Remote debugging Java 9 in a docker container from IntelliJ IDEA

Question

I have a Dockerfile with this content:

FROM openjdk:9

WORKDIR /project

ADD . /project

EXPOSE 5005

My docker-compose.yml looks like this:

version: "3.2"
services:
  some-project:
    build: .
    ports:
      - target: 5005
        published: 5005
        protocol: tcp
        mode: host
  command: "java '-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005' SomeClass"

When I do docker-composer up I see a message "Listening for transport dt_socket at address: 5005". But when I try to connect with jdb or Idea I get "java.io.IOException: handshake failed - connection prematurally closed".

Everything works fine if I change openjdk:9 to openjdk:8. However, I need Java 9 for my project.

Check this for the detailed steps stackoverflow.com/a/61660010/1734444 — Rachangouda Patil
– Rachangouda Patil, Commented May 7, 2020 at 14:17

Jorrit Posthuma · Accepted Answer · 2017-12-12 12:13:31Z

58

From Java 9, the JDWP socket connector accept only local connections by default. See: http://www.oracle.com/technetwork/java/javase/9-notes-3745703.html#JDK-8041435

So, to enable debug connections from outside, specify *:<port> as address:

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

answered Dec 12, 2017 at 12:13

Jorrit Posthuma

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4 Comments

Mikkel Løkke Over a year ago

Thanks, this worked for me, not sure why this isn't the accepted answer.

redwulf Over a year ago

Didn't work for me. Not sure what I'm doing wrong here. I have specified a debug port on my process (running inside a docker container) and I am exposing the port on my docker-compose. What am I missing?

Fabian Braun Over a year ago

You might need to run docker-compose up --build to rebuild your image once you've fixed the CMD

Ahmed Abdelhak Over a year ago

if I am using docker-compose.yml file and the service I want to debug uses a port mapping 8084:8080, do I need to change the port 5005 to 8084 in the debug configuration window ? and of course, i need to build the image and run docker-compose up, before I start a debug session, right ?

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