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1、错误描述
2014-7-13 17:20:50 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [jsp] in context with path [/FirstSSH] threw exception [/pages/student.jsp (line: 3, column: 0) /pages/pathTags.jsp (line: 1, column: 59) Attempt to redefine the prefix c to http://java.sun.com/jstl/core, when it was already defined as http://java.sun.com/jsp/jstl/core in the current scope.] with root causeorg.apache.jasper.JasperException: /pages/student.jsp (line: 3, column: 0) /pages/pathTags.jsp (line: 1, column: 59) Attempt to redefine the prefix c to http://java.sun.com/jstl/core, when it was already defined as http://java.sun.com/jsp/jstl/core in the current scope. at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42) at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443) at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:89) at org.apache.jasper.compiler.Parser.processIncludeDirective(Parser.java:324) at org.apache.jasper.compiler.Parser.parseIncludeDirective(Parser.java:357) at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:467) at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1427) at org.apache.jasper.compiler.Parser.parse(Parser.java:138) at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242) at org.apache.jasper.compiler.ParserController.parse(ParserController.java:102) at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:373) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:353) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340) at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:657) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357) 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:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2441) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2430) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)2、错误原因
页面中引入：
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ include file="pathTags.jsp"%> pathTags.jsp：
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> <%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %> <%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql" %> <%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %> <%@ taglib prefix="m" uri="http://java.sun.com/jsp/jstl/functions" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <c:set var="bp" value="<%=basePath%>"></c:set> <c:set var="pa" value="<%=path%>"></c:set> 出现“<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> ”多次被引入到页面，出现重复
3、解决办法
去掉页面中的“<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> ”
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