java.lang.NoClassDefFoundError: javax/el/ELResolver解决方案

最新推荐文章于 2020-06-30 23:27:36 发布

吴声子夜歌

最新推荐文章于 2020-06-30 23:27:36 发布

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分类专栏： IDE 文章标签： java servlet

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本文解决了一个常见的Java EE问题，即在使用Apache Tomcat服务器时出现的NoClassDefFoundError异常，详细介绍了错误的原因及如何通过在Java安装目录的jrelibext下放置el-api.jar文件来解决此问题。

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报错如下

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:717)

root cause

java.lang.NoClassDefFoundError: javax/el/ELResolver java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClass(ClassLoader.java:621) java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) java.net.URLClassLoader.defineClass(URLClassLoader.java:260) java.net.URLClassLoader.access$000(URLClassLoader.java:56) java.net.URLClassLoader$1.run(URLClassLoader.java:195) java.security.AccessController.doPrivileged(Native Method) java.net.URLClassLoader.findClass(URLClassLoader.java:188) sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229) java.lang.ClassLoader.loadClass(ClassLoader.java:307) java.lang.ClassLoader.loadClass(ClassLoader.java:300) sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) java.lang.ClassLoader.loadClass(ClassLoader.java:300) java.lang.ClassLoader.loadClass(ClassLoader.java:252) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) org.apache.jasper.runtime.JspFactoryImpl.getJspApplicationContext(JspFactoryImpl.java:209) org.apache.jsp.NewFile_jsp._jspInit(NewFile_jsp.java:22) 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:717)

root cause

java.lang.ClassNotFoundException: javax.el.ELResolver java.net.URLClassLoader$1.run(URLClassLoader.java:200) java.security.AccessController.doPrivileged(Native Method) java.net.URLClassLoader.findClass(URLClassLoader.java:188) sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229) java.lang.ClassLoader.loadClass(ClassLoader.java:307) java.lang.ClassLoader.loadClass(ClassLoader.java:252) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClass(ClassLoader.java:621) java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) java.net.URLClassLoader.defineClass(URLClassLoader.java:260) java.net.URLClassLoader.access$000(URLClassLoader.java:56) java.net.URLClassLoader$1.run(URLClassLoader.java:195) java.security.AccessController.doPrivileged(Native Method) java.net.URLClassLoader.findClass(URLClassLoader.java:188) sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229) java.lang.ClassLoader.loadClass(ClassLoader.java:307) java.lang.ClassLoader.loadClass(ClassLoader.java:300) sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) java.lang.ClassLoader.loadClass(ClassLoader.java:300) java.lang.ClassLoader.loadClass(ClassLoader.java:252) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) org.apache.jasper.runtime.JspFactoryImpl.getJspApplicationContext(JspFactoryImpl.java:209) org.apache.jsp.NewFile_jsp._jspInit(NewFile_jsp.java:22) 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:717)