Unable to connect from jconsole to an application built with jlink

Question

I have written a Java 17 application that provides several MBeans. If I start the jar with a standard Java 17 SDK via java -jar myjar.jar the applications starts and I can connect to it from JConsole.

Then I have created a custom runtime image with jlink.

The application itself runs fine with this image. It gets the MBeanServer and registers successfully my MBean.

When I start Jconsole I can select the running application (as "Local Process") but then the connection to this process can't be created.

I have tried to add a number of additional modules (like jdk.management, java.management, ...) but without success. It seems that at least one module is missing because in my customer runtime image eg the DLL management_ext.dll is missng.

Any idea which modules are necessary?

Answer 1

Try use jdeps to check all modules are required in your build.

Example of listing all modules from .jar

jdeps --ignore-missing-deps --print-module-deps --multi-release 17 your-jar.jar 

Example to jlink

jlink \
    --module-path /path-with-all-jdk-modules \
    --add-modules $(jdeps --ignore-missing-deps --print-module-deps --multi-release 17 your-jar.jar ) \
    --output /path-output-jre-custom \
    --strip-debug \
    --no-header-files \
    --no-man-pages \
    --compress 2