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When changing the default Java compiler compliance to 1.8, then next time Eclipse starts, it is set to 1.4. Environment: Eclipse 2020-12 (Eclipse IDE for Enterprise Java Developers); Linux Mint 20.1 # Steps to recreate - Create a new workspace for Eclipse 2020-12 - Open Window=>Preferences=>Java=>Compiler - Change the compliance level from 11 to 1.8. - (Note that the 1.8 setting remains in effect while Eclipse remains open) - Restart Eclipse - The same setting now shows 1.4 instead of 1.8 - Changing it again to 1.8 still results in a setting of 1.4 on the next restart. # Impact Unfortunately, some of the projects I work on use a shared .project file which I have no control over. In these cases, the Java compiler compliance level must be set at the workspace level rather than the project level. To work, I must now remember to change the workspace compliance level to 1.8 every single time I start Eclipse. # Other things I tried In monitoring `.metadata/.plugins/org.eclipse.core.runtime/.settings/org.eclipse.jdt.core.prefs`, I can see that the correct settings are set when I hit the "Apply" button in the preferences window: ``` eclipse.preferences.version=1 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve org.eclipse.jdt.core.compiler.compliance=1.8 org.eclipse.jdt.core.compiler.debug.lineNumber=generate org.eclipse.jdt.core.compiler.debug.localVariable=generate org.eclipse.jdt.core.compiler.debug.sourceFile=generate org.eclipse.jdt.core.compiler.problem.assertIdentifier=error org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled org.eclipse.jdt.core.compiler.problem.enumIdentifier=error org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning org.eclipse.jdt.core.compiler.release=enabled org.eclipse.jdt.core.compiler.source=1.8 ``` These remain as above when I close Eclipse. Upon restarting Eclipse, `org.eclipse.jdt.core.prefs` changes to the following: ``` eclipse.preferences.version=1 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.2 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve org.eclipse.jdt.core.compiler.compliance=1.4 org.eclipse.jdt.core.compiler.debug.lineNumber=generate org.eclipse.jdt.core.compiler.debug.localVariable=generate org.eclipse.jdt.core.compiler.debug.sourceFile=generate org.eclipse.jdt.core.compiler.problem.assertIdentifier=warning org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled org.eclipse.jdt.core.compiler.problem.enumIdentifier=warning org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning org.eclipse.jdt.core.compiler.release=enabled org.eclipse.jdt.core.compiler.source=1.3 ```
Are you using Oomph?
It's a new workspace, so I did not imagine there to be any Oomph settings, but I appear to have been mistaken. The Oomph recorder is disabled. I signed out of Eclipse User Storage, disabled "Synchronize with Eclipse.org" under Preference Synchronizer, and both cleared caches and cleaned up the Bundle Pools. None of these made any difference. However, enabling "Skip automatic task execution at startup time" under the Oomph Setup Tasks appears to have solved the problem. In the end, I wiped my .eclipse directory and that was effective in solving the problem for all newly created workspaces as well. I must have toyed with Oomph in the past without having a good understanding of exactly what it is doing. I do not find it to be either intuitive or obvious. Apologies for this not-a-bug.
