[javax.servlet.ServletException: java.lang.NullPointerException]

2013-12-5 11:15:46 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [jsp] in context with path [/module-linkman] threw exception [javax.servlet.ServletException: java.lang.NullPointerException] with root causejava.lang.NullPointerException    at org.apache.tomcat.util.http.parser.HttpParser.parseMediaType(HttpParser.java:217)    at org.apache.tomcat.util.http.parser.MediaTypeCache.parse(MediaTypeCache.java:54)    at org.apache.catalina.connector.Response.setContentType(Response.java:805)    at org.apache.catalina.connector.ResponseFacade.setContentType(ResponseFacade.java:245)    at org.apache.jsp.pages.sgllinkman.addSglGroup_jsp._jspService(addSglGroup_jsp.java:61)    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)    at com.chinaboxun.module.linkman.filter.SessionFilter.doFilter(SessionFilter.java:101)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)    at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:314)    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)    at java.lang.Thread.run(Thread.java:619)

情况是这样的，一个父页面index.jsp其中的page指令为：

XML/HTML code

?

1

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

子页面addSglGroup.jsp的page指令：

XML/HTML code

?

1

<%@ page language="java" contentType="text/html;" pageEncoding="UTF-8"%>

当点击打开这个子页面addSglGroup.jsp的时候提示上面贴出的错误。可把我找死了，利用删除代码各个排除的方法，发现了这个page指令有问题，果然去掉子页面的contentType="text/html;"过后页面正常打开了。原来以为是不能加contentType指令，到后来才知道原来这个指令里面不能加分号";"。

去掉contentType="text/html;"或者去掉分号contentType="text/html"就解决了