求救!!!!!Tomcat抛出异常
我用NetBeans做visual JSF时,Tomcat抛出以下异常:

2008-5-9 0:29:28 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet Faces Servlet threw exception
java.lang.NullPointerException
at com.sun.faces.application.ApplicationImpl.createValueBinding(ApplicationImpl.java:467)
at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.pageBean(ViewHandlerImpl.java:697)
at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.pageBean(ViewHandlerImpl.java:676)
at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.java:284)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.render(PartialTraversalLifecycle.java:106)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.sun.webui.jsf.util.UploadFilter.doFilter(UploadFilter.java:267)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

我看了半天也看不明白呀,各位大侠,救救小弟呀!!!!


------解决方案--------------------
看不懂，JSF经常看到这种异常问题，估计还是配置文件的问题。 具体的不知道了.
从异常里啥也看不出
------解决方案--------------------
空指针吧,你看看是怎么引起这个错误的.