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java.lang.NullPointerException at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:2533) at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:2523) at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:2509) at org.sonatype.nexus.index.context.DefaultIndexingContext.rebuildGroups(DefaultIndexingContext.java:710) at org.sonatype.nexus.index.DefaultNexusIndexer.rebuildGroups(DefaultNexusIndexer.java:341) at org.sonatype.nexus.index.DefaultIndexerManager.mergeRepositoryGroupIndexWithMember(DefaultIndexerManager.java:811) at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:750) at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:686) at org.sonatype.nexus.DefaultNexus.reindexRepository(DefaultNexus.java:1399) at org.sonatype.nexus.tasks.ReindexTask.doRun(ReindexTask.java:47) at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:147) at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:345) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619)