启动j2ee服务器NoClassDefFoundError错误!

[Pol]

我配置好J2EE环境变量后,运行j2ee ?/显示如下:
C:\Documents and Settings\Administrator>j2ee ?/
Java 2 Enterprise Edition Server
Options:
-verbose Redirect all logging output to the current shell.
-help Print this help message.
-version Print the version.
-stop Stop the J2EE server.
C:\Documents and Settings\Administrator>
这说明我的环境配置没有问题,但我启动服务器时出现以下错误,
C:\Documents and Settings\Administrator>j2ee -verbose
J2EE server listen port: 1050
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/corba/se/internal/util/IdentityHashtable
at com.sun.corba.ee.internal.javax.rmi.CORBA.Util.<clinit>(Util.java:87)
at com.sun.corba.ee.internal.POA.POAImpl.activate(POAImpl.java:935)
at com.sun.corba.ee.internal.POA.POAImpl.activate_object(POAImpl.java:895)
at com.sun.corba.ee.internal.CosNaming.TransientNameService.initialize(TransientNameService.java:117)
at com.sun.corba.ee.internal.CosNaming.TransientNameService.<init>(TransientNameService.java:70)
at com.sun.enterprise.iiop.POAProtocolMgr.initializeNaming(POAProtocolMgr.java:103)
at com.sun.enterprise.server.J2EEServer.run(J2EEServer.java:226)
at com.sun.enterprise.server.J2EEServer.main(J2EEServer.java:972)
请问这是怎么回事,如何解决了.我在网上找了很久还是没有解决,,....
急先待回答了.