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  1. ,

    If JVM throws ClassNotFoundException the class is not found in classpath. It means that something is not configured correctly. So check the relevant class is in the classpath. If the class is packaged into a jar, the jar should also in the classpath.

  2. ,

    If JVM throws ClassNotFoundException the class is not found in classpath. It means that something isn't configured correctly. So check whether the class is in the classpath. If this class is packaged to a jar file. Then the jar must also be in the lib path

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org.apache.commons.lang.UnhandledException org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
java.lang.ClassNotFoundException: org.apache.commons.lang.UnhandledException	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)	at java.lang.Class.getDeclaredConstructors0(Native Method)	at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)	at java.lang.Class.getConstructor0(Unknown Source)	at java.lang.Class.newInstance0(Unknown Source)	at java.lang.Class.newInstance(Unknown Source)	at java.beans.Introspector.instantiate(Unknown Source)	at java.beans.Introspector.findExplicitBeanInfo(Unknown Source)	at java.beans.Introspector.(Unknown Source)	at java.beans.Introspector.getBeanInfo(Unknown Source)	at org.apache.jasper.compiler.Generator$TagHandlerInfo.(Generator.java:3911)	at org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2174)	at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1632)	at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1530)	at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)	at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)	at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)	at org.apache.jasper.compiler.Node$Root.accept(Node.java:495)	at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)	at org.apache.jasper.compiler.Generator.generate(Generator.java:3461)	at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:231)	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:321)	at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)	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.processRequest(ApplicationDispatcher.java:436)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)	at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)	at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	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.processRequest(ApplicationDispatcher.java:436)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)	at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:709)	at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:680)	at org.apache.jsp.index_jsp._jspService(index_jsp.java:56)	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:388)	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.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Unknown Source)