I do not arrive has to compile my projects it lacks me class, what I should install to obtain class necessary.
I have already installed Jbuilder 7 + Nokia Developper Suite J2ME v1.1 + MIDP.
I think you have not selected correct SDK for your project. Check your project properties. Before that you maybe need to add a new SDK (for example Nokia 6310 MIDP SDK 1.1) through the Configure JDKs tool.
JP / Forum Nokia