You are currently using Personal SNiFF+J.
 
While using Personal SNiFF+J, the GUI Builder will
not allow you to generate Java code. You will be
able to use all the other features of the SNiFF+J
GUI Builder and save your design.
 
Press the "Continue" button to start the SNiFF+J
GUI Builder in this restricted mode.
 
Please contact TakeFive Software at
http://www.takefive.com if you would like to receive
a free unlimited-use evaluation key or to purchase
a permanent license key for commercial use.

For details, please see the end-user license.