I have a problem with breakpoints in WSAD(Websphere Application Developer).
Suddenly breakpoints are not working. Can anyone help me in solving this problem

Run the Server in Debug Mode and use Key F6 to Debug code

Please make sure that the source code that you are trying to debus is also included in the WAR, which is intrun added into EAR as deployment. In short that project also needs to be added into the server for debugging.

Also make sure that the class you are trying to debug is a part of that command that you hit.

One of the reasons may be related to code being not compiled properly This happens sometimes when you replace jar's and restart server clean entire project and rebuild and deploy.