Concurrent modification exception in system feeds

2011-01-07 13:46:21 WARN  [st-1-thread-175] - org.sonatype.nexus.events.DefaultEventInspectorHost - EventInspector implementation='org.sonatype.nexus.events.ItemChangesFeedEventInspector' had problem inspecting an event='class org.sonatype.nexus.proxy.events.RepositoryItemEventCache'
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
        at java.util.HashMap$EntryIterator.next(HashMap.java:834)        at java.util.HashMap$EntryIterator.next(HashMap.java:832)
        at java.util.HashMap.putAll(HashMap.java:523)
        at org.sonatype.nexus.proxy.RequestContext.flatten(RequestContext.java:373)
        at org.sonatype.nexus.feeds.AbstractEvent.addEventContext(AbstractEvent.java:66)
        at org.sonatype.nexus.events.ItemChangesFeedEventInspector.inspectForNexus(ItemChangesFeedEventInspector.java:105)
        at org.sonatype.nexus.events.ItemChangesFeedEventInspector.inspect(ItemChangesFeedEventInspector.java:58)
        at org.sonatype.nexus.events.DefaultEventInspectorHost$EventInspectorHandler.run(DefaultEventInspectorHost.java:157)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:680)
2011-01-07 13:47:11 WARN  [st-1-thread-173] - org.sonatype.nexus.events.DefaultEventInspectorHost - EventInspector implementation='org.sonatype.nexus
.events.ItemChangesFeedEventInspector' had problem inspecting an event='class org.sonatype.nexus.proxy.events.RepositoryItemEventCache'
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
        at java.util.HashMap$EntryIterator.next(HashMap.java:834)        at java.util.HashMap$EntryIterator.next(HashMap.java:832)
        at java.util.HashMap.putAll(HashMap.java:523)
        at org.sonatype.nexus.proxy.RequestContext.flatten(RequestContext.java:373)
        at org.sonatype.nexus.feeds.AbstractEvent.addEventContext(AbstractEvent.java:66)
        at org.sonatype.nexus.events.ItemChangesFeedEventInspector.inspectForNexus(ItemChangesFeedEventInspector.java:105)
        at org.sonatype.nexus.events.ItemChangesFeedEventInspector.inspect(ItemChangesFeedEventInspector.java:58)
        at org.sonatype.nexus.events.DefaultEventInspectorHost$EventInspectorHandler.run(DefaultEventInspectorHost.java:157)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:680)
2011-01-07 13:47:30 WARN  [st-1-thread-173] - org.sonatype.nexus.events.DefaultEventInspectorHost - EventInspector implementation='org.sonatype.nexus
.events.ItemChangesFeedEventInspector' had problem inspecting an event='class org.sonatype.nexus.proxy.events.RepositoryItemEventCache'
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
        at java.util.HashMap$EntryIterator.next(HashMap.java:834)
        at java.util.HashMap$EntryIterator.next(HashMap.java:832)        at java.util.HashMap.putAll(HashMap.java:523)
        at org.sonatype.nexus.proxy.RequestContext.flatten(RequestContext.java:373)        at org.sonatype.nexus.feeds.AbstractEvent.addEventContext(AbstractEvent.java:66)
        at org.sonatype.nexus.events.ItemChangesFeedEventInspector.inspectForNexus(ItemChangesFeedEventInspector.java:105)
        at org.sonatype.nexus.events.ItemChangesFeedEventInspector.inspect(ItemChangesFeedEventInspector.java:58)
        at org.sonatype.nexus.events.DefaultEventInspectorHost$EventInspectorHandler.run(DefaultEventInspectorHost.java:157)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:680)2011-01-07 14:12:51 INFO  [Thread-32      ] - org.apache.shiro.session.mgt.AbstractValidatingSessionManager - Validating all active sessions...