I'm having trouble building a project after enabling @Embeddable on a class (I have lots of entities and that all works fine). Neither
Maven nor Eclipse can compile the project. It seems like the compiler just stops with absolutly no feedback as to why. The compiler
only gets to copy non-java resources but doesn't generate the metamodel or compiler any classes.

I haven't found any logs, or been able to make the metamodel generator debug option work. There is nothing relevent in the Eclipse
workspace log either. Any pointers as to how to diagnose this further would be very much appreciated.

I'm using Hibernate ORM 4.3.1 (also 4.3.3), Eclipse Kepler SR1 and Java SE 7 u51.

So the reason I couldn't see any useful failure information was that in my POM when invoking the maven-compiler-plugin, it was set to fork. Once I turned that off, I was able to determine that a NPE was ocurring in the metamodel generator. I have since raised an issue in Jira (https://hibernate.atlassian.net/browse/HHH-9015).