client JNDI Lookup Problem on linux,Solaris (win is fine)

hi all,
i have strange problem.
i have standalone client with wlsclient.jar into my classpath.
when client is on windows everything works fine, but on solaris and linux i got this error :

Apr 10, 2008 10:41:02 AM com.sun.corba.se.impl.encoding.CDRInputStream_1_0 read_value
WARNING: "IOP00810257: (MARSHAL) Could not find class"
org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 257 completed: Maybe
     at com.sun.corba.se.impl.logging.ORBUtilSystemException.couldNotFindClass(ORBUtilSystemException.java:7756)
     at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1013)
     at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:879)
     at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_abstract_interface(CDRInputStream_1_0.java:873)
     at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_abstract_interface(CDRInputStream_1_0.java:863)
     at com.sun.corba.se.impl.encoding.CDRInputStream.read_abstract_interface(CDRInputStream.java:269)
     at com.sun.corba.se.impl.util.Utility.readAbstractAndNarrow(Utility.java:948)
     at com.sun.corba.se.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1986)
     at com.sun.corba.se.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2213)
     at com.sun.corba.se.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1221)
     at com.sun.corba.se.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:400)
     at com.sun.corba.se.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:327)
     at com.sun.corba.se.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:293)
     at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1034)
     at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:879)
     at com.sun.corba.se.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:249)
     at com.sun.corba.se.impl.corba.TCUtility.unmarshalIn(TCUtility.java:269)
     at com.sun.corba.se.impl.corba.AnyImpl.read_value(AnyImpl.java:559)
     at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:739)
     at com.sun.corba.se.impl.encoding.CDRInputStream.read_any(CDRInputStream.java:220)
     at weblogic.corba.cos.naming._NamingContextAnyStub.resolve_any(_NamingContextAnyStub.java:81)
     at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:208)
     at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:168)
     at javax.naming.InitialContext.lookup(InitialContext.java:351)
     at client.TestClient1.main(TestClient1.java:40)
Caused by: java.lang.ClassNotFoundException
     ... 24 more

i tried to use all versions of java : sun java 5.0, 6.0, jrockit 5.0, 6.0
also i tried to use jrockit realtime java, but result did not changed.

on windows works but on linux and solaris not.
client classpath is the same for windows, linux and sun solaris..

can anybody help me ?
any idea will be appreciated.

Regards
Paata.