EJB2.1 problem

When creating an CMP EJB (EJB2.1) in Idea 8.01 the tool insists on creating an empty primary key class even though the type is eg. String - ie. I get an empry String.java in package java.lang in the project. How can this behaviour be suppressed?

Also, is there any option of generating the bean source and descriptors from a datasource? (would expect it but can't find it)

Thanks!
thor_b