JDK 9 Outreach (DRAFT)

Introduction

With JDK 9 development underway in the OpenJDK Community, and based on our experiences with open source projects testing against JDK 9 Early Access builds in the Quality Outreach effort, it seems like a good idea to compile the accumulated wisdom to make it easier for new projects to start testing against JDK 9.

Caveat Lector

JDK 9 has not been released yet. That means the tips and suggestions accumulated here should not be taken as the final word on how to adjust your code for JDK 9 as some things may (and probably will) change as the set of JEPs targeted for JDK 9 changes. If in doubt, ask - preferably on the adoption-discuss mailing list.

The Little Things

Before you get started testing your code against JDK 9, there are a few little things to consider.

JDK 9 Builds

You can build JDK 9 yourself by following the build instructions to build the OpenJDK source code in the jdk9/jdk9 forest. Please check the list of supported build platforms to verify that your build platform is supported before you attempt building JDK 9 from source yourself.

JDK 9 Early Access builds might also be provided by third parties. Oracle publishes regular JDK 9 builds at http://jdk9.java.net, for example.

Removed support for deprecated VM flags

The Tools

Changes foreshadowed by the JEPs