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1. Go to Window -> Preferences -> Java -> Installed JREs and Add and select the above version. If you want to find a regression or backport, you can switch to earlier versions here (will require rebuilding). You might see a warning that Eclipse does not support this Java version, this should not cause issues.
2. Go to Window -> Preferences -> Java -> Compiler and set the compiler compliance level to the latest (you . You might not have an option for an unreleased version of Java). For Java 11If compliance level 11 is not available, install the patch from the update site: http://download.eclipse.org/eclipse/updates/4.9-P-builds/.

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