ConcurrentModificationException occurs on TimedCachePolicy.getValidKeys()

Issue

ConcurrentModificationException occurs on TimedCachePolicy.getValidKeys() method.

java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
        at java.util.HashMap$EntryIterator.next(HashMap.java:851)
        at java.util.HashMap$EntryIterator.next(HashMap.java:849)
        at org.jboss.util.TimedCachePolicy.getValidKeys(TimedCachePolicy.java:364)
        at org.jboss.virtual.plugins.cache.IterableTimedVFSCache.findContext(IterableTimedVFSCache.java:65)
        at org.jboss.virtual.plugins.cache.CombinedVFSCache.findContext(CombinedVFSCache.java:116)
        at org.jboss.virtual.plugins.registry.DefaultVFSRegistry.getFile(DefaultVFSRegistry.java:148)
        at org.jboss.virtual.VFS.getRoot(VFS.java:243)
        at org.jboss.virtual.VFS.getRoot(VFS.java:313)

• The exception is occurring when attempting to create a CXF client for a web service