If we threading to add nodes into the repository
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                 Key: JCR-1939
                 URL: https://issues.apache.org/jira/browse/JCR-1939
             Project: Jackrabbit Content Repository
          Issue Type: Bug
    Affects Versions: 1.5.0
         Environment: Microsoft windows XP professional, 2GB ram
            Reporter: akil ajani
             Fix For: 1.5.0


Senario 1: 
we have a root node and it has 1 parent node. i am trying to add 600 nodes to 
that parent node. so i have created 3 threads and each thread is adding 200 
nodes. it works for some time and later on throws an exception

java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
        at java.util.HashMap$ValueIterator.next(HashMap.java:817)
        at 
java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
        at 
org.apache.jackrabbit.core.state.SessionItemStateManager.getDescendantTransientItemStates(SessionItemStateManager.java:376)
        at 
org.apache.jackrabbit.core.ItemImpl.getTransientStates(ItemImpl.java:361)
        at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:1079)
        at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:849)

some time it gets HANGED

Scenario:2
we have a root node and it has 2 parent node. i am trying to add 600 nodes to 
eac parent node. so i have created 2 threads and each thread is adding 600 
nodes to cach parent node. it works for some time and later on throws an 
exception

java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
        at java.util.HashMap$ValueIterator.next(HashMap.java:817)
        at 
java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
        at 
org.apache.jackrabbit.core.state.SessionItemStateManager.getDescendantTransientItemStates(SessionItemStateManager.java:376)
        at 
org.apache.jackrabbit.core.ItemImpl.getTransientStates(ItemImpl.java:361)
        at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:1079)
        at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:849)

some time it gets HANGED

please help me to resolve this issue as soon as possible. i would be thankful 
to you if you could provide me the solution for this as soon as possible


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