java.lang.NullPointerException

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  • NPE what's it mean?
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  • NullPointerException at commit()
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    • java.lang.NullPointerException at com.solarmetric.kodo.runtime.PersistenceManagerImpl.commit(PersistenceManagerImpl.java:478) at com.nokia.b2t.dna.persistence.PersistenceAccess.accessPersistence(PersistenceAccess.java:139) at com.nokia.b2t.dna.persistence.PersistenceAccess.accessPersistence(PersistenceAccess.java:77) at com.nokia.b2t.dna.preslayer.actions.NOLActionBase.perform(NOLActionBase.java:153) at org.apache.struts.action.Action.execute(Action.java:415) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:465) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1422) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:523)
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