Neon: how to run on jdk9?

Question

Just started playing with jdk9 - and kind-of stuck right at the beginning:

• downloaded and extracted eclipse-java-neon-m4a-win32
• installed java 9 supp

Answer 1

I had the same issue. The NoClassDefFoundError shows when you select to build/compile your project with Java 9 JDK. Eclipse is unable to find a required jar file in root JDK folder, so it fails to start completely. After installing the Java 9 support plugin from the marketplace you may be able to start Eclipse, but still you will see a lot of errors and won't be able to compile a single project. The solution (for now) is to switch to Java 9 JRE in "Installed JREs" under "Project Preferences". This fixed everything for me

Taken from here, you may want to read the full article for more instructions