java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:630)
at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:474)
at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at com.tc.object.loaders.StandardClassProvider.getClassFor(StandardClassProvider.java:88)
at com.tc.object.ClientObjectManagerImpl.lookup(ClientObjectManagerImpl.java:539)
at com.tc.object.ClientObjectManagerImpl.lookupObject(ClientObjectManagerImpl.java:442)
at com.tc.object.ClientObjectManagerImpl.lookupObject(ClientObjectManagerImpl.java:430)
at com.tc.object.bytecode.ManagerImpl.lookupObject(ManagerImpl.java:751)
at com.tc.object.bytecode.ManagerUtil.lookupObject(ManagerUtil.java:389)
at java.util.HashMap.lookUpIfNecessary(Unknown Source)
at java.util.HashMap.lookUpAndStoreIfNecessary(Unknown Source)
at java.util.HashMap.access$500(Unknown Source)
at java.util.HashMap$EntryWrapper.getValue(HashMap.java:513)
at com.uk.realistic.regal.terracotta.indexes.Index.findLeafForKey(Index.java:178)
at com.uk.realistic.regal.terracotta.indexes.Index.findLeafForKey(Index.java:184)
at com.uk.realistic.regal.terracotta.indexes.Index.findLeafForKey(Index.java:184)
at com.uk.realistic.regal.terracotta.indexes.Index.findLeafForKey(Index.java:172)
at com.uk.realistic.regal.terracotta.indexes.Index.processUpdate(Index.java:234)
at com.uk.realistic.regal.terracotta.TerracottaCachePartition.processIndexUpdateNoLock(TerracottaCachePartition.java:393)
at com.uk.realistic.regal.terracotta.TerracottaCachePartition.processIndexUpdate(TerracottaCachePartition.java:384)
at com.uk.realistic.regal.terracotta.TerracottaCache.addToData(TerracottaCache.java:481)
at com.uk.realistic.regal.terracotta.TerracottaCache.put(TerracottaCache.java:452)

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