The debugger enables you to detect and diagnose errors in your
application. It allows you to control the execution of your program by setting
breakpoints, suspending threads, stepping through the code, and examining
the contents of the variables. You can debug a servlet on a server without losing the state of your application.
To debug a servlet on a server:
- In the Project Explorer view, open your servlet. In
a Web project, servlets are located in the JavaSource folder. The servlet opens in
the Java editor.
- To set one or more breakpoints in the editor, double-click in the
margin beside the line of code that you want to set as a breakpoint.
- Ensure the project is associated to run on a server.
- Select the servlet and from the servlet's context menu in the Project
Explorer view, click Debug As > Debug on Server. Open the Servers view to see that the server is launched.
- When the breakpoint is hit, the Debug view opens. Step
through the code, inspect and display variables, and make any necessary changes
to the servlet. For detailed information on debugging, refer to the online
help.
- When you are finished debugging, remove the breakpoint and save
the servlet.
- Click the Resume icon on the Debug toolbar
to execute the servlet.
- If you have hot method replace enabled, your changes are already
in the running application.
- If you have automatic class reloading enabled, which is the default
setting, click the Refresh icon in the Web Browser
to update the changes. You do not lose the state of your application.
- You lose the state of the application. To update the
changes restart the server.
The server recognizes your changes.
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