开发阶段Jetty运行Jsp报错且响应空白
现在比较流行用jetty作为启动服务器做开发， 简单且方便； 一直用的是Jetty8 没出现过奇怪问题， 刚好在另外的工程的时候用到了Jetty6版本。 问题出现了 后来解决了是jar包问题， 记录一下以后遇到更有印象；
错误：

2014-03-06 14:02:21.419:org.apache.jasper.runtime.JspFactoryImpl:WARN: Exception initializing page context 
java.lang.VerifyError: (class: org/apache/jasper/runtime/PageContextImpl, method: getELResolver signature: ()Ljavax/el/ELResolver;) Incompatible argument to function
at org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:128)
at org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:81)
at org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:36)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:80)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:464)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:358)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:367)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:268)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at org.mortbay.jetty.servlet.DefaultServlet.doGet(DefaultServlet.java:431)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1098)
at com.mayland.util.http.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:45)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
at com.mayland.util.http.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:45)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:285)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:502)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:821)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:208)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:378)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:368)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)

页面结果：
【空--------------白】
解决办法：
把Jetty相关的包在lib目录下另外简历目录（名字任意） 列如：lib–>jetty_lib。 重新运行问题解决！