这个问题有点难呀,大家快进来看看.
我做的是一个jsf程序,程序报了以下异常,请问是怎么回事呀?
StandardWrapperValve[debugjsp]:   Servlet.service()   for   servlet   debugjsp   threw   exception

java.lang.NullPointerException

java.lang.NullPointerException

at   com.sun.faces.taglib.jsf_core.LoadBundleTag.doStartTag(LoadBundleTag.java:96)

at   org.apache.jsp.index_jsp._jspx_meth_f_loadBundle_0(index_jsp.java:95)

at   org.apache.jsp.index_jsp._jspService(index_jsp.java:65)

at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)

at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

at   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)

StandardWrapperValve[debugjsp]:   Servlet.service()   for   servlet   debugjsp   threw   exception

at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)

java.lang.NullPointerException

at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)

at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)

at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)

at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)

at   org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at   org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)

at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)

at   org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)

at   org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)

at   org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)

at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at   org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)

at   org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)

at   org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)

at   org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)

at   org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)

at   org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool