Microsoft Azure Open Source Development Support Team Blog

Support for Open Source Technologies on Microsoft Azure App Service

Debugging Java containers

Can you debug Java applications within your container? Yes.

How? Check below…


1. Modify your dockerfile

  • To expose JPDA params

                 ENV JPDA_OPTS=”-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n”

  • To expose the debug port along with application port

                 EXPOSE 7080 8000

  • To add the options in your command

               CMD [“sh”, “-c”, “java $JPDA_OPTS -Durl=$url -jar app.jar”]


2. Build the docker and run with exposing the app port and debug port.

               docker run –d -p 7080:7080 <docker image>


3. Open the project in Eclipse and create a debug configuration with Host and debug port

image


4. Set the breakpoints and Launch the debug configuration. Voila! You are debugging the application in running container.