1) Go to ST01 and switch ON the trace
2) Do the required actions on Java webdynpro screen such as (Press any Button: Save/update/Delete)
3) Go to ST01 and switch OFF the trace and Press analysis to see the required RFCs
4) Go to SE37 and find the RFC name. on the external debugging , put the break point
5) Do the required actions on Java webdynpro screen as done in step 2 and find that the debugger is on.