Java EE debugging methods

Written todayProgramThe expected results have never been returned, but no errors have been reported. The operation is successful.

I couldn't find the result for half a day. What went wrong. System. Out. println () cannot be found.

 

 

Debugging methods:

 

First: the simplest. Directly use system. Out. println ();

 

Type 2: Step-by-Step tracing and debugging. Eclipse menu bar,Window-> preferences-> tomcat->
Source Path

Add Java projects to Source Path (eclipse debugger will search for source files in these projects)

Select the project folder you want to debug.

 

Third: To be continued.