setUserCredentials makes a POST over SSL:
https://www.google.com/accounts/ClientLogin...

see 
http://code.google.com/p/gdata-java-client/source/browse/trunk/java/src/com/google/gdata/client/GoogleAuthTokenFactory.java#417

Can you step through in a debugger and see where the code
is getting stuck.  It's possible the HttpURLConnection is causing
this.

Eric

On Dec 12, 2:04 am, vipzhanghl <[email protected]> wrote:
> Here are my code:
>
> package sample;
>
> import java.net.URL;
> import com.google.gdata.client.docs.DocsService;
> import com.google.gdata.data.docs.DocumentListEntry;
> import com.google.gdata.data.docs.DocumentListFeed;
>
> public class GoogleDocsTest {
>         /**
>          * @param args
>          */
>         public static void main(String[] args) {
>                 try {
>                         DocsService service = new DocsService("Document list 
> test");
>
>                         System.out.println("1");
>                         service.setUserCredentials("[email protected]", 
> "passwordnew");
>                         System.out.println("2");
>
>                         URL documentListFeedUrl = new 
> URL("http://docs.google.com/feeds/
> documents/private/full");
>
>                         DocumentListFeed feed = 
> service.getFeed(documentListFeedUrl,
> DocumentListFeed.class);
>
>                         for(DocumentListEntry entry : feed.getEntries()) {
>                                 System.out.println("Entry's content = " + 
> entry.getTitle
> ().getPlainText());
>                         }
>                 }
>                 catch (Exception ex) {
>                         ex.printStackTrace();
>                 }
>         }
>
> }
>
> The program never print "2" shows that the setUserCredentials() method
> not finished.  At the same time, 100% CPU usage happened.
>
> could anyone know this? I run this program from Eclipse IDE with Docs
> plug-in.
>
> Thanks a lot!
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