A mobile device can be used in a variety of environments and situations. Because of this, MIDlets must work without error if the environment changes rapidly. If, however, errors do occur, they must be handled gracefully.
Basically, it is extremely important that all exceptions are carefully handled in the code and the MIDlet run is guaranteed regardless of the exception. Make sure that the user is well informed in case of extraordinary situations. Also note that any error messages in the application must be clearly understandable. Error messages must clearly explain the nature of the problem and indicate what action needs to be taken.
Check that:
MIDlets work correctly even though the environment may change.
If errors occur, they are handled gracefully.
The MIDlet runs even though exceptions are handled at the same time.
The user is informed in extraordinary situations.
Error messages are easy to understand by any end user.