If code is inside try..catch block ,we should not display exception on the Java console for the relevant actions. Though the control is working fine by executing the code inside the catch block but exception getting dumped on Java console could be alarming for the end users.
For following applet each and every important call is inside try...catch block still exception stack trace getting dumped onto the Java console.
http://sqeweb.sfbay.sun.com/deployment2/jitu/plug-bug/ojiliveconnect/src/JSObjectRemMemb.html