The change which comes in has the following format:

'create in the "system" workspace the node "/

{http://www.jcp.org/jcr/1.0}

system/

{http://www.modeshape.org/1.0}

locks/{}865c99c1-ff51-4e5e-a4fd-e0454b37db6a" with properties [

{http://www.modeshape.org/1.0}

lockedUuid = 8197546c-0a29-4b62-bab5-95e32a444e2b,

{http://www.jcp.org/jcr/1.0}

lockOwner = <anonymous>,

{http://www.modeshape.org/1.0}

expirationDate = 2011-01-18T17:06:37.449+01:00,

{http://www.jcp.org/jcr/1.0}

primaryType =

{http://www.modeshape.org/1.0}

lock,

{http://www.modeshape.org/1.0}

workspace = workspace1,

{http://www.modeshape.org/1.0}

lockingSession = 8a51f53c-6dc8-43cf-b699-df87eab70998,

{http://www.modeshape.org/1.0}

isHeldBySession = false,

{http://www.modeshape.org/1.0}

isSessionScoped = false,

{http://www.jcp.org/jcr/1.0}

lockIsDeep = true]'

The lock manager attempts to retrieve the ModeShapeLexicon.WORKSPACE_NAME property which is not present and it results into a call to the lockManagers map with a null argument.

EXCEPTION STACK:

17:05:37,828 ERROR [STDERR] Exception in thread "pool-34-thread-1"
17:05:37,880 ERROR [STDERR] java.lang.NullPointerException
17:05:37,881 ERROR [STDERR] at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
17:05:37,881 ERROR [STDERR] at org.modeshape.jcr.RepositoryLockManager.getLockManager(RepositoryLockManager.java:63)
17:05:37,881 ERROR [STDERR] at org.modeshape.jcr.RepositoryLockManager.notify(RepositoryLockManager.java:205)
17:05:37,881 ERROR [STDERR] at org.modeshape.jcr.JcrRepository$SystemChangeObserver.notify(JcrRepository.java:2014)
17:05:37,881 ERROR [STDERR] at org.modeshape.jcr.JcrRepository$RepositoryObservationManager$1.run(JcrRepository.java:1853)
17:05:37,881 ERROR [STDERR] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
17:05:37,881 ERROR [STDERR] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
17:05:37,881 ERROR [STDERR] at java.lang.Thread.run(Thread.java:619)