title: GAE , Some Exception after upgrade datanucleus jar packages
body: <p>When I changed the sdk orm jar to v2 (default including by sdk),I got some excepion info.It's about the datanucleus-core-3.0.6.jar has ben registed bla bla....
  After search,I knew it was a bug in 3.0.6. So, I relpace it by datanucleus-core-3.0.10.jar.
  But it not success when compile the pojo Enhancer</p>
  
  <pre><code>java.lang.RuntimeException: Unexpected exception
      at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:76)
      at com.google.appengine.tools.enhancer.Enhance.&lt;init&gt;(Enhance.java:71)
      at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)
  Caused by: java.lang.reflect.InvocationTargetException
      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:597)
      at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)
      ... 2 more
  Caused by: java.lang.NoSuchMethodError: org.datanucleus.plugin.PluginManager.&lt;init&gt;(Lorg/datanucleus/PersistenceConfiguration;Lorg/datanucleus/ClassLoaderResolver;)V
      at org.datanucleus.OMFContext.&lt;init&gt;(OMFContext.java:159)
      at org.datanucleus.enhancer.DataNucleusEnhancer.&lt;init&gt;(DataNucleusEnhancer.java:172)
      at org.datanucleus.enhancer.DataNucleusEnhancer.&lt;init&gt;(DataNucleusEnhancer.java:150)
      at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1157)
      ... 7 more
  </code></pre>
  
  <p>this is my jar file in the \lib\user\orm</p>
  
  <pre><code>asm-3.3.1.jar
  datanucleus-api-jdo-3.0.5.jar
  datanucleus-api-jpa-3.0.6.jar
  datanucleus-appengine-2.0.0-final.jar
  datanucleus-core-3.0.10.jar
  geronimo-jpa_2.0_spec-1.0.jar
  jdo-api-3.0.jar
  transaction-api-1.1.jar
  </code></pre>
  
  <p>I has been looking for all day. Does any know what problem with it?</p>