When running the datanucleus:enhance command twice, the build results in a java.lang.Verify error:

[INFO] --- maven-datanucleus-plugin:3.0.1:enhance (default-cli) @ edel-model-test ---
[INFO] DataNucleus Enhancer (version 3.0.1) : Enhancement of classes

[ERROR] --------------------
[ERROR] Standard error from the DataNucleus tool + org.datanucleus.enhancer.DataNucleusEnhancer :
[ERROR] --------------------
[ERROR] Dec 10, 2011 9:32:12 PM org.datanucleus.enhancer.DataNucleusEnhancer <init>
INFO: DataNucleus Enhancer : Using ClassEnhancer "ASM" for API "JDO"
Dec 10, 2011 9:32:12 PM org.datanucleus.enhancer.DataNucleusEnhancer main
INFO: DataNucleus Enhancer (version 3.0.1) : Enhancement of classes
Exception in thread "main" java.lang.VerifyError: Expecting a stackmap frame at branch target 18 in method com.vivo.project.model.test.Foo.jdoMakeDirty(Ljava/lang/String;)V at offset 4
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
        at java.lang.Class.getDeclaredMethods(Class.java:1808)
        at org.datanucleus.metadata.annotations.AbstractAnnotationReader.getJavaBeanAccessorAnnotationsForClass(AbstractAnnotationReader.java:306)
        at org.datanucleus.metadata.annotations.AbstractAnnotationReader.getMetaDataForClass(AbstractAnnotationReader.java:143)
        at org.datanucleus.metadata.annotations.AnnotationManagerImpl.getMetaDataForClass(AnnotationManagerImpl.java:171)
        at org.datanucleus.metadata.MetaDataManager.loadAnnotationsForClass(MetaDataManager.java:2459)
        at org.datanucleus.metadata.MetaDataManager.loadClasses(MetaDataManager.java:487)
        at org.datanucleus.enhancer.DataNucleusEnhancer.getFileMetadataForInput(DataNucleusEnhancer.java:799)
        at org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:590)
        at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1390)


Normally, one wouldn't run datanucleus:enhance twice manually, but when building a project using the "package" or "install" commnands (which may very well be run without doing a "clean" first), the datanucleus:enhance command is also run, and therefore the build fails with java.lang.Verify.