I am getting this error, while trying to deploy beans annotated using JPA. Beans from the second package or referencing beans from the first package and it fails with the following error. What should I do in order to resolve this class loader issue?

org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.two.domain.Idea.user references an unknown entity: com.one.domain.User: @OneToOne or @ManyToOne on com.two.domain.Idea.user references an unknown entity: com.one.domain.User
...
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPa
ss.java:81)
at org.hibernate.cfg.AnnotationConfiguration.processEndOfQueue(Anno
tationConfiguration.java:456)
at org.hibernate.cfg.AnnotationConfiguration.processFkSecondPassInO
rder(AnnotationConfiguration.java:438)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(Anno
tationConfiguration.java:309)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java
:1148)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configurat
ion.java:1226)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListe
nerConfigurator.java:173)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.
java:854)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.
java:425)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityMana
gerFactory(HibernatePersistence.java:131)
... 46 more

The below mentioned issue will not happen if all of the beans can be resolved under a single package folder. This seems to be an issue of resolving beans which are built / packaged in a different folder.

Any pointers to solve this issue are highly appreciated

Any solution?

Have the same problem. My application grows and using only one package for all entities is terrible. Trying to split them to different packages causes error:

org.hibernate.AnnotationException: @OneToOne or @ManyToOne on xx.db.ClientProduct.client references an unknown entity: xx.yy.db.Client

any solution? is it solvable by replacing annotations by ejb-jar.xml entries?

I still haven't seen a solution to this problem and all my entity classes are compiled as a single unit (not into separate jars). This seems to be a very basic requirement, not sure how others are solving this problem though.