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java.lang.NullPointerException: 	at org.apache.openjpa.meta.ClassMetaData.validateAppIdClass(ClassMetaData.java:1883)	at org.apache.openjpa.meta.ClassMetaData.validateIdentity(ClassMetaData.java:1840)	at org.apache.openjpa.meta.ClassMetaData.validateMeta(ClassMetaData.java:1757)	at org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1630)	at org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataRepository.java:717)	at org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:616)	at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:541)	at org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:308)	at org.apache.openjpa.enhance.PCEnhancer.(PCEnhancer.java:249)	at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4502)	at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4449)	at org.apache.openjpa.enhance.PCEnhancer$1.run(PCEnhancer.java:4419)	at org.apache.openjpa.lib.conf.Configurations.launchRunnable(Configurations.java:726)	at org.apache.openjpa.lib.conf.Configurations.runAgainstAllAnchors(Configurations.java:716)	at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4414)	at org.apache.openjpa.enhance.PCEnhancer.main(PCEnhancer.java:4405)