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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.
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Create a remote debug configuration From the main menu, select Run | Edit Configurations. and select Remote JVM Debug. and select Launch Docker Before Debug. Make sure that the ports in the Configure Docker dialog and in the remote debug configuration match.
The Docker extension currently supports debugging Node. js, Python, and . NET applications within Docker containers.
The SSH method works fine for Docker containers, too. That said, you can SSH into a Docker container using Docker's built-in docker exec . If you do not need an interactive shell, you can also use the docker attach command to connect the host's stdin and stdout to the running container and execute remote commands.
IntelliJ IDEA provides Docker support using the Docker plugin. The plugin is bundled and enabled by defaultin IntelliJ IDEA Ultimate Edition. For IntelliJ IDEA Community Edition, you need to install the Docker plugin as described in Install plugins.
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
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