netbeans 7.2.1与mysql连接java.lang.ClassNotFoundException

时间：2013-04-07 06:29:40

标签： java mysql servlets netbeans java.lang.class

我正在研究servlet，当我运行servlet时，我在资源管理器中遇到了错误

type Exception report

message
descriptionThe server encountered an internal error () that prevented it from fulfilling this request.

exception
javax.servlet.ServletException: PWC1397: Wrapper cannot find servlet class com.jp.NewServlet or a class it depends on
root cause
java.lang.ClassNotFoundException: com.jp.NewServlet

以下是程序的代码，它本身是在netbeans下构建的

package com.jp;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class NewServlet extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    try {

        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet NewServlet</title>");            
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Servlet NewServlet at " + request.getContextPath() + "</h1>");
        out.println("</body>");
        out.println("</html>");
    } finally {            
        out.close();
    }
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

@Override
public String getServletInfo() {
    return "Short description";
}
}

在glassfish服务器消息

下的netbeans上显示以下错误 
SEVERE: WebModule[/JP first-war]Error loading WebappClassLoader (delegate=true; repositories=WEB-INF/classes/) com.jp.loginservlet
java.lang.ClassNotFoundException: com.jp.NewServlet
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1509)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1359)
at org.apache.catalina.core.StandardWrapper.loadServletClass(StandardWrapper.java:1403)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1267)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1079)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:189)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:619)

我认为以下也是错误

WARNING: StandardWrapperValve[loginservlet]: PWC1382: Allocate exception for servlet NewServlet
java.lang.ClassNotFoundException: com.jp.NewServlet
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1509)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1359)
at org.apache.catalina.core.StandardWrapper.loadServletClass(StandardWrapper.java:1403)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1267)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1079)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:189)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:619)

我已正确设置web.xml文件以进行servet映射和所有.. 问题是，当我输入包时，当提示显示它时，我找不到我的包路径com.jp

你可以引导我走出这个......？ 紧急

提前感谢你

1 个答案:

答案 0 :(得分：0)

NewServlet类的全名是com.jp.NewServlet。然而，服务器正在搜索名为com.jp.loginservlet的类。

在你的web.xml中，是否有Tag：

<servlet>
    <servlet-name>NewServlet</servlet-name>
    <servlet-class>com.jp.loginservlet</servlet-class>
</servlet>

应该是

<servlet>
    <servlet-name>NewServlet</servlet-name>
    <servlet-class>com.jp.NewServlet</servlet-class>
</servlet>

编辑： 以防万一：你是否尝试过“清洁和建造”？在大多数情况下，解决了这个问题。

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