How to remote debug Java application in Wildfly on a Docker container using Eclipse

If you are developer an Java application which is using Wildfly and Docker for deploying but you sucked at how to debug your application, this post help give you a little bit. You only need to add more some configuration to your application. Let do it.

Step 1 — Prepare standalone.conf file

If you already downloaded the Wildfly you can easily find the standalone.conf at Wildfly folder/bin/standalone.conf

If not you can get here

https://github.com/wildfly/wildfly-core/blob/master/core-feature-pack/src/main/resources/content/bin/standalone.conf

And copy it into your application, for example:

/profile-folder/wildfly/standalone.conf

Next, find the part

# Sample JPDA settings for remote socket debugging

Replace the line

#JAVA_OPTS=”$JAVA_OPTS -agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=n”

with

JAVA_OPTS=”$JAVA_OPTS -Xdebug -Xrunjdwp:transport=dt_socket,address=*:8787,server=y,suspend=n”

Step 2 — Config your Dockerfile

# Your docker configs
ADD wildfly/standalone.xml standalone/configuration
CMD [“/opt/jboss/wildfly/bin/standalone.sh”, “-b”, “0.0.0.0”, “-bmanagement”, “0.0.0.0”]

Step 3 — Run your application

docker run — name your-app -p 8787:8787

You should able to find the below log in console

Listening for transport dt_socket at address: 8787

Step 4 — Config your Eclipse

Hit Debug and happy debug