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Exception in NSPersistentStoreCoordinator addPersistentStoreWithType with html string data, sometimes

Subject: Exception in NSPersistentStoreCoordinator addPersistentStoreWithType with html string data, sometimes
From: Paul Collins <email@hidden>
Date: Mon, 22 Oct 2007 17:21:15 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden

My Core Data app is throwing an exception when reading in the XML data store at launch. This exception only happens when a string attribute of one of my Core Data objects contains "<" which is a legal XML entity AFAIK. This entity was created by Core Data when I stored an HTML string. If I edit the XML file and remove the XML entities, no exception.

When I created a test app using an identical model-defined Core Data Entity, the same HTML string containing the <" XML entities loads with no exception. For some reason, the issue is not reproduced.

Any suggestions? I'm considering storing the HTML as NSData as a workaround, but it would be nice to make sense of this instead.

2007-10-22 16:57:52.378 Enclose[14387] NSExceptionHandler has recorded the following exception: NSInvalidArgumentException -- Attempt to mutate immutable object with appendString:

(gdb) bt #0 0x92bfe014 in -[NSException raise] () #1 0x92bfde68 in +[NSException raise:format:] () #2 0x92cc6364 in mutateError () #3 0x92bca20c in -[NSCFString appendString:] () #4 0x92c27c3c in -[NSXMLTreeReader processText:] () #5 0x92c24a04 in -[NSXMLTreeReader parse] () #6 0x92c240b8 in -[NSXMLDocument initWithData:options:error:] () #7 0x92d30858 in -[NSXMLDocument initWithContentsOfURL:options:error:] () #8 0x94181114 in -[NSXMLObjectStore initWithRootStore:configurationName:options:url:] () #9 0x941674d4 in -[NSPersistentStoreCoordinator addPersistentStoreWithType:configuration:URL:options:error:] () #10 0x00008320 in -[GSApp persistentStoreCoordinator] (self=0x16509b0, _cmd=0x90aa651c) at /Users/paul/Gray/Projects/ Enclose/dev/Enclose/GSApp.m:735 #11 0x00008418 in -[GSApp managedObjectContext] (self=0x16509b0, _cmd=0x90aa15d4) at /Users/paul/Gray/Projects/Enclose/dev/Enclose/ GSApp.m:751 #12 0x92c402ac in _NSGetUsingKeyValueGetter () #13 0x92bf2e6c in -[NSObject(NSKeyValueCoding) valueForKeyPath:] () #14 0x939cc0cc in -[NSBinder _valueForKeyPath:ofObject:mode:raisesForNotApplicableKeys:] () #15 0x939cbd68 in -[NSBinder valueForBinding:resolveMarkersToPlaceholders:] () #16 0x93c669a8 in -[NSObjectParameterBinder _updateObject:observedController:observedKeyPath:context:] () #17 0x939c3c44 in -[NSObject(NSKeyValueBindingCreation) bind:toObject:withKeyPath:options:] () #18 0x937bb9e8 in -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] () #19 0x937a7c9c in loadNib () #20 0x937a76f4 in +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] () #21 0x937febc4 in +[NSBundle(NSNibLoading) loadNibFile:externalNameTable:withZone:] () #22 0x9388ea70 in +[NSBundle(NSNibLoading) loadNibNamed:owner:] () #23 0x9388e810 in NSApplicationMain () #24 0x00002b78 in main (argc=1, argv=0xbffff5dc) at /Users/paul/Gray/ Projects/Enclose/dev/Enclose/main.m:13

Here's my customized version of the Core Data (non-document) template method where the exception is thrown (near the end):

- (NSPersistentStoreCoordinator *) persistentStoreCoordinator {
	
    if (persistentStoreCoordinator != nil) {
        return persistentStoreCoordinator;
    }
	
    NSFileManager *fileManager;
    NSString *applicationSupportFolder = nil;
    NSURL *url;
    NSError *error;

fileManager = [NSFileManager defaultManager]; applicationSupportFolder = [self applicationSupportFolder]; if ( ![fileManager fileExistsAtPath:applicationSupportFolder isDirectory:NULL] ) { [fileManager createDirectoryAtPath:applicationSupportFolder attributes:nil]; }

url = [NSURL fileURLWithPath: [applicationSupportFolder stringByAppendingPathComponent: GSCoreDataStoreFilename]]; // My custom first-run check if ([fileManager fileExistsAtPath:[url path]]) { NSDictionary *dict = [fileManager fileAttributesAtPath:[url path] traverseLink:YES]; if ([dict fileSize] > 0) { iLaunchedWithDatafile = YES; } else { // file created but never saved. This should only happen in testing. [fileManager removeFileAtPath:[url path] handler:nil]; iLaunchedWithDatafile = NO; } } else { iLaunchedWithDatafile = NO; } persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]]; // **** Exception thrown on next line **** if (![persistentStoreCoordinator addPersistentStoreWithType:NSXMLStoreType configuration:@"Main" URL:url options:nil error:&error]){ [[NSApplication sharedApplication] presentError:error]; } return persistentStoreCoordinator; }

Best regards,

Paul Collins
Gracion Software
http://www.gracion.com/

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