request.getRequestDispatcher("/a.jsp").forward(req, res)异常，在线等
我看后台日志显示在之执行request.getRequestDispatcher("/location.jsp").forward(request, response)时报了异常。
org.apache.jasper.JasperException
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:460)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:399)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
at com.mocha.netfocus.service.impl.DanymicServiceImpl.forward(Unknown Source)
at com.mocha.netfocus.service.impl.IpMacServiceImpl.browseMacPortFromRealTimeTable(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.mocha.netfocus.service.impl.DanymicServiceImpl.dispatchMethod(Unknown Source)
at com.mocha.netfocus.service.impl.DanymicServiceImpl.execute(Unknown Source)
at com.mocha.netfocus.service.ServiceDelegate.execute(Unknown Source)
at com.mocha.netfocus.http.NetFocusControlServlet.doPost(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.mocha.netfocus.http.NetfocusAuditlogFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.mocha.netfocus.http.PurviewFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)

at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)
折腾了半天，也没有弄清楚解决办法。
请大家帮忙分析分析下。谢谢！

[解决办法]
org.apache.jasper.JasperException
这个应该是JSP引擎解析jsp页面生成servlet代码时产生的异常
把你的location.jsp 贴出来看看

还有 ("/location.jsp") 绝对路径能找到吗
[解决办法]
确定找到具体是servlet方法了》
[解决办法]
request.getRequestDispatcher("/location.jsp").forward(request, response);
看看改成
request.getRequestDispatcher("/location.jsp").forward(request, response);
去掉那个/试试！
[解决办法]
应该是JSP引擎解析jsp页面生成servlet代码时产生的异常，应该是你的location.jsp页面中语法有问题，而不是执行期间的问题，你看看具体的异常堆栈里面提示的有响应的信息。
[解决办法]
location.jsp 这个页面有问题