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TOMCAT有关问题;严重: Servlet.service() for servlet jsp threw exception

热度:605   发布时间:2016-04-17 14:09:41.0
TOMCAT问题;严重: Servlet.service() for servlet jsp threw exception
我在JSP中用了struts标签,出现如下状况:
严重:   Servlet.service()   for   servlet   jsp   threw   exception
javax.servlet.jsp.JspException:   No   selector   attribute   (cookie/header/name/parameter)   was   specified
at   org.apache.struts.taglib.logic.PresentTag.condition(PresentTag.java:163)
at   org.apache.struts.taglib.logic.NotPresentTag.condition(NotPresentTag.java:93)
at   org.apache.struts.taglib.logic.ConditionalTagBase.doStartTag(ConditionalTagBase.java:218)
at   org.apache.jsp.Welcome_jsp._jspx_meth_logic_notPresent_0(org.apache.jsp.Welcome_jsp:203)
at   org.apache.jsp.Welcome_jsp._jspService(org.apache.jsp.Welcome_jsp:97)
at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at   org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at   org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at   org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at   org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at   org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at   org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at   java.lang.Thread.run(Thread.java:595)



------解决方案--------------------
用logic标签测试一下list对象是否存在
List list = ?????????
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