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Thread: GAE Unmarshalling doesn't work for a Set of domainobjects

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Permlink Replies: 17 - Pages: 2 [ 1 2 | Next ] - Last Post: Dec 3, 2011 4:23 AM Last Post By: woolrich

Posts: 2
Registered: 2/9/10
GAE Unmarshalling doesn't work for a Set of domainobjects
Posted: Feb 9, 2010 2:40 PM
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Hey all,

I'm using compass-2.3.0-beta1.jar with GAE. My domainobject are mapped with JDO, here is an simplified version of it:

@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable = "true")
public class Customer {
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Long id;
    @SearchableProperty(name = "customerName")
    private String name;
    @Element(dependent = "true")
    @SearchableReference(cascade = Cascade.ALL, refAlias = "account")
    private Set<Account> accounts;
    private Set<String> testSet;

@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable = "true")
@Searchable(alias = "account")
public class Account {
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    @SearchableId(converter = "keyConverter")
    private Key key;
    @Extension(vendorName="datanucleus", key="gae.parent-pk", value="true")
    private String customerId;
    @SearchableProperty(name = "accountName")
    private String name;

My PMS (;-)) code looks like this:

static {
    	compass = new CompassConfiguration()
	    	.setSetting(CompassEnvironment.ExecutorManager.EXECUTOR_MANAGER_TYPE, "disabled")
// KeyConverter taken from []
	    	.registerConverter("keyConverter", Key.class, new KeyConverter())
    	compassGps = new SingleCompassGps(compass);
    	compassGps.addGpsDevice(new Jdo2GpsDevice("appengine", pmfInstance));
    	if (compass.getSearchEngineIndexManager().isLocked())

The code to perform the query is very simple and looks like this:

public List<Customer getCustomers(String query) {
    CompassSearchSession ss = PMF.getCompass().openSearchSession();
    CompassHits hits = ss.find(query);
    List<Customer> customers = new ArrayList<Customer>();
    for (int i=0; i<hits.length(); i++)
    return customers;

The result of this method is exactly what I expect it to be, all SearchableProperties of the Customers are filled correctly. Only the accounts (Set<Accout>) property has a null value. I tried some everything: annotating it with SearchableReference, SearchableComponent, making the Account class a non-root Searchable, setting an explicit refAlias but the value is still a null value. The strange thing is that the testSet (Set<String>) works correctly, so it seems to be something in the unmarshalling part of Compass.

Is it a bug in Compass/GAE (it's still a beta) or did I overlook something?

Please help me, thanks in advance!


Edited by: kilic on Feb 9, 2010 2:43 PM (added some codeblocks)

Edited by: kilic on Feb 9, 2010 2:45 PM

Edited by: kilic on Feb 10, 2010 3:20 PM

Posts: 2
Registered: 2/9/10
Re: GAE Unmarshalling doesn't work for a Set of domainobjects
Posted: Feb 10, 2010 4:37 PM   in response to: kilic in response to: kilic
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After testing my code a bit more, I realized that the accounts field also not filled when quering with JDO PersistenceManager.
The following annotation on the accounts field did the trick:

@Persistent(defaultFetchGroup = "true")

WIth this annotation the accounts property is always filled directly.

Anyway thanks for listening :-)

Edited by: kilic on Feb 10, 2010 4:37 PM

Posts: 268
Registered: 11/13/11
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Re: GAE Unmarshalling doesn't work for a Set of domainobjects
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