Sample CLDC Debugging Session

This procedure provides instructions for running the FPDemo sample project on a device running Windows Mobile. You can use this procedure with any CLDC project.

1. In the Java ME Platform SDK, select File > Open Sample Project > FPDemo.
2. In the Projects window, right-click on FPDemo and select Properties.
3. Choose the Platform category. From the Device drop-down menu, select the name of the connected device. Click OK.
4. Select FPDemo and select Run > Run Project in Debug Mode, or click the Run Main Project in Debug mode icon on the toolbar.
5. Open a terminal window.
6. Start jdb with the following command:

   Windows

   jdb -sourcepath installdir\apps\FPDemo\src -connect com.sun.jdi.SocketAttach:hostname=127.0.0.1,port=port-number

   Mac OS

   jdb -sourcepath installdir/Contents/Resources/apps/FPDemo/src -connect com.sun.jdi.SocketAttach:hostname=127.0.0.1,port=port-number

   In this case the port number is 51307 to match the default debugging port number.

7. Set the breakpoint at the place where the demo handles its menu commands:

   stop in calculator.CalculatorMIDlet.commandAction

8. In the FPDemo application, enter two numbers, choose an operation, and invoke the Calc command.

   The debugger displays the place where the execution stops.

9. To step through the source past the point where the result is calculated, use the next command pass the following line:

   res = n1 <op> n2;

   Type next to continue.

10. Check that the input and the calculated values are correct:

    eval n1

    eval n2

    eval n

11. Override the calculated value as follows:

    set res = new-value

    Type next to continue.

12. Clear the breakpoint as follows:

    clear calculator.CalculatorMIDlet.commandAction

13. Let the application continue:

    cont

    You can see that the application displays the overridden result.

14. Exit the debugger:

    exit

15. Exit FPDemo.

Related Information

• On-device Debugging Procedure

• Attach a Command Line Debugger

• Attach a Graphical Debugger