o.a.w.page.persistent.disk.DiskDataStoreTest fails with JDK6 but passes with 
JDK5
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                 Key: WICKET-3910
                 URL: https://issues.apache.org/jira/browse/WICKET-3910
             Project: Wicket
          Issue Type: Bug
          Components: wicket-core
    Affects Versions: 1.5-RC5.1
         Environment: Hostspot 1.6.0_26, 1.5.0_22
            Reporter: Attila Király


I am running "mvn clean package" on the command line and based on the jdk I get 
different results (reproducable).

With jdk6 the test fails and the following is logged:
ERROR - DiskDataStoreTest          - data[] should never be null
ERROR - DiskDataStoreTest          - Detected error number: 1
ERROR - DiskDataStoreTest          - data[] should never be null
ERROR - DiskDataStoreTest          - Detected error number: 2
Exception in thread "Thread-22" java.lang.NullPointerException
        at 
org.apache.wicket.page.persistent.disk.DiskDataStoreTest$Read1Runnable.run(DiskDataStoreTest.java:231)
        at java.lang.Thread.run(Thread.java:662)
Exception in thread "Thread-42" java.lang.NullPointerException
        at 
org.apache.wicket.page.persistent.disk.DiskDataStoreTest$Read2Runnable.run(DiskDataStoreTest.java:264)
        at java.lang.Thread.run(Thread.java:662)

With jdk5 everything goes fine and above message is not logged.

The datastore in the test is returning null in the Read1Runnable and 
Read2Runnable which is causing the NPE.

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