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A debugger is one of the most powerful tools in a developers toolkit. This tutorial goes over how a user can run an AppFuse based web application and associated test cases under a debugger.
In this tutorial I show screentshots of debugging an Appfuse based project using IntelliJ IDEA but the same can be done using most Java IDE's including Eclipse.

[1] Open project using an IDE
[2] Running Test Cases in a debugger
[3] Running your web application under Tomcat in a debugger

Open project using an IDE [#1]

Open your project using IDEA or Eclipse. There are several HowTos on this available on the AppFuse page.
Here's a quick reference

How I setup my Development Environment.
Developing your AppFuse application in Eclipse.
- Using AppFuse with MyEclipse: Part I and Part II.
- AppFuse also supports IDEA 4.0 out-of-the-box, or at least the project files are included.

Running Test Cases in a debugger [#2]

In your IDE, set breakpoints at the appropriate locations in your code

Now run your test targets as usual however pass an additional system parameter in the format -Dprojectname-debug=true.
The sample project here is named "foo" so I run ant -Dfoo-debug=true test-dao as shown below.

This runs the java process in debug mode with shrared memory address projectname-debug which would be foo-debug in this case.
The JVM suspends at this point waiting for you to connect to the java process via a remote debugger.

The screenshot below illustrates how this is done in IDEA.

After connecting to the remote process, the java application resumes until a breakpoint in your code is hit.

You can now step through your code, examine variables, evaluate expressions etc..

Running your web application using a debugger under Tomcat [#3]

The process for debugging your web application when running under tomcat is similar to that described above.
Simply run ant -Dprojectname-debug=true start.tomcat. For this tutorial the command would be ant -Dfoo-debug=true start.tomcat.
You can set your breakpoint any where in your code like controllers, managers and DAO's. Tomcat also supports JSP debugging so you can also set breakpoint in your JSP code and troubleshoot those hard to track display issues.

Happy Debugging!!

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This particular version was published on 06-Nov-2006 13:52:48 MST by MattRaible.