On Sat, Dec 13, 2014 at 6:09 AM, <[email protected]> wrote:
>
> Thank you for answering. I tried to create another project, and I now
> consider a Dog entity, but the problem is exactly the same as before. My
> goal is still to query my entities filtering the name.
>
> Uncaught exception from servlet
>> java.io.IOException:
>> com.google.appengine.repackaged.org.codehaus.jackson.map.JsonMappingException:
>> Object Manager has been closed (through reference chain:
>> java.util.HashMap["items"])
>>
>>
The issue seems to be that the persistence manager is shut down before the
Dog entities in the List get fully loaded.
I would suggest adding a *for* loop iterating through the *List<Dog>* just
after the *q.execute* line - this forces the loading of each list entry. To
test that the list holds data, also try printing out a property from each
instance of Dog (you can remove the line after verifying the code works).
So for instance, a sample loop could look like:
//this goes right after q.execute
for (int i = 0; i < candidates.size(); i++) {
Dog candidate = candidates.get(i)
System.out.println(candidate.getSomeStringProperty());
}
-----------------
-Vinny P
Technology & Media Consultant
Chicago, IL
App Engine Code Samples: http://www.learntogoogleit.com
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