How to use Java version 15 in Eclipse 2020-09

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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":

installed jres

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

Compiler level

What am I doing wrong?

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Ori Marko On BEST ANSWER

Eclipse needs a dedicated plugin to support Java 15.

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