I'm getting a strange NPE from deep down in EOF that I can't figure out.
I think it might be related to some slightly funky modeling I'm doing,
but my EOs work fine in other places so I'm not sure why they're broken
here.
Here's the funkiness: I have two models -- NameStore and MyApp.
NameStore contains a single EO, StoredName. MyApp has an EO MyAppPerson
that extends StoredName, but the restricting qualifier is just "id > 0",
that is, all StoredName EOs are MyAppPerson EOs. Basically, we have lots
of (non-WO) apps that use the StoredName table and have their own tables
joined to it. I modeled it in WO this way to keep the NameStore EO
pristine -- all it does is hand out names -- while allowing other apps
to tack things onto a local EO that extends StoredName.
What I want to do is retrieve a StoredName and then bless it into
existence by re-fetching it as a MyAppPerson so I can access all its
related objects. Because the StoredName and the MyAppPerson share the
same primary key value, I'm just passing storedName.id() to a
MyAppPerson method that retrieves items by their PKs.
try {
return (MyAppPerson) EOUtilities.objectMatchingKeyAndValue(ec,
MyAppPerson.ENTITY_NAME, MyAppPerson.ID_KEY, id);
} catch (EOObjectNotAvailableException e) {
throw new RuntimeException("An MyAppPerson identified by " + id + "
could not be found.");
} catch (EOUtilities.MoreThanOneException e) {
throw new RuntimeException("More than one MyAppPerson identified by " +
id + " was found.");
}
The fetch works fine; I get an object back. But EOF explodes when I true
access it, even just item.toString() to print it to a log (stacktrace
below). It appears to be exploding after traversing an optional to-many
join. I can use MyAppPerson items elsewhere so I don't think I have
modeling errors, but, well, I'm totally stumped. Any ideas?
TIA,
zak.
[2007-11-04 10:18:08 EST] <WorkerThread0> java.lang.NullPointerException
at
com.webobjects.eoaccess.EODatabaseContext.arrayFaultWithSourceGlobalID(EODatabaseContext.java:3664)
at
com.webobjects.eoaccess.EODatabaseContext._fireDeferredFaultWithSourceObject(EODatabaseContext.java:2551)
at
com.webobjects.eoaccess.EOAccessDeferredFaultHandler.createFaultForDeferredFault(EOAccessDeferredFaultHandler.java:45)
at
com.webobjects.eocontrol.EOCustomObject.willReadRelationship(EOCustomObject.java:1302)
at
com.webobjects.eocontrol._EOMutableKnownKeyDictionary$Initializer$_LazyGenericRecordBinding.valueInObject(_EOMutableKnownKeyDictionary.java:560)
at
com.webobjects.eocontrol.EOCustomObject.storedValueForKey(EOCustomObject.java:1736)
at
edu.dartmouth.dltg.authorization.eos._AuthzPerson.roles(_AuthzPerson.java:138)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
com.webobjects.foundation.NSKeyValueCoding$ValueAccessor$1.methodValue(NSKeyValueCoding.java:684)
at
com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1160)
at
com.webobjects.eocontrol.EOCustomObject.valueForKey(EOCustomObject.java:1559)
at
com.webobjects.eocontrol.EOCustomObject.eoDescription(EOCustomObject.java:793)
at
com.webobjects.eocontrol.EOCustomObject.toString(EOCustomObject.java:239)
at java.lang.String.valueOf(String.java:2615)
at java.lang.StringBuffer.append(StringBuffer.java:220)
at
edu.dartmouth.dltg.authorization.pages.RoleEditPeople.doSaveDnd(RoleEditPeople.java:138)
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