java.lang.NullPointerException
   at org.datanucleus.enhancer.asm.ASMClassEnhancer.enhance(ASMClassEnhancer.java:352)
   at org.datanucleus.enhancer.DataNucleusEnhancer.enhanceClass(DataNucleusEnhancer.java:974)
   at org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:570)
   at org.datanucleus.enhancer.EnhancerProcessor$EnhanceRunnable.run(EnhancerProcessor.java:164)
   at java.lang.Thread.run(Thread.java:619)