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PONoClassDefFoundError apache commons UrlValidator in GAE with eclipse
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  1. PONoClassDefFoundError apache commons UrlValidator in GAE with eclipse
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    copied!<p>i am using the apache commons UrlValidator in one of my java files. the file compiles fine but whenever i run it, i get a NoClassDefFoundError for the UrlValidator class</p> <p>i am using Google App Engine 1.7.5 with Eclipse Juno for JavaEE. i have included the the commons jar file in the build path as well as in the run config of my project under source but i still get the same error.</p> <p>heres the code of my java file:</p> <pre><code>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("&lt;html&gt;&lt;head&gt;&lt;title&gt;ServShare&lt;/title&gt;&lt;meta http-equiv=\"refresh\" content=\"3; URL=index.jsp\"&gt;&lt;/head&gt;&lt;body&gt;Email sent! You will be redirected to the home page shortly.&lt;/body&gt;&lt;/html&gt;"); } } catch(Exception e){ out.println("&lt;html&gt;&lt;body&gt;An error was encountered while processing your request. Please go back and try again"); e.printStackTrace(); } } else{ out.println("&lt;html&gt;&lt;head&gt;&lt;title&gt;ServShare&lt;/title&gt;&lt;meta http-equiv=\"refresh\" content=\"3; URL=index.jsp\"&gt;&lt;/head&gt;&lt;body&gt;The entered URL is not valid. You will be redirected to the home page shortly.&lt;/body&gt;&lt;/html&gt;"); } } 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); } } </code></pre> <p>and heres the error:</p> <p>HTTP ERROR 500</p> <p>Problem accessing /Share. Reason:</p> <pre><code>org/apache/commons/validator/routines/UrlValidator </code></pre> <p>Caused by:</p> <p>java.lang.NoClassDefFoundError: org/apache/commons/validator/routines/UrlValidator at com.serv.servshare.Share.service(Share.java:41) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:123) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:61) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:409) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) Caused by: java.lang.ClassNotFoundException: org.apache.commons.validator.routines.UrlValidator at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:423) at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:213) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ... 34 more Caused by:</p> <p>java.lang.ClassNotFoundException: org.apache.commons.validator.routines.UrlValidator at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:423) at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:213) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) at com.serv.servshare.Share.service(Share.java:41) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:123) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:61) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:409) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) Powered by Jetty://</p> <p>i have no idea as to whats causing this. Thanks for any help.</p> <p>i added these three files: commons-validator-1.4.0.jar, commons-validator-1.4.0-javadoc.jar, and commons-validator-1.4.0-sources.jar. i added them to the project thorugh project properties -> java build path -> libraries -> add external jars. i added them to the run/debug settings under my project: run/debug -> -> source -> add</p>
 

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