MIDP: Debugging Basics
FORUM NOKIA
Version 1.0; Septembe 6, 2005
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Contents
1 Introduction................................................................................................................................................ 5
2 Environment Construction ...................................................................................................................... 6
3 Debugging Process in Eclipse ................................................................................................................. 7
3.1 Breakpoint Setting...................................................................................................................................7
3.1.1 Conditional breakpoints ......................................................................................................8
3.1.2 Method breakpoints..............................................................................................................9
3.1.3 Exception breakpoints..........................................................................................................9
3.2 Debug Session ...........................................................................................................................................9
3.3 Execution Control ..................................................................................................................................10
3.4 Program State Investigation .............................................................................................................11
3.4.1 View field values .................................................................................................................11
3.4.2 Change variable values .....................................................................................................11
3.4.3 Evaluate expressions .........................................................................................................11
3.4.4 Stack follow up ....................................................................................................................13
3.4.5 View program output........................................................................................................13
4 Using Trace Options ................................................................................................................................14
5 Example Application ...............................................................................................................................15
6 Known Issues............................................................................................................................................16
7 References .................................................................................................................................................18
Appendix A HelloMIDlet class...................................................................................................................19
Appendix B TestForm class .......................................................................................................................20
Evaluate This Resource ..................................................................................................................................21
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Change History
September 26, 2005 Version 1.0 This new document replaces the document Debugging Wireless
J2ME™/MIDP Applications: An Introduction.
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1 Introduction
Programming requires a lot of logical reasoning and even senior level programmers may write
erroneous code. Nowadays nearly every IDE offers features for code debugging. With a debugger it is
effortless to detect and correct bugs from the code.
The scope of this document is to introduce how to debug CLDC-based J2ME™
applications by using
Eclipse IDE and Nokia SDKs. As a debugging exercise, the document also provides a simple example
application containing a few bugs.
MIDP: Debugging Basics 5
