Migrating from Java 21 to Java 25

Support for OpenJDK 25 was added in Eclipse OpenJ9™ version 0.55.0.

The following new OpenJ9 changes apply when OpenJ9 is built with Java® SE 25 class libraries. This information exists elsewhere in the documentation but is summarized here for convenience.

Support for JDK enhancement proposals (JEP)

The new JEPs that are supported are listed in the following topics:

• JDK 22: What's new in version 0.45.0
• JDK 23: What's new in version 0.47.0
• JDK 24: What's new in version 0.54.0
• JDK 25: What's new in version 0.55.0

New OpenJ9 features and changes

There are no new JDK 25 version specific OpenJ9 features or notable changes up to the 0.55.0 release.