Dear Azel, you don't need be an expert in every field.
Of course, you need to have some basic ideas about java.awt. package. It is basics for Java programmers. I do believe you shloud have a clear picture of Java event listener mechanisms.. Go ahead and good luck!
If I wanna find some jobs related to Java/JSP/XML/EJB , should I have some experience on Java GUI ??! I am familiar with server side java programming , but not the UI side . Should I learn ...