跑jsf,环境：JBuilder2005+Weblogic8.1,出现如下异常
Error 500--Internal Server Error
javax.servlet.jsp.JspException: Cannot find FacesContext
at javax.faces.webapp.UIComponentTag.doStartTag()I(UIComponentTag.java:399)
at com.sun.faces.taglib.jsf_core.ViewTag.doStartTag()I(ViewTag.java:105)
at jsp_servlet.__index._jspService(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)V(__index.java:144)
at weblogic.servlet.jsp.JspBase.service(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;)V(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava.lang.Object;(ServletStubImpl.java:1006)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;Lweblogic.servlet.internal.FilterChainImpl;)V(ServletStubImpl.java:419)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;)V(ServletStubImpl.java:315)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run()Ljava.lang.Object;(WebAppServletContext.java:6718)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic.security.subject.AbstractSubject;Ljava.security.PrivilegedAction;)Ljava.lang.Object;(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.acl.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSubject;Ljava.security.PrivilegedAction;)Ljava.lang.Object;(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(Lweblogic.servlet.internal.ServletRequestImpl;Lweblogic.servlet.internal.ServletResponseImpl;)V(WebAppServletContext.java:3764)
at weblogic.servlet.internal.ServletRequestImpl.execute(Lweblogic.kernel.ExecuteThread;)V(ServletRequestImpl.java:2644)
at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest;)V(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178)
at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Source)