我使用sitemesh来装饰页面.我正在使用JSP页面.页面工作正常,直到我使用<c:if>条件标签.我在WEB-INF/lib文件夹中有jstl-impl-1.2.jar和sitemesh-3.0-alpha-1.jar文件.我在jsp页面中有以下标记库声明:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %>
我正在使用带有java 6的tomcat 7.0.当我在eclipse中创建新的动态Web项目时,我将动态Web模块版本设置为2.4.页面有<c:set/>标签,它们工作正常,但是当我使用if条件标签时,我收到以下错误:
javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupport
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:342)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.sitemesh.webapp.WebAppContext.dispatch(WebAppContext.java:158)
org.sitemesh.webapp.WebAppContext.decorate(WebAppContext.java:133)
org.sitemesh.BaseSiteMeshContext.decorate(BaseSiteMeshContext.java:39)
org.sitemesh.webapp.SiteMeshFilter.postProcess(SiteMeshFilter.java:74)
org.sitemesh.webapp.contentfilter.ContentBufferingFilter.bufferAndPostProcess(ContentBufferingFilter.java:175)
org.sitemesh.webapp.contentfilter.ContentBufferingFilter.doFilter(ContentBufferingFilter.java:126)
org.sitemesh.config.ConfigurableSiteMeshFilter.doFilter(ConfigurableSiteMeshFilter.java:157)
root cause
java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupport
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClassCond(Unknown Source)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2820)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1150)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1223)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1450)
org.apache.jasper.compiler.Parser.parse(Parser.java:138)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:644)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.sitemesh.webapp.WebAppContext.dispatch(WebAppContext.java:158)
org.sitemesh.webapp.WebAppContext.decorate(WebAppContext.java:133)
org.sitemesh.BaseSiteMeshContext.decorate(BaseSiteMeshContext.java:39)
org.sitemesh.webapp.SiteMeshFilter.postProcess(SiteMeshFilter.java:74)
org.sitemesh.webapp.contentfilter.ContentBufferingFilter.bufferAndPostProcess(ContentBufferingFilter.java:175)
org.sitemesh.webapp.contentfilter.ContentBufferingFilter.doFilter(ContentBufferingFilter.java:126)
org.sitemesh.config.ConfigurableSiteMeshFilter.doFilter(ConfigurableSiteMeshFilter.java:157)
root cause
java.lang.ClassNotFoundException: …