Reindexing local Maven Repo in fresh Eclipse install fails with java.nio.channels.OverlappingFileLockException

Issue

Having a completely fresh install of Eclipse for EE Version: 2020-12 (4.18.0) on Win10 whenever I try to reindex it via the preferences dialog I get the following error:

Reindexing error
java.nio.channels.OverlappingFileLockException

I already tried:

• moving the Maven repo to a fresh and/or empty location
• starting with a fresh eclipse install and fresh workspace folder
• restarting the system and installing a fresh eclipse, eclipse workspace and maven repo

Any ideas on what to check or where to look besides doing a full reinstall of the OS would be greatly appreciated.

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Here is the full Stack trace for the error from the m2e log (as requested by @nitind ):

2021-03-02 16:02:18,461 [Worker-10: Indexing Local Repository...] ERROR o.e.m.c.i.i.nexus.NexusIndexManager - Unable to re-index workspace://
java.nio.channels.OverlappingFileLockException: null
    at java.base/sun.nio.ch.FileLockTable.checkList(FileLockTable.java:229)
    at java.base/sun.nio.ch.FileLockTable.add(FileLockTable.java:123)
    at java.base/sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:1297)
    at java.base/java.nio.channels.FileChannel.tryLock(FileChannel.java:1178)
    at org.apache.maven.index.context.DefaultIndexingContext.unlockForcibly(DefaultIndexingContext.java:927)
    at org.apache.maven.index.context.DefaultIndexingContext.prepareIndex(DefaultIndexingContext.java:244)
    at org.apache.maven.index.context.DefaultIndexingContext.purge(DefaultIndexingContext.java:612)
    at org.eclipse.m2e.core.internal.index.nexus.NexusIndexManager.purgeCurrentIndex(NexusIndexManager.java:529)
    at org.eclipse.m2e.core.internal.index.nexus.NexusIndexManager.reindexWorkspace(NexusIndexManager.java:561)
    at org.eclipse.m2e.core.internal.index.nexus.NexusIndexManager.updateIndex(NexusIndexManager.java:1072)
    at org.eclipse.m2e.core.internal.index.nexus.NexusIndex.updateIndex(NexusIndex.java:147)
    at org.eclipse.m2e.core.ui.internal.preferences.MavenSettingsPreferencePage$2.runInWorkspace(MavenSettingsPreferencePage.java:263)
    at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:42)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Solution

The problem was finally resolved by removing the system variable for M2_HOME that was pointing at an additional Maven installation on the system.

Eclipse seems to invoke this 2nd one during the reindexing operation thus leading to the OverlappingFileLockException.

Answered By - FrozenSUSHI