菜鸟求助：JSTL的x标签部分使用时总是报错

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"%> <%@ taglib prefix="x" uri="http://java.sun.com/jstl/xml"%> <%@ page contenttype="text/html; charset=gb2312" language="java" %> test1 test2 错误是： message description the server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.servletexception: cannot inherit from final class org.apache.jasper.runtime.pagecontextimpl.handlepageexception(pagecontextimpl.java:682) org.apache.jsp.jstl.x_005fparse_jsp._jspservice(x_005fparse_jsp.java:81) org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:136) javax.servlet.http.httpservlet.service(httpservlet.java:856) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:320) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:293) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:240) javax.servlet.http.httpservlet.service(httpservlet.java:856) root cause java.lang.verifyerror: cannot inherit from final class java.lang.classloader.defineclass0(native method) java.lang.classloader.defineclass(classloader.java:502) java.security.secureclassloader.defineclass(secureclassloader.java:123) org.apache.catalina.loader.webappclassloader.findclassinternal(webappclassloader.java:1656) org.apache.catalina.loader.webappclassloader.findclass(webappclassloader.java:891) org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1340) org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1220) java.lang.classloader.loadclassinternal(classloader.java:315) org.apache.taglibs.standard.tag.common.xml.exprsupport.dostarttag(exprsupport.java:63) org.apache.taglibs.standard.tag.el.xml.exprtag.dostarttag(exprtag.java:62) org.apache.jsp.jstl.x_005fparse_jsp._jspx_meth_x_out_0(x_005fparse_jsp.java:148) org.apache.jsp.jstl.x_005fparse_jsp._jspservice(x_005fparse_jsp.java:71) org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:136) javax.servlet.http.httpservlet.service(httpservlet.java:856) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:320) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:293) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:240) javax.servlet.http.httpservlet.service(httpservlet.java:856) note the full stack trace of the root cause is available in the tomcat logs.