Now I am using GDataI for Java and I tried following code to get Google
document list




DocumentListFeed tempFeed;

tempFeed = myService.getFeed(feedUrl, DocumentListFeed.class);



After I confirmed this code work without problem, I change code as
following to be able to feed more than one page entry, but this code
create Null pointer Exception.



DocumentListFeed tempFeed;

tempFeed = myService.getFeed(feedUrl, DocumentListFeed.class);

resultFeed.getEntries().addAll(tempFeed.getEntries());




while((tempFeed.getNextLink() != null) &&
(tempFeed.getEntries().size()>0));

{

tempFeed = myService.getFeed(new
URL(tempFeed.getNextLink().getHref()),DocumentListFeed.class);

resultFeed.getEntries().addAll(tempFeed.getEntries());

}



I confirmed that “tempFeed.getNextLink()” is null. But this is a
condition to repeat while. I could not understand why this code fail
and I found suspicious info which related to Java while statement bug
in a following URL. Is this real bug?


http://java.decompiler.free.fr/?q=node/263 after I get info, I changed
my code as following and confirmed this code works without error.



DocumentListFeed tempFeed = this.resultDocListFeed;

DocumentListFeed resultFeed = new DocumentListFeed();

boolean okToFeed = true;



do

{

if(tempFeed != null && tempFeed.getEntries() != null)

{

if(tempFeed.getNextLink() != null && tempFeed.getEntries().size()>0)

{

tempFeed = this.docServiceClient.getFeed(new
URL(tempFeed.getNextLink().getHref()),DocumentListFeed.class);

resultFeed.getEntries().addAll(tempFeed.getEntries());

}

else

{

okToFeed = false;

}

}

else

{

okToFeed = false;

}

}while(okToFeed == true);

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