resin.conf를 아래와 같이 설정하여 실행하면

==============================================

   <host id =www.admin.com>
     <document-directory>>D:\\project\\admin\\web_root</document-directory>
       <web-app id=/>
        <class-loader>
         <simple-loader path=\"D:\\prject\\bin\"/>
        </class-loader>
       </web-app>
    </host>
    <host id =www.front.com>
     <document-directory>D:\\project\\front\\web_root</document-directory>
       <web-app id=/>
        <class-loader>
         <simple-loader path=\"D:\\prject\\bin\"/>
        </class-loader>
       </web-app>
    </host>

==============================================

아래와 같은 에러가 발생합니다.

==============================================

copyright(c) 1998-2004 Caucho Technology.  All rights reserved.

  Using Resin(R) Open Source under the GNU Public License (GPL).

  See http://www.caucho.com for information on Resin Professional,
  including caching, clustering, JNI acceleration, and OpenSSL integration.

Starting Resin on Wed, 26 Jul 2006 17:33:45 +0900 (KST)

[17:33:48.453] Server[] starting
[17:33:48.546] hmux listening to localhost:6802
[17:33:48.562] javax.management.InstanceAlreadyExistsException: resin:Server=default,name=www.front.com,type=Host
[17:33:48.562]  at com.caucho.jmx.AbstractMBeanServer.registerMBean(AbstractMBeanServer.java:427)
[17:33:48.562]  at com.caucho.jmx.Jmx.register(Jmx.java:229)
[17:33:48.562]  at com.caucho.server.deploy.EnvironmentDeployController.initEnd(EnvironmentDeployController.java:256)
[17:33:48.562]  at com.caucho.server.deploy.DeployController.init(DeployController.java:282)
[17:33:48.562]  at com.caucho.server.deploy.DeployContainer.init(DeployContainer.java:338)
[17:33:48.562]  at com.caucho.server.deploy.DeployContainer.generateController(DeployContainer.java:324)
[17:33:48.562]  at com.caucho.server.deploy.DeployContainer.startImpl(DeployContainer.java:270)
[17:33:48.562]  at com.caucho.server.deploy.DeployContainer.start(DeployContainer.java:151)
[17:33:48.562]  at com.caucho.server.host.HostContainer.start(HostContainer.java:467)
[17:33:48.562]  at com.caucho.server.resin.ServletServer.start(ServletServer.java:909)
[17:33:48.562]  at com.caucho.server.deploy.DeployController.startImpl(DeployController.java:569)
[17:33:48.562]  at com.caucho.server.deploy.AbstractDeployControllerStrategy.start(AbstractDeployControllerStrategy.java:56)
[17:33:48.562]  at com.caucho.server.deploy.DeployController.start(DeployController.java:465)
[17:33:48.562]  at com.caucho.server.resin.ResinServer.start(ResinServer.java:474)
[17:33:48.562]  at com.caucho.server.resin.Resin.init(Resin.java)
[17:33:48.562]  at com.caucho.server.resin.Resin.main(Resin.java:614)
[17:33:48.562]  at com.caucho.server.http.ResinServer.main(ResinServer.java:61)
[17:33:48.781] Host[www.front.com] starting

Resin은 3.0.15 입니다.

http://bugs.caucho.com/view.php?id=474