Debug your Java application using Docker on IntelliJ

1. Create a sample SpringBoot application

   • Create a SpringBoot app using https://start.spring.io/
   • Open the SpringBoot app with intellij
   • Create a Rest endpoint GreetingController

2. Run the application using Docker

   • Initialise the Dockerfile and the docker-compose.yml files

   • Enable the debug agent and port in the docker configuration

     • Dockerfile

        ENV JAVA_TOOL_OPTIONS -agentlib:jdwp=transport=dt_socket,address=5005,server=y,suspend=n
     

     • docker-compose.yml

     - 5005:5005
     

   • Start the SpringBoot application with Docker compose

      docker-compose up --build
   

   • Call the rest endpoint

      http://localhost:8080/greeting
      http://localhost:8080/greeting?name=SpringBoot
   

3. Attach the debugger to the running Docker image

   • Create a remote deployment in Intellij
   • Run the newly created config to attach the debugger to Docker