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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:396)	at java.util.Properties.setProperty(Properties.java:128)	at oracle.toplink.essentials.internal.ejb.cmp3.xml.PersistenceContentHandler.startElement(PersistenceContentHandler.java:89)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:533)	at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:220)	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:322)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)	at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processPersistenceXML(PersistenceUnitProcessor.java:175)	at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processDirectory(PersistenceUnitProcessor.java:84)	at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processPersistenceArchive(PersistenceUnitProcessor.java:148)	at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.getPersistenceUnits(PersistenceUnitProcessor.java:64)	at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initPersistenceUnits(JavaSECMPInitializer.java:278)	at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initialize(JavaSECMPInitializer.java:301)	at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initializeFromAgent(JavaSECMPInitializer.java:318)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializerAgent.initializeFromAgent(JavaSECMPInitializerAgent.java:54)	at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializerAgent.premain(JavaSECMPInitializerAgent.java:47)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:141)