Question

我在我的一个java文件中使用apache commons UrlValidator。该文件编译正常，但每当我运行它，我得到UrlValidator类的NoClassDefFoundError

我正在使用带有Eclipse Juno for JavaEE的Google App Engine 1.7.5。我已经在构建路径中包含了commons jar文件以及在源代码下我的项目的运行配置，但我仍然得到相同的错误。

以下是我的java文件的代码：

package com.serv.servshare;

import java.io.*;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.servlet.*;
import javax.servlet.http.*;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.PreparedQuery;
import com.google.appengine.api.datastore.Query;
import org.apache.commons.validator.routines.UrlValidator;

public class Share extends HttpServlet implements Servlet{

private static final long serialVersionUID = 1L;

DatastoreService ds;
String link,email,msgBody,title,name;
String[] schemes={"https","http","ftp"};
UrlValidator urlValidator;
boolean valid;
Query q;
PrintWriter out;
PreparedQuery pq;
Properties props;
Session session;
Message msg;

public void service(ServletRequest req, ServletResponse res)throws ServletException,IOException{

    title=req.getParameter("title").toString();
    link=req.getParameter("link").toString();
    //Instantiate UrlValidator
    urlValidator = new UrlValidator(schemes);
    out=res.getWriter();

    //Validate URL
    if (urlValidator.isValid(link)) {
           valid=true;
        } 
    else {
           valid=false;
        }

    if(valid){
        try{

            ds=DatastoreServiceFactory.getDatastoreService();
            q=new Query("email");
            pq=ds.prepare(q);

            //Query database to get all email ids
            for(Entity result : pq.asIterable()){

                email=result.getProperty("email").toString();
                name=result.getProperty("name").toString();

                //Instantiating the email prerequisites
                props=new Properties();
                session=Session.getDefaultInstance(props, null);
                msgBody=link;
                msg = new MimeMessage(session);
                msg.setFrom(new InternetAddress("webmaster@servshare.appspotmail.com", "WebMaster@ServShare"));
                msg.addRecipient(Message.RecipientType.TO,new InternetAddress(email, name));
                msg.setSubject(title);
                msg.setText(msgBody);

                //Sending out the uploaded link to all subscribers
                Transport.send(msg);

                out.println("<html><head><title>ServShare</title><meta http-equiv=\"refresh\" content=\"3; URL=index.jsp\"></head><body>Email sent! You will be redirected to the home page shortly.</body></html>");
            }

        }
        catch(Exception e){
            out.println("<html><body>An error was encountered while processing your request. Please go back and try again");
            e.printStackTrace();
        }
    }

    else{
        out.println("<html><head><title>ServShare</title><meta http-equiv=\"refresh\" content=\"3; URL=index.jsp\"></head><body>The entered URL is not valid. You will be redirected to the home page shortly.</body></html>");
    }
}

public void doGet(HttpServletRequest req, HttpServletResponse res)throws IOException,ServletException{
    service(req,res);
}

public void doPost(HttpServletRequest req, HttpServletResponse res)throws IOException,ServletException{
    service(req,res);
}

}

并且发生了错误：

HTTP ERROR 500

访问/分享问题。原因是：

org/apache/commons/validator/routines/UrlValidator

引起：

java.lang.NoClassDefFoundError：org / apache / commons / validator / routines / UrlValidator 在com.serv.servshare.Share.service（Share.java:41）在org.mortbay.jetty.servlet.ServletHolder.handle（ServletHolder.java:511）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1166）在com.google.appengine.api.socket.dev.DevSocketFilter.doFilter（DevSocketFilter.java:74）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.ResponseRewriterFilter.doFilter（ResponseRewriterFilter.java:123）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.HeaderVerificationFilter.doFilter（HeaderVerificationFilter.java:34）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter（ServeBlobFilter.java:61）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter（TransactionCleanupFilter.java:43）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.StaticFileFilter.doFilter（StaticFileFilter.java:125）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.BackendServersFilter.doFilter（BackendServersFilter.java:97）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在org.mortbay.jetty.servlet.ServletHandler.handle（ServletHandler.java:388）在org.mortbay.jetty.security.SecurityHandler.handle（SecurityHandler.java:216）在org.mortbay.jetty.servlet.SessionHandler.handle（SessionHandler.java:182）在org.mortbay.jetty.handler.ContextHandler.handle（ContextHandler.java:765）在org.mortbay.jetty.webapp.WebAppContext.handle（WebAppContext.java:418）在com.google.appengine.tools.development.DevAppEngineWebAppContext.handle（DevAppEngineWebAppContext.java:94）在org.mortbay.jetty.handler.HandlerWrapper.handle（HandlerWrapper.java:152）在com.google.appengine.tools.development.JettyContainerService $ ApiProxyHandler.handle（JettyContainerService.java:409）在org.mortbay.jetty.handler.HandlerWrapper.handle（HandlerWrapper.java:152）在org.mortbay.jetty.Server.handle（Server.java:326）在org.mortbay.jetty.HttpConnection.handleRequest（HttpConnection.java:542） at org.mortbay.jetty.HttpConnection $ RequestHandler.headerComplete（HttpConnection.java:923）在org.mortbay.jetty.HttpParser.parseNext（HttpParser.java:547）在org.mortbay.jetty.HttpParser.parseAvailable（HttpParser.java:212）在org.mortbay.jetty.HttpConnection.handle（HttpConnection.java:404）在org.mortbay.io.nio.SelectChannelEndPoint.run（SelectChannelEndPoint.java:409）在org.mortbay.thread.QueuedThreadPool $ PoolThread.run（QueuedThreadPool.java:582）引起：java.lang.ClassNotFoundException：org.apache.commons.validator.routines.UrlValidator 在java.net.URLClassLoader $ 1.run（URLClassLoader.java:366）在java.net.URLClassLoader $ 1.run（URLClassLoader.java:355） at java.security.AccessController.doPrivileged（Native Method）在java.net.URLClassLoader.findClass（URLClassLoader.java:354） at java.lang.ClassLoader.loadClass（ClassLoader.java:423）在com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass（IsolatedAppClassLoader.java:213） at java.lang.ClassLoader.loadClass（ClassLoader.java:356） ......还有34个引起：

java.lang.ClassNotFoundException：org.apache.commons.validator.routines.UrlValidator 在java.net.URLClassLoader $ 1.run（URLClassLoader.java:366）在java.net.URLClassLoader $ 1.run（URLClassLoader.java:355） at java.security.AccessController.doPrivileged（Native Method）在java.net.URLClassLoader.findClass（URLClassLoader.java:354） at java.lang.ClassLoader.loadClass（ClassLoader.java:423）在com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass（IsolatedAppClassLoader.java:213） at java.lang.ClassLoader.loadClass（ClassLoader.java:356）在com.serv.servshare.Share.service（Share.java:41）在org.mortbay.jetty.servlet.ServletHolder.handle（ServletHolder.java:511）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1166）在com.google.appengine.api.socket.dev.DevSocketFilter.doFilter（DevSocketFilter.java:74）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.ResponseRewriterFilter.doFilter（ResponseRewriterFilter.java:123）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.HeaderVerificationFilter.doFilter（HeaderVerificationFilter.java:34）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter（ServeBlobFilter.java:61）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter（TransactionCleanupFilter.java:43）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.StaticFileFilter.doFilter（StaticFileFilter.java:125）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.appengine.tools.development.BackendServersFilter.doFilter（BackendServersFilter.java:97）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在org.mortbay.jetty.servlet.ServletHandler.handle（ServletHandler.java:388）在org.mortbay.jetty.security.SecurityHandler.handle（SecurityHandler.java:216）在org.mortbay.jetty.servlet.SessionHandler.handle（SessionHandler.java:182）在org.mortbay.jetty.handler.ContextHandler.handle（ContextHandler.java:765）在org.mortbay.jetty.webapp.WebAppContext.handle（WebAppContext.java:418）在com.google.appengine.tools.development.DevAppEngineWebAppContext.handle（DevAppEngineWebAppContext.java:94）在org.mortbay.jetty.handler.HandlerWrapper.handle（HandlerWrapper.java:152）在com.google.appengine.tools.development.JettyContainerService $ ApiProxyHandler.handle（JettyContainerService.java:409）在org.mortbay.jetty.handler.HandlerWrapper.handle（HandlerWrapper.java:152）在org.mortbay.jetty.Server.handle（Server.java:326）在org.mortbay.jetty.HttpConnection.handleRequest（HttpConnection.java:542） at org.mortbay.jetty.HttpConnection $ RequestHandler.headerComplete（HttpConnection.java:923）在org.mortbay.jetty.HttpParser.parseNext（HttpParser.java:547）在org.mortbay.jetty.HttpParser.parseAvailable（HttpParser.java:212）在org.mortbay.jetty.HttpConnection.handle（HttpConnection.java:404）在org.mortbay.io.nio.SelectChannelEndPoint.run（SelectChannelEndPoint.java:409）在org.mortbay.thread.QueuedThreadPool $ PoolThread.run（QueuedThreadPool.java:582）由Jetty提供：//

我不知道是什么造成这种情况。谢谢你的帮助。

我添加了这三个文件：commons-validator-1.4.0.jar，commons-validator-1.4.0-javadoc.jar和commons-validator-1.4.0-sources.jar。我将它们添加到项目项目属性 - ＆gt; java构建路径 - ＆gt;库 - ＆gt;添加外部罐子。我将它们添加到我的项目下的运行/调试设置：run / debug - ＆gt; - ＆GT;来源 - ＆gt;添加

Answer 1

如果将这些文件添加到war / WEB-INF / lib会发生什么？

NoClassDefFoundError apache在GAE中使用eclipse来传递UrlValidator

1 个答案: