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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 will might not have an option for an unreleased version of Java). For Java 11, install the patch from the update site: http://download.eclipse.org/eclipse/updates/4.9-P-builds/.

Building the workspace can take some time. However, thanks to Eclipse's incremental compiler, you do not need to rebuild all of it on every change.

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