If you have a java app or game which is overlapped in your phone, means it has different screen size of your phone. For exp your phone has screen resolution of 176x208 but the app has resolution of 240x320. In this condition the app will not run properly and you'll not able to see all options on that app. The solution isto change the screen resolution of app.
Just open this Online Java Screen Adapter (English Translated Page ) service and select the file system, screen size, keyboard pattern. Than after paste the direct link of jar file on the field: Enter the address of the file. JAR (URL http://) and click on"Adapt".
The next page will show you the links to the modified .jad and .jar file. Download both the jad and jar files and transfer both jar and jad to your mobile and run the .jad file to start installation.