Question

Suppose I have a war and jar projects defined in maven.

The Jar project is dependent on the War project

I have managed to get this working in package mode by adding

In the war project <attachClasses> to true in the war plugin.

And making a dependency to

        <groupId>com</groupId>
        <artifactId>oneway-delegator</artifactId>
        <version>1.0</version>
        <classifier>classses</classifier>

in the jar pom.

But when running only compile the classes jar is not created and everything fails.

Any ideas folks ??

Answer 1

But when running only compile the classes jar is not created and everything fails.

You can indeed configure the maven-war-plugin to package/deploy the classes and resources included in your webapp as an “attached” JAR artifact with a classifier with the following configuration:

<project>
  ...
  <artifactId>mywebapp</artifactId>
  <version>1.0-SNAPSHOT</version>
  ...
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>X.Y</version>
        <configuration>
          <attachClasses>true</attachClasses>
        </configuration>
      </plugin>
    </plugins>
  </build>
  ...
</project>

But this artifact is created during the package phase so don’t expect it to be there if you run compile only.

Note that this configuration option has been introduced for a very particular use case, the skinny war use case. If you need to re-use this JAR in another project the recommended approach is in general to move the classes to a separate module that builds a JAR, and then declare a dependency on that JAR from your webapp as well as from any other projects that need it.