cannot start j2ee server

[vivek shenoy]

1......guys i have just started advanced java i have installed j2sdkee1.3.1 i have set all variables and path wheni start j2ee server it gives me an exception saying noClassDefFoundException please help me out .........
2....... i also tried to install j2sdk1.4 when i type start j2ee -verbose it says cannot find file j2ee please help out

the error i get is

J2EE server listen port: 1050
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/corba/se/inte
rnal/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:89
5)
at com.sun.corba.ee.internal.CosNaming.TransientNameService.initialize(T
ransientNameService.java:117)
at com.sun.corba.ee.internal.CosNaming.TransientNameService.<init>(Trans
ientNameService.java:70)
at com.sun.enterprise.iiop.POAProtocolMgr.initializeNaming(POAProtocolMg
r.java:103)
at com.sun.enterprise.server.J2EEServer.run(J2EEServer.java:226)
at com.sun.enterprise.server.J2EEServer.main(J2EEServer.java:972)
[ June 22, 2005: Message edited by: vivek shenoy ]