/Java8

IMPORTANT NOTE

• The following lines must be added in all headers of modified files for Java™ 8 implementation:

 * This is an implementation of an early-draft specification developed under the Java
 * Community Process (JCP) and is made available for testing and evaluation purposes
 * only. The code is not compatible with any specification of the JCP.
 *

• Use the following @since tag on all newly added members: "3.9 BETA_JAVA8"

What to do to set up the IDE

• Checkout the BETA_JAVA8 branch of the following git repositories:
  • JDT/Core repository - git://git.eclipse.org/gitroot/jdt/eclipse.jdt.core.git

• You need to install a JDK8 build as an installed JRE in order to run the tests using the JavaSE-1.8 Execution Environment.

• For more information on how to work with git repositories, look at http://wiki.eclipse.org/Platform-releng/Git_Workflows .

• As API Baseline, use 3.8 (or 3.8 RC4 until 3.8 is released).

Configure a project to use Java 8 features

Because JDT/UI does not yet offer the options to configure a project for Java 8, any projects wishing to use Java 8 features should be manually configured by ensuring these lines in <project>/.settings/org.eclipse.jdt.core.prefs:

org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
org.eclipse.jdt.core.compiler.compliance=1.8
org.eclipse.jdt.core.compiler.source=1.8

Disclaimer

This is a work in progress. The contents of the BETA_JAVA8 branch will be updated as the changes are made to the JSR Specification.

If you need any help with this, please contact the JDT/Core team through either the forum or Bugzilla.