Application slowed in JackRabbit CachingEntryCollector

Issue

• JBoss becomes unresponsive and our thread pools are exhausted in calls like the following:

   java.lang.Thread.State: BLOCKED (on object monitor)
    at org.apache.jackrabbit.core.security.authorization.acl.CachingEntryCollector.getEntries(CachingEntryCollector.java:95)
    - waiting to lock <0x000000058c050be8> (a java.lang.Object)
    at org.apache.jackrabbit.core.security.authorization.acl.EntryCollector.collectEntries(EntryCollector.java:148)
    at org.apache.jackrabbit.core.security.authorization.acl.CompiledPermissionsImpl.canRead(CompiledPermissionsImpl.java:264)
    - locked <0x00000005b7b77f30> (a java.lang.Object)
    at org.apache.jackrabbit.core.security.DefaultAccessManager.canRead(DefaultAccessManager.java:265)
    at org.apache.jackrabbit.core.ItemManager.canRead(ItemManager.java:438)
    at org.apache.jackrabbit.core.ItemManager.createItemData(ItemManager.java:843)
    at org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:391)
    at org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:304)
    at org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:523)
    at org.apache.jackrabbit.core.NodeImpl.hasProperty(NodeImpl.java:2403)