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Debugging a Web Dynpro Application 
The SAP NetWeaver Developer Studio provides tools for debugging your Web applications. For this purpose you can set breakpoints in the controller implementations of Web Dynpro applications. As with other Java code, you create reusable launch configurations and then use the debug perspective to debug the code.
For debugging, the Java Engine must be running with debugging enabled. By default, debugging is normally deactivated on the server. Additionally, the application being tested must have been deployed on the server. This part of the documentation demonstrates debugging based on the application ‘Welcome’ under ‘Creating Your First Web Dynpro Application’ in the ‘Getting Started’ section.
For the background information on using the debugger, see the Java Development User Guide (Help ® Help Contents), in particular the section Debug view.
See also:
Enabling Debugging on the Server
Setting Breakpoints in Web Dynpro Applications
Creating Debug Launch Configurations
Starting and Stopping Debugging
