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java.lang.IllegalMonitorStateException: null at java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared(ReentrantReadWriteLock.java:363)[na:1.6.0_24] at java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared(AbstractQueuedSynchronizer.java:1317)[na:1.6.0_24] at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock(ReentrantReadWriteLock.java:745)[na:1.6.0_24] at org.apache.maven.index.context.DefaultIndexingContext.unlock(DefaultIndexingContext.java:193)[na:na] at org.apache.maven.index.context.MergedIndexingContext.unlock(MergedIndexingContext.java:270)[na:na] at org.apache.maven.index.packer.DefaultIndexPacker.packIndex(DefaultIndexPacker.java:212)[na:na] at org.sonatype.nexus.index.DefaultIndexerManager.publishRepositoryIndex(DefaultIndexerManager.java:1281)[na:na] at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:842)[na:na] at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:812)[na:na] at org.sonatype.nexus.tasks.ReindexTaskHandlerLegacy.reindexRepository(ReindexTaskHandlerLegacy.java:54)[na:na] at org.sonatype.nexus.tasks.AbstractIndexerTask.doRun(AbstractIndexerTask.java:69)[na:na] at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:158)[nexus-app-2.1.jar:na] at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:459)[plexus-task-scheduler-1.6.0.jar:na] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)[na:1.6.0_24] at java.util.concurrent.FutureTask.run(FutureTask.java:138)[na:1.6.0_24] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)[na:1.6.0_24] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)[na:1.6.0_24] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)[na:1.6.0_24] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)[na:1.6.0_24] at java.lang.Thread.run(Thread.java:662)[na:1.6.0_24]