<pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.codehaus.mojo</groupId>
          <artifactId>exec-maven-plugin</artifactId>
          <version>1.4.0</version>
          <executions>
            <execution>
                <goals>
                    <goal>java</goal>
                </goals>
            </execution>
        </executions>
          <configuration>
            <cleanupDaemonThreads>false</cleanupDaemonThreads>
            <mainClass>com.MyMainClass</mainClass>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>