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

For me, IntelliJ Event Log (right bottom corner) had below logs:

Error running EntitmentTooling-Debug: Cannot run program "/path-to/apache-tomcat-8.5.15/bin/catalina.sh" (in directory "path-to/apache-tomcat-8.5.15/bin"): error=13, Permission denied

Error running EntitmentTooling-Debug: Unable to open debugger port (127.0.0.1:58804): java.net.SocketException "Socket closed"

The command

$ chmod a+x /path-to/apache-tomcat-8.5.15/bin/catalina.sh

to sufficiently change privileges worked for me.

Answer 2

If you're on windows you can bypass the socket issue completely by switching to shared memory debugging.

Answer 3

I have encountered the same error while using IntelliJ. Since I have started multiple instances of IntelliJ. While starting two instance it started properly. However, when starting another one, it was giving below error.

unable to open debugger port (127.0.0.1:debug-port-number) java.net.socketexception interrupted function call accept failed

There are basically two places you can check your ports related to debugging in IntelliJ

1. JMX port - you can find this is
2. In Startup/Configuration, there is debug option just click this.

What to Check: If IntelliJ is throwing above error, means issue is any of the above listed ports. To verify this open event log (its available in right corner down) and check the exact message. Event log will have message like below

11:19 PM    Error running 'Tomcat-tp': Address localhost:1098 is already in use

11:19 PM    Error running 'Tomcat-tp': Unable to open debugger port (127.0.0.1:51787): java.net.SocketException "Interrupted function call: accept failed"

Solution-1 Check the JMX port of current intelliJ which is not starting with the working one and verify if JMX ports are not duplicated within IntelliJ instance or any of the software which is running in your machine is not using this port.

Solution-2 If JMX is not duplicated then verify your debug port, check in all IntelliJ instance and do the changes.

Surely either JMX or Debug port is having issue just use unique JMX and Debug port and it will work.

Hope this will help someone.

Answer 4

In Server tab of Tomcat configuration in IntelliJ, change JMX port to another number.

Answer 5

In my case, there was a problem in server.xml for Tomcat/conf folder where I had extra comment tags under another comment tag. So I think, since there was some problem in server.xml, it was not able to start Tomcat. And moreover it copies the tomcat folder from your installation directory to C:\Users\username.IntelliJIdea2017.2\system\tomcat\Tomcat_service

Answer 6

I came in this scenario and as the above answers I tried to change the port like Edit Configuration -> Startup/Connection -> debug -> change the Port but it didn't solve my problem cause I was running my application in debug mode so once try to run the application as normal without debug. it solved my problem!