Weblogism

The dependencies in a JBoss ear file go into the lib folder at the root of the archive;

<plugin>
  <artifactId>maven-ear-plugin</artifactId>
  <version>2.5</version>
  <configuration>
    <defaultLibBundleDir>lib</defaultLibBundleDir>
    <modules>
      <ejbModule>
        <groupId>com.example.core</groupId>
        <artifactId>core-business</artifactId>
      </ejbModule>
      <webModule>
        <groupId>${project.parent.groupId}</groupId>
        <artifactId>example-web</artifactId>
        <uri>mydnb-web.war</uri>
      </webModule>
    </modules>
    <jboss>
      <version>5</version>
      <loader-repository>${project.parent.groupId}:archive=example-ear.ear</loader-repository>
    </jboss>
  </configuration>
</plugin>

defaultLibBundleDir ensures that the dependencies get copied into the lib folder, whilst leaving the modules core-business and example-web.war at the root.