Debugging with exec-maven-plugin

Question

I am using exec-maven-plugin to execute my java app and run debug from my IDE (IntelliJ) with the following setup:

<plugin>
   <groupId>org.codehaus.mojo</groupId>
   <artifactId>exec-maven-plugin</artifactId>
   <version>1.4.0</version>
   <executions>
      <execution>
        <id>exec_1</id>
        <phase>deploy</phase>
        <goals>
            <goal>java</goal>
        </goals>
      </execution>
   </executions>
   <configuration>
       <mainClass>com.myapp.app</mainClass>
   </configuration>
</plugin>

And it works very well. Then, I change my setup to execute a realistic java command line which would run the same app:

<plugin>
   <groupId>org.codehaus.mojo</groupId>
   <artifactId>exec-maven-plugin</artifactId>
   <version>3.0.0</version>
   <executions>
      <execution>
        <id>exec_1</id>
        <phase>deploy</phase>
        <goals>
            <goal>exec</goal>
        </goals>
      </execution>
   </executions>
   <configuration>
      <executable>java</executable>
       <arguments>
           <argument>-cp</argument>
           <argument>
               "dir1";"dir2;etc..."
           </argument>
           <argument>com.myapp.app</argument>
       </arguments>
   </configuration>
</plugin>

And it works to execute the application, but it does not attach the Debugger to the IDE. So, what additional argument I could add to make it catch the debug interruptions?

Why not just create a Run Configuration in IDEA and run it without Maven at all? — ZhekaKozlov, Jun 16 '20 at 04:29
or run the build up to the phase you need and continue from the command line. Use the dependency:buildclasspath goal to get your classpath — caduceus, Jan 26 '21 at 09:40

score 0 · Answer 1 · answered Jun 16 '20 at 06:43

When you launch maven goal in debug mode - you are launching debug for the Maven goal process, but you need to debug the forked by the Maven goal JVM process. For this you can either

specify the remote debug JVM options for this process like -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8000 (see this SO post) and then launch Remote Debug Configuration in IDE. See this tutorial about remote debug in IDE.
use IDE's own Run/Debug Configuration for launching and debugging the application.

Debugging with exec-maven-plugin

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