Question

怎么解决这个异常 java.lang.NoClassDefFoundError: javax/el/ELContextEvent

我用的是liferay6.0（tomcat6.0）,jsp页面怎么不能用el表达式输出内容？而且jstl.jar 1.2的包和jstl-impl.jar包也导入了，还是不行， 请高手指教，下面是 主要异常内容：

Caused by: org.apache.jasper.JasperException: An exception occurred processing JSP page /view.jsp at line 11

8:
9:
10: <c:forEach var="i" begin="1" end="10" step="1" >
11: ${i}
12: </c:forEach>
13:
14: <form method="post" action="<portlet:actionURL windowState="normal"/>" >

Stacktrace:
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:401)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at com.liferay.portlet.PortletRequestDispatcherImpl.dispatch(PortletRequestDispatcherImpl.java:312)
at com.liferay.portlet.PortletRequestDispatcherImpl.include(PortletRequestDispatcherImpl.java:135)
... 194 more
Caused by: javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/el/ELContextEvent
at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
at org.apache.jsp.view_jsp._jspService(view_jsp.java:164)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
... 204 more
找到原因了，javax/el/ELContextEvent在liferay-portal-6.0.0\tomcat-6.0.24\lib\el-api.jar包下，导入到自己的portlet即可

谢谢各位的回答

Answer 1

这个问题应该是你的tomcat版本和jar包版本不同造成的吧。
你看看你的工程的properties - java build path
-libraries 下面的估计有一个Java EE 5的jar包，就是它跟tomcat6有冲突，删除应该就可以了！

Answer 2

在jsp页面的头上加入 <%@ page isELIgnored ="false"%>

Answer 3

应该是支撑jar包没导入，standard的那个jar包，或者你直接将环境换成5.0……试试看