Debugging a Project in JDeveloper

Make sure that your code is compiled with debugging information in Tools | Project Properties - Compiler before you can make use of some of the debugger features such as viewing arguments and local variables in the Data window.

See About Debugger Icons to determine the purpose and functions of the various debugger icons displayed on the toolbar or in the debugger windows. Each of these commands is also available from the Debug main menu.

To set breakpoints and step through your code:

In the Code Editor, set a breakpoint on an executable statement by clicking in the margin to the left of the statement.
The unverified breakpoints icon appears in the left margin.
Select D ebug | Debug [filename .java] or click on the toolbar.
The class runs and stops at the first breakpoint.
From the toolbar, click Step Into to trace into a method call or click Step Over to step over a method call.
Look in the Stack window to examine the sequence of method calls that brought your program to its current state. Double-click a method to display the associated source code in the Code Editor.
In the Smart Data and Data windows, examine the arguments and variables.
Display the Threads window to see the status of other threads in your program.

To edit and recompile:

When you have found lines of code to change, you can end the debugging session by clicking Terminate on the toolbar, or by choosing R un | Terminate.
Edit your code in the Code Editor.
In the Navigator, click the appropriate object node, then choose Run | Make <filename.java> from the main menu. The affected files in your project are recompiled, and you can run the debugger again.