Eclipse – “Incompatible JVM. Version 1.8.0_261 of the JVM is not suitable for this product. Version: 11 or greater is required”

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The Java to run Eclipse can be specified in the eclipse.ini file (see Eclipse wiki: eclipse.ini – Specifying the JVM). Add the following two lines directly before the line -vmargs and adapt the path to your Java 11 or higher 64-bit Java VM installation directory:

-vm
C:\Program Files\AdoptOpenJDK\jdk-14.0.2.12-openj9\bin\javaw.exe

Alternatively, you can put the Java VM into the jre subdirectory of the Eclipse installation or, if you do not install Eclipse but upgrade it, install Java 11 or better Java 14 as plugin before the upgrade from Eclipse JustJ (use JustJ OpenJDK Hotspot JRE Complete, not Base or Minimal).

Please note, that even if you run Eclipse with Java 11 or higher, Eclipse 2020-09 (4.17) still supports to code in Java 14, 13, 12, 11, 10, 9, 8 and even much older versions (down to Java 1.1). Java 15 can be installed via Marketplace.

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