Debugging Java application on Docker

Question

I have an issue that I am investigating in a Java application that is hosted in a Docker service. The application is a REST API that has it's own docker service

I have added extra logging and looked into the service logs as well as exec-ing into the container and looking at logs there, but that only gets me to a certain point.

Is there any way to attach a remote debugger, or something similar so that I can step through the code of the application?

Look into stackoverflow.com/questions/975271/… but note that you shouldn’t do this in production — Roy Shahaf
– Roy Shahaf, Commented Sep 11, 2018 at 10:59
Depending on the container you are using you should change the command started by the container. Usually you can add parameters passing the JAVA_OPT environment variable. Can you provide some more info about the container? — Gianluca Mereu
– Gianluca Mereu, Commented Sep 11, 2018 at 13:00
@GianlucaMereu My application is deployed using a docker compose file with three different services defined. One of these services is the one which I would like to debug. — colmulhall
– colmulhall, Commented Sep 11, 2018 at 14:54
Check this link for detailed steps Visit <stackoverflow.com/a/61660010/1734444>? — Rachangouda Patil
– Rachangouda Patil, Commented May 7, 2020 at 14:18

Tomáš Mika · Accepted Answer · 2019-01-21 15:19:03Z

4

Dockerfile e.g.:

FROM openjdk:11.0.1-jdk
VOLUME /tmp
COPY build/libs/*.jar app.jar
EXPOSE 5005
EXPOSE 8080
ENTRYPOINT ["java", "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005", "-Dspring.profiles.active=localdocker","-jar","/app.jar"]

then connect by remote debugger from Idea or Eclipse

answered Jan 21, 2019 at 15:19

Tomáš Mika

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Anurag Over a year ago

This works. I was missing * in address=*:5005. Thanks!

TheAppFoundry · Accepted Answer · 2021-06-03 14:05:00Z

1

You can also leave your docker file the same if you do something like:

VOLUME /tmp
COPY build/libs/*.jar app.jar
EXPOSE 8080
ENTRYPOINT ["java"]
CMD ["-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005", "-Dspring.profiles.active=localdocker","-jar","/app.jar"]

And then on the terminal pass the neccessary arguments

docker run -p 5005:5005 <my-container> -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005, -Dspring.profiles.active=localdocker,-jar,/app.jar

This is the documentation for the connection options for jdwp. https://docs.oracle.com/javase/7/docs/technotes/guides/jpda/conninv.html#Transports

answered Jun 3, 2021 at 14:05

TheAppFoundry

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