> Now I have imported src/main and jdbc_30 so I have no errors.
> Is that right or should I take jdbc_20?

Depends on JDK: jdbc_30 for JDK 1.4.x and 1.5.x, jdbc_20 for JDK 1.3.1.

> My problems were missing javax.resource.*, but since I have imported
> thirdparty/jboss/.../main there are no more errors in src/main.

Yup, that is also correct.

> Now I try to implement my source code. I ask you if I have more problems.

Ok.

Roman