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Please try to help me i was trying to learn struts  RSS feed

 
Greenhorn
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in my struts application problem with display tag

HTTP Status 500 - java.lang.NoClassDefFoundError: org/apache/commons/lang/UnhandledException

type Exception report

message java.lang.NoClassDefFoundError: org/apache/commons/lang/UnhandledException

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

exception

javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/commons/lang/UnhandledException
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:343)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.lang.NoClassDefFoundError: org/apache/commons/lang/UnhandledException
java.lang.Class.getDeclaredConstructors0(Native Method)
java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
java.lang.Class.getConstructor0(Class.java:2699)
java.lang.Class.newInstance0(Class.java:326)
java.lang.Class.newInstance(Class.java:308)
java.beans.Introspector.instantiate(Introspector.java:1439)
java.beans.Introspector.findExplicitBeanInfo(Introspector.java:410)
java.beans.Introspector.<init>(Introspector.java:359)
java.beans.Introspector.getBeanInfo(Introspector.java:159)
org.apache.jasper.compiler.Generator$TagHandlerInfo.<init>(Generator.java:3971)
org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2226)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1654)
org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1538)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2427)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2433)
org.apache.jasper.compiler.Node$Root.accept(Node.java:474)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
org.apache.jasper.compiler.Generator.generate(Generator.java:3517)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
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:646)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.lang.ClassNotFoundException: org.apache.commons.lang.UnhandledException
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
java.lang.Class.getDeclaredConstructors0(Native Method)
java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
java.lang.Class.getConstructor0(Class.java:2699)
java.lang.Class.newInstance0(Class.java:326)
java.lang.Class.newInstance(Class.java:308)
java.beans.Introspector.instantiate(Introspector.java:1439)
java.beans.Introspector.findExplicitBeanInfo(Introspector.java:410)
java.beans.Introspector.<init>(Introspector.java:359)
java.beans.Introspector.getBeanInfo(Introspector.java:159)
org.apache.jasper.compiler.Generator$TagHandlerInfo.<init>(Generator.java:3971)
org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2226)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1654)
org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1538)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2427)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2433)
org.apache.jasper.compiler.Node$Root.accept(Node.java:474)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
org.apache.jasper.compiler.Generator.generate(Generator.java:3517)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
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:646)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
 
Saloon Keeper
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Is the class in question in a jar file that's accessible by your web app, and is the jar file intact? How have you checked both? (implying that if you haven't yet, that's what you should start with)
 
It is sorta covered in the JavaRanch Style Guide.
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