Ah, so it's the garbage collection that's triggering it. I should have known,
given the looping worked for small values. This is good. I can distill the
failure down to a single pair of EOs using System.gc() now. This should make
it a lot easier to investigate.
public void testNestedECs() {
try {
EOEditingContext ec = ERXEC.newEditingContext();
Company c = (Company) EOUtilities.createAndInsertInstance(ec,
Company.ENTITY_NAME);
c.setName("Name");
ec.saveChanges();
EOEditingContext nested = ERXEC.newEditingContext(ec);
Company nestC = c.localInstanceIn(nested);
Employee e = (Employee)
EOUtilities.createAndInsertInstance(nested, Employee.ENTITY_NAME);
e.setFirstName("First");
e.setLastName("Last");
e.setManager(Boolean.FALSE);
e.addObjectToBothSidesOfRelationshipWithKey(nestC,
Employee.COMPANY_KEY);
nested.saveChanges();
ec.saveChanges();
System.gc();
c.delete();
ec.saveChanges();
} catch (Exception e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
Thanks Alexis,
Ramsey
On Jun 11, 2012, at 8:05 PM, Alexis Tual wrote:
> Hi Ramsey,
>
> this bug sounds very familiar...
> In your code, ec.setRetainsRegisteredObjects(true) should do the job, but
> that eats memory.
>
> For more details, see
> http://lists.apple.com/archives/webobjects-dev/2010/Nov/msg00009.html, Mike
> said :
> I don't have a patch you can easily apply. The workaround on your
> side is to not let the EO in the parent EC garbage collect
> (basically, keep a reference to the parent EO around for any EO
> that you fault into child EC).
>
> Good luck on this,
>
> Alex
>
>
> 2012/6/12 Ramsey Gurley <[email protected]>
> Hi all,
>
> I have a suspicion that something is wrong with the way nested ECs are
> currently working. The errors I see are the result of missing snapshots. The
> errors are very sporadic and hard to reproduce. I've managed to distill this
> down to a simple test case. If I drop this:
>
> public void testNestedECs() {
> try {
> EOEditingContext ec = ERXEC.newEditingContext();
> for(int i = 0; i < 100; i++) {
> Company c = (Company)
> EOUtilities.createAndInsertInstance(ec, Company.ENTITY_NAME);
> c.setName(UUID.randomUUID().toString());
> ec.saveChanges();
> EOEditingContext nested = ERXEC.newEditingContext(ec);
> Company nestC = c.localInstanceIn(nested);
> for(int j = 0; j < 10; j++) {
> Employee e = (Employee)
> EOUtilities.createAndInsertInstance(nested, Employee.ENTITY_NAME);
> e.setFirstName(UUID.randomUUID().toString());
> e.setLastName(UUID.randomUUID().toString());
> e.setManager(Boolean.FALSE);
>
> e.addObjectToBothSidesOfRelationshipWithKey(nestC, Employee.COMPANY_KEY);
> nested.saveChanges();
> ec.saveChanges();
> }
> c.delete();
> ec.saveChanges(); //Line 78
> }
> } catch (Exception e) {
> e.printStackTrace();
> Assert.fail(e.getMessage());
> }
> }
>
> into ERXECTest.java, I get fairly reliable failures due to missing snapshots.
>
> java.lang.IllegalStateException: recordDeleteForObject:
> com.webobjects.eoaccess.EODatabaseContext
> com.webobjects.eoaccess.EODatabaseContext@489bb457 failed to find a snapshot
> for EO with Global ID:_EOIntegralKeyGlobalID[Employee (java.lang.Integer)491]
> that has been deleted from
> er.extensions.eof.ERXECer.extensions.eof.ERXEC@44581ea2. Cannot delete an
> object that has not been fetched from the database
> at
> com.webobjects.eoaccess.EODatabaseContext.recordDeleteForObject(EODatabaseContext.java:4732)
> at
> com.webobjects.eoaccess.EODatabaseContext.recordChangesInEditingContext(EODatabaseContext.java:5890)
> at
> com.webobjects.eocontrol.EOObjectStoreCoordinator.saveChangesInEditingContext(EOObjectStoreCoordinator.java:373)
> at
> com.webobjects.eocontrol.EOEditingContext.saveChanges(EOEditingContext.java:3192)
> at er.extensions.eof.ERXEC._saveChanges(ERXEC.java:1177)
> at er.extensions.eof.ERXEC.saveChanges(ERXEC.java:1100)
> at er.extensions.eof.ERXECTest.testNestedECs(ERXECTest.java:78)
>
> If I drop the number of loops down to 10 instead of 100, I don't see the
> exceptions. Does anyone see an obvious problem with my test case or perhaps
> have ideas about what's going wrong before I begin digging? :-)
>
> Ramsey
>
>
>
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