Stephan Hagedorn created OPENJPA-2257:
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             Summary: Concurreny in org.apache.openjpa.persistence.EntityManagerImpl.getProperties leads to NullPointer and ConcurrentModificationException
                 Key: OPENJPA-2257
                 URL: https://issues.apache.org/jira/browse/OPENJPA-2257
             Project: OpenJPA
          Issue Type: Bug
          Components: jpa
    Affects Versions: 2.1.2
         Environment: AIX 6.1 (64-bit)
WebSphere Application Server V8.0 (32-bit) 
            Reporter: Stephan Hagedorn


A call of EntityManager.getProperties() can lead to NullPointer and ConcurrentModificationException. Issue occurs right after start up of the overlying JEE application if multiple EntityManager instance are created at same time.

Please find the issued stack trace below:

Caused by: java.lang.NullPointerException
        at java.lang.String.compareTo(String.java:482)
        at java.lang.String.compareTo(String.java:31)
        at java.util.TreeMap.cmp(TreeMap.java:4514)
        at java.util.TreeMap.putImpl(TreeMap.java:4556)
        at java.util.TreeMap.put(TreeMap.java:4536)
        at java.util.TreeSet.add(TreeSet.java:122)
        at
org.apache.openjpa.lib.conf.ConfigurationImpl.getPropertyKeys(ConfigurationImpl.java:708)
        at
org.apache.openjpa.kernel.BrokerImpl.getSupportedProperties(BrokerImpl.java:729)
        at
org.apache.openjpa.kernel.DelegatingBroker.getSupportedProperties(DelegatingBroker.java:223)
        at
org.apache.openjpa.persistence.EntityManagerImpl.getProperties(EntityManagerImpl.java:1624)
        ... 33 more

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