HTTP Status 500 - java.lang.NoClassDefFoundError: javax/el/ELResolver

type Exception report

message java.lang.NoClassDefFoundError: javax/el/ELResolver

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/el/ELResolver

	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:268)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

root cause

java.lang.NoClassDefFoundError: javax/el/ELResolver

	java.lang.ClassLoader.defineClass1(Native Method)

	java.lang.ClassLoader.defineClass(ClassLoader.java:800)

	java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

	java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

	java.net.URLClassLoader.access$100(URLClassLoader.java:71)

	java.net.URLClassLoader$1.run(URLClassLoader.java:361)

	java.net.URLClassLoader$1.run(URLClassLoader.java:355)

	java.security.AccessController.doPrivileged(Native Method)

	java.net.URLClassLoader.findClass(URLClassLoader.java:354)

	java.lang.ClassLoader.loadClass(ClassLoader.java:425)

	java.lang.ClassLoader.loadClass(ClassLoader.java:412)

	sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

	java.lang.ClassLoader.loadClass(ClassLoader.java:412)

	java.lang.ClassLoader.loadClass(ClassLoader.java:358)

	org.apache.jasper.runtime.JspFactoryImpl.getJspApplicationContext(JspFactoryImpl.java:209)

	org.apache.jsp.login_jsp._jspInit(login_jsp.java:23)

	org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)

	org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:164)

	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:340)

	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

root cause

java.lang.ClassNotFoundException: javax.el.ELResolver

	java.net.URLClassLoader$1.run(URLClassLoader.java:366)

	java.net.URLClassLoader$1.run(URLClassLoader.java:355)

	java.security.AccessController.doPrivileged(Native Method)

	java.net.URLClassLoader.findClass(URLClassLoader.java:354)

	java.lang.ClassLoader.loadClass(ClassLoader.java:425)

	java.lang.ClassLoader.loadClass(ClassLoader.java:358)

	java.lang.ClassLoader.defineClass1(Native Method)

	java.lang.ClassLoader.defineClass(ClassLoader.java:800)

	java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

	java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

	java.net.URLClassLoader.access$100(URLClassLoader.java:71)

	java.net.URLClassLoader$1.run(URLClassLoader.java:361)

	java.net.URLClassLoader$1.run(URLClassLoader.java:355)

	java.security.AccessController.doPrivileged(Native Method)

	java.net.URLClassLoader.findClass(URLClassLoader.java:354)

	java.lang.ClassLoader.loadClass(ClassLoader.java:425)

	java.lang.ClassLoader.loadClass(ClassLoader.java:412)

	sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

	java.lang.ClassLoader.loadClass(ClassLoader.java:412)

	java.lang.ClassLoader.loadClass(ClassLoader.java:358)

	org.apache.jasper.runtime.JspFactoryImpl.getJspApplicationContext(JspFactoryImpl.java:209)

	org.apache.jsp.login_jsp._jspInit(login_jsp.java:23)

	org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)

	org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:164)

	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:340)

	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.44 logs.

解决办法：到apache-tomcat/lib目录下，拷贝el-api.jar放到D:\Java\jdk1.6.0_11\jre\lib\ext下，重启Tomcat服务器重试即可。

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