Message Title

I was just looking at the following TRACE output from deployment which hints that the problem may be in WildFly and not Hibernate:

2023-05-09 08:41:20,623 TRACE [org.jboss.as.jpa] (MSC service thread 1-5) added PersistenceUnitService (phase 2 of 2) for 'service jboss.persistenceunit."jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_puservlet_vehicle_we
{{b.war#CTS-EM"'. PU is ready for injector action. }}
2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 227) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_puservlet_vehicle_web.war#C
{{TS-EM' }}
2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 232) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_pmservlet_vehicle_web.war#C
{{TS-EM-NOTX' }}
2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 231) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_puservlet_vehicle_web.war#C
{{TS-EM2' }}
2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 88) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_pmservlet_vehicle_web.war#CT
{{S-EM2' }}
{{2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 225) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear#CTS-EM' }}
2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 230) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_pmservlet_vehicle_web.war#C
{{TS-EM' }}
{{2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 226) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear#CTS-EM-NOTX' }}
2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 229) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_puservlet_vehicle_web.war#C
{{TS-EM-NOTX' }}
{{2023-05-09 08:41:20,732 INFO [org.jboss.as.jpa] (ServerService Thread Pool – 228) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'jpa_core_query_flushmode_vehicles.ear#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 227) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_puservlet_vehicle_web.war#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 225) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 88) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImpl
{{' for 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_pmservlet_vehicle_web.war#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 230) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_pmservlet_vehicle_web.war#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 226) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 228) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 229) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_puservlet_vehicle_web.war#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 231) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_puservlet_vehicle_web.war#CTS-EM2' }}
2023-05-09 08:41:20,782 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 232) rewrite entity class 'com/sun/ts/tests/jpa/common/schema30/Department' using transformer 'org.hibernate.jpa.internal.enhance.EnhancingClassTransformerImp
{{l' for 'jpa_core_query_flushmode_vehicles.ear/jpa_core_query_flushmode_pmservlet_vehicle_web.war#CTS-EM2' }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 231) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 88) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 232) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 225) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 228) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 227) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 226) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 230) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,953 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 229) entity class 'com/sun/ts/tests/jpa/common/schema30/Department' was rewritten }}
{{2023-05-09 08:41:20,954 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 229) save entity class 'com/sun/ts/tests/jpa/common/schema30/Department' to /tmp/jpa/com/sun/ts/tests/jpa/common/schema30/Department.class }}
{{2023-05-09 08:41:20,954 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 231) save entity class 'com/sun/ts/tests/jpa/common/schema30/Department' to /tmp/jpa/com/sun/ts/tests/jpa/common/schema30/Department.class }}
{{2023-05-09 08:41:20,954 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 226) save entity class 'com/sun/ts/tests/jpa/common/schema30/Department' to /tmp/jpa/com/sun/ts/tests/jpa/common/schema30/Department.class }}
{{2023-05-09 08:41:20,954 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 230) save entity class 'com/sun/ts/tests/jpa/common/schema30/Department' to /tmp/jpa/com/sun/ts/tests/jpa/common/schema30/Department.class }}
{{2023-05-09 08:41:20,954 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 88) save entity class 'com/sun/ts/tests/jpa/common/schema30/Department' to /tmp/jpa/com/sun/ts/tests/jpa/common/schema30/Department.class }}
{{2023-05-09 08:41:20,954 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 232) save entity class 'com/sun/ts/tests/jpa/common/schema30/Department' to /tmp/jpa/com/sun/ts/tests/jpa/common/schema30/Department.class }}
2023-05-09 08:41:20,954 TRACE [org.jboss.as.jpa] (ServerService Thread Pool – 225) save entity class 'com/sun/ts/tests/jpa/common/schema30/Department' to /tmp/jpa/com/sun/ts/tests/jpa/common/schema30/Department.class

I suspect that WildFly (JPA/Persistence container) needs to ensure that only one thread at a time enhances the same application defined class. The above output seems racy to me. I'll try a quick hack to validate.

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