Despite https://hibernate.atlassian.net/browse/HHH-10973 , on 5.2.5.Final I'm still getting:

[INFO] Starting Hibernate enhancement for classes on yyy\target\classes
Dec 09, 2016 8:44:23 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.5.Final}
Dec 09, 2016 8:44:23 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Dec 09, 2016 8:44:23 PM org.hibernate.bytecode.enhance.internal.javassist.EnhancerImpl enhance
INFO: Enhancing [xxx.InterfaceTask] as Entity
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.301 s
[INFO] Finished at: 2016-12-09T20:44:23-05:00
[INFO] Final Memory: 29M/1963M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.hibernate.orm.tooling:hibernate-enhance-maven-plugin:5.2.5.Final:enhance (default) on project business-apps-core: Unable to enhance class: InterfaceTask.class: xxx.InterfaceTask class is frozen -> [Help 1]

I am running this from Eclipse M2E. I have tried several times cleaning, etc., but no progress. Any ideas?

We know about this issue, it's been documented in HHH-11322. It will be fixed in 5.2.6.

Thanks for confirming.