How to use Java version 15 in Eclipse 2020-09

Question

I'm trying to run the new Java 15 features under Eclipse 2020-09.

I have installed OpenJDK 15 and set it under "Installed JRE":

Nevertheless I cannot set this version as compiler version (only till version 14):

What am I doing wrong?

Answer 1

Eclipse needs a dedicated plugin to support Java 15.

This marketplace solution provides Java 15 support for Eclipse 2020-09 (4.17)