Unable to open debugger port in IntelliJ IDEA

Question

I have a problem that I can not set up my application in debug mode with IntelliJ IDE, but run mode is OK.

My OS is Windows 7, IDE is IntelliJ IDEA, web container is Tom

Answer 1

There are various reasons for this.
- There might be the problem with debugger port---Please change it to resolve( answered by T.M )
- There might be some issue with intellij cache --Invalidate cache and restart will solve it ( answered by feng smith )
- There might be problem with any other Port, like JMX, AJP --- Please change these port numbers as well.
I wanted to add this as comment but not enough rep