Need tutorial

HI,i need a tutorial about ejb.I had already practiced some tutorialsiCreating a J2EE-Based Car Rental Application,Creating your First J2EE Application...j.

Now i want to practice some tutorials about N to N relationships. Could anyone help me look for such the tutorialH THX a lot!

my mailFs9213007@ncnu.edu.tw

or 93423020@ncu.edu.tw