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我在 Objectweb Lomboz eclipse 版本 3.3 的 Struts 中尝试了分页。但我得到一个“找不到类”的错误。

错误是
例外 

javax.servlet.ServletException: org/apache/commons/lang/UnhandledException
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:272)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
    org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
    org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
    org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
    org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

根本原因 

java.lang.NoClassDefFoundError: org/apache/commons/lang/UnhandledException
    java.lang.Class.getDeclaredConstructors0(Native Method)
    java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
    java.lang.Class.getConstructor0(Unknown Source)
    java.lang.Class.newInstance0(Unknown Source)
    java.lang.Class.newInstance(Unknown Source)
    java.beans.Introspector.instantiate(Unknown Source)
    java.beans.Introspector.findExplicitBeanInfo(Unknown Source)
    java.beans.Introspector.<init>(Unknown Source)
    java.beans.Introspector.getBeanInfo(Unknown Source)
    org.apache.jasper.compiler.Generator$TagHandlerInfo.<init>(Generator.java:3728)
    org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2130)
    org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1599)
    org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1441)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
    org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
    org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
    org.apache.jasper.compiler.Generator.generate(Generator.java:3320)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
    org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
    org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
    org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
    org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

我不知道代码有什么问题。我从viralpatel.net 复制了它。我感觉此代码仅适用于 struts 2。因此，如果您有任何适用于 struts 1.2.9 的分页程序，请在答案中提供。

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1 回答 1

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请检查错误的根本原因。它明确指出：

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

这意味着找不到类UnhandledException（来自包）（在您的类路径中的任何位置）。org.apache.commons.lang

从Apache Commons下载最新的 Apache Commons 库并将 jar 放入项目WEB-INF/lib目录或在类路径中声明路径。

于 2011-01-12T12:41:44.753 回答