I'm using Hibernate EntityManager 3.3.2, Core 3.2.6, and Annotations 3.3.1.

Not sure if this information will help, but the problem appears to have started after upgrading from Netbeans RCP 6.1 to 6.5.

I'm getting the exception below when I try to create an EntityManagerFactory. I know this class is part of the javassist library, which I've never needed before. In addition, I thought this library was only required if using javassist as the bytecode provider. Is this true? Does the stack trace below indicate that Hibernate is using javassist as the bytecode provider? I couldn't tell from looking at the source code. From what I've seen AbstractJarVisitor is a fairly generic class and is explicitly referencing the class, "ClassFile", so I'm starting to think that javassist is required no matter what bytecode provider is being used.

Though, it's odd to me that this problem would come about with the change in Netbeans versions.

In any case, can anyone provide some info here about the dependency on the javassist library?

Thanks.

java.lang.NoClassDefFoundError: javassist/bytecode/ClassFile
at org.hibernate.ejb.packaging.AbstractJarVisitor.checkAnnotationMatching(AbstractJarVisitor.java:236)
at org.hibernate.ejb.packaging.AbstractJarVisitor.executeJavaElementFilter(AbstractJarVisitor.java:202)
at org.hibernate.ejb.packaging.AbstractJarVisitor.addElement(AbstractJarVisitor.java:163)
at org.hibernate.ejb.packaging.FileZippedJarVisitor.doProcessElements(FileZippedJarVisitor.java:100)
at org.hibernate.ejb.packaging.AbstractJarVisitor.getMatchingEntries(AbstractJarVisitor.java:139)
at org.hibernate.ejb.Ejb3Configuration.addScannedEntries(Ejb3Configuration.java:287)
at org.hibernate.ejb.Ejb3Configuration.addMetadataFromVisitor(Ejb3Configuration.java:282)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:247)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:125)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)

I believe you need to set the following property to use cglib, instead of javassist