不知道是JSF的bug还是JBoss的Bug
在JBoss（版本为3.2.3和jboss-4.0.4.GA）上运行JSF的时候，会出现以下错误（在TOMCAT上运行完全正常），然后在GOOGLE上搜索，在JBoss的官方论坛上发现解决方案，就是把页面上的两个JSF taglib都改成WEB-INF/html_basic.tld、WEB-INF/jsf_core.tld就正常了。但在有的版本里却运行正常，如（3.2.5）。
11:31:25,062 ERROR [UIComponentTag] Faces context not found. getResponseWriter w
ill fail. Check if the FacesServlet has been initialized at all in your web.xml.
11:31:25,062 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at javax.faces.webapp.UIComponentTag.setupResponseWriter(UIComponentTag.
java:615)
at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:217)
at org.apache.myfaces.taglib.core.ViewTag.doStartTag(ViewTag.java:71)
at org.apache.jsp.index_jsp._jspx_meth_f_view_0(index_jsp.java:123)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:99)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:332)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
14)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(Applica
tionDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationD
ispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDis
patcher.java:301)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImp
l.java:322)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.
java:147)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePha
se.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(Exte
nsionsFilter.java:112)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:175)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:74)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
at java.lang.Thread.run(Thread.java:595)