I have a very peculiar problem:

I'm using Hibernate in Maven based project inside of Eclipse, and I'm checking Hibernate console configurations in JBoss's Hibernate Tools plugin.

I have identical configuration for two projects:

In one project I have all classes with annotations listed/found in the Hibernate console (created in the Eclipse's Hibernate perspective).
And in the second it's only one explicitly specified that is listed/found!

I can't see no obvious reason for not finding all annotated classes in the second project.

Any ideas? Classpath, maybe?

For Hibernate to automatically pick up entities they need to be in a standard packaged persistence unit.

Meaning META-INF/persistence.xml should be next to the classes in the classpath.

Otherwise they won't be considered as entities.

Problem solved. But I'm not sure how.

It was some Eclipse issue, because when deployed to Jetty server the persistence unit did found all entities inside the project. And in the same time the JBoss Tools (Hibernate Tools) plugin didn't.

The next day, in Eclipse it just worked!?!
I guess it's something about Eclipse's internal configuration on workspaces, classpaths, cashing of metadata, etc.
Which is even more stranger to me 'cause I did rebooted on the previous day too.

My guess is that when you deployed the META-INF/persistence.xml where the first time that file entered into your classpath explaining why it works now, but not before.