Runtime Exception while executing Contacts Demo in GD-API

Question

I have downloaded the google data API plugin for eclipse. While dealing with the Contacts template (Demo.java),

/* INSTRUCTION: This is a command line application. So please execute this template with the following arguments:

     arg[0] = username
     arg[1] = password
*/

/**
 * @author (Your Name Here)
 *
 */

import com.google.gdata.client.contacts.ContactsService;
import com.google.gdata.data.contacts.ContactEntry;
import com.google.gdata.data.contacts.ContactFeed;
import com.google.gdata.util.AuthenticationException;
import com.google.gdata.util.ServiceException;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

/**
 * This is a test template
 */

  public class Contacts {

    public static void main(String[] args) {

      try {

        // Create a new Contacts service
        ContactsService myService = new ContactsService("My Application");
        myService.setUserCredentials(args[0],args[1]);

        // Get a list of all entries
        URL metafeedUrl = new URL("http://www.google.com/m8/feeds/contacts/"+args[0]+"@gmail.com/base");
        System.out.println("Getting Contacts entries...\n");
        ContactFeed resultFeed = myService.getFeed(metafeedUrl, ContactFeed.class);
        List<ContactEntry> entries = resultFeed.getEntries();
        for(int i=0; i<entries.size(); i++) {
          ContactEntry entry = entries.get(i);
          System.out.println("\t" + entry.getTitle().getPlainText());
        }
        System.out.println("\nTotal Entries: "+entries.size());
      }
      catch(AuthenticationException e) {
        e.printStackTrace();
      }
      catch(MalformedURLException e) {
        e.printStackTrace();
      }
      catch(ServiceException e) {
        e.printStackTrace();
      }
      catch(IOException e) {
        e.printStackTrace();
      }
    }
  }

it is getting compiled successfully, but throwing this runtime exception (i am providing correct required credentials as arguments).

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/collect/Maps at com.google.gdata.wireformats.AltRegistry.(AltRegistry.java:118) at com.google.gdata.wireformats.AltRegistry.(AltRegistry.java:100) at com.google.gdata.client.Service.(Service.java:532) at Contacts.main(Contacts.java:36) Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Maps at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) ... 4 more

I am sure, i am missing something, but enable to resolve it.

Answer 1

You seem to be missing a dependcy. Download this google-collections and add the jar to your build-path.