If you need to unpack artifacts in the generated EAR, you can configure it in two ways:
Note that artifacts are unpacked according to their respective URI.
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-ear-plugin</artifactId>
        <version>2.10.1</version>
        <configuration>
          <modules>
            <sarModule>
              <groupId>artifactGroupId</groupId>
              <artifactId>artifactId</artifactId>
              <unpack>true</unpack>
            </sarModule>
          </modules>
        </configuration>
      </plugin>
    </plugins>
  </build>  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-ear-plugin</artifactId>
        <version>2.10.1</version>
        <configuration>
          <unpackTypes>rar,war,ejb</unpackTypes>
          [...]
        </configuration>
      </plugin>
    </plugins>
  </build>