[hibernate-dev] WildFly error running org.jboss.as.test.integration.jpa.hibernate.classfiletransformertest.ClassFileTransformerTestCase (sets hibernate.ejb.use_class_enhancer to true)

[Scott Marlow]

We are getting a "Failed to define class 
org.jboss.as.test.integration.jpa.hibernate.SFSBHibernateSessionFactory" 
error when running the WildFly tests on the CI machine.  I don't see 
this error locally which is why we didn't see this before.

[1] shows the WildFly console at the time of error.

The class that cannot be defined is 
https://github.com/wildfly/wildfly/blob/master/testsuite/integration/basic/src/test/java/org/jboss/as/test/integration/jpa/hibernate/SFSBHibernateSessionFactory.java 
[2]

I suspect that this is some type of race condition that we are hitting 
with deployment of three persistence units [3] concurrently from three 
threads.  The persistence units have "hibernate.ejb.use_class_enhancer" 
set to true.  This might have something to do with the same appliation 
class being enhanced concurrently from three threads.

The test case [4] is verifying that enhanced application classes can be 
used.

I'm not exactly sure why the SFSBHibernateSessionFactory class is being 
enhanced.  I thought we only enhanced the entity classes 
(SFSBHibernateSessionFactory references the Employee entity class but is 
not an entity class).

Scott

[1] https://gist.github.com/scottmarlow/c56cfe07f2ea514354aa

[2] 
https://github.com/wildfly/wildfly/blob/master/testsuite/integration/basic/src/test/java/org/jboss/as/test/integration/jpa/hibernate/SFSBHibernateSessionFactory.java

[3] 
https://github.com/wildfly/wildfly/blob/master/testsuite/integration/basic/src/test/java/org/jboss/as/test/integration/jpa/hibernate/classfiletransformertest/persistence.xml

[4] 
https://github.com/wildfly/wildfly/blob/master/testsuite/integration/basic/src/test/java/org/jboss/as/test/integration/jpa/hibernate/classfiletransformertest/ClassFileTransformerTestCase.java