远程调用websphere的ejb时老提示找不到是什么原因啊？？

我写的测试代码
<%
Properties h = new Properties();
h.put(Context.INITIAL_CONTEXT_FACTORY,"com.ibm.websphere.naming.WsnInitialContextFactory");
h.put(Context.PROVIDER_URL,"iiop://202.96.3.143");
//h.put(PROPS.JNDI_CACHE_OBJECT,PROPS.JNDI_CACHE_OBJECT_CLEARED);
//h.put(PROPS.NAME_SYNTAX, PROPS.NAME_SYNTAX_INS);
InitialContext ctx1 = new InitialContext(h);
System.out.println(1234);
out.println(ctx1.lookup("java:comp/env/jdbc/WorkFlow"));
%>

错误：

05-3-15 16:40:43:938 CST] 73633641 WebGroup E SRVE0026E: ［Servlet 错误］－［Name comp/env/jdbc not found in context "java:".］：javax.naming.NameNotFoundException: Name comp/env/jdbc not found in context "java:".
at com.ibm.ws.naming.ipbase.NameSpace.getParentCtxInternal(NameSpace.java:1638)
at com.ibm.ws.naming.ipbase.NameSpace.lookupInternal(NameSpace.java:997)
at com.ibm.ws.naming.ipbase.NameSpace.lookup(NameSpace.java:920)
at com.ibm.ws.naming.urlbase.UrlContext.lookup(UrlContext.java:1211)
at com.ibm.ws.naming.urlbase.UrlContext.lookup(UrlContext.java:1203)
at com.ibm.ws.naming.urlbase.UrlContext.lookup(UrlContext.java:1257)
at javax.naming.InitialContext.lookup(InitialContext.java:359)
at org.apache.jsp._te._jspService(_te.java:88)
at com.ibm.ws.webcontainer.jsp.runtime.HttpJspBase.service(HttpJspBase.java:89)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.jsp.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:357)
at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.serviceJspFile(JspServlet.java:675)
at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.service(JspServlet.java:773)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:948)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:530)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:176)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:79)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:201)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:114)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:186)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:610)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:431)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:593)