Solution to "java.net.BindException: Address already in use" error?

Question

I'm using Intellij, attempting to deploy a Tomcat application, but whenever I try to run it, I get the following error:

Error: Exception thrown by the agent : java.rmi.server.ExportException: Port already in use: 1098; nested exception is:  java.net.BindException: Address already in use 

Now I've manually looked for the process happening at that port via:

lsof -i:1098 

And I found the java process and killed it too:

ps aux | grep java  kill -9 20386 

And that worked, but I have to do this EVERYTIME I open Intellij. If I want to rerun the server without exiting Intellij, I can't, because I'll get this error. Does anyone know of a permanent fix for this and not just manually killing it everytime?

Answer 1

This is due to JMX monitoring the Tomcat instance. Tomcat will be running on port 9999 so when JMX wants to start to check for the shutdown it can't bind to this port.

One way to fix this is to define your CATALINA_OPTS environment variable.

Setting these properties in JAVA_OPTS tries to start a jmx server when you start tomcat AND when you shutdown tomcat. Hence the port already in use exception. You need to set these properties for CATALINA_OPTS instead of JAVA_OPTS. This will only run when you start tomcat.

CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8999" CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false" 

What fixes it for me is in $HOME/.bashrc I add this export:

export CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8999"

Credit: https://bowerstudios.com/node/636

Answer 2

Click on the skull icon after stopping server to kill all associated processes. This should help in resolving the port issue.