Hi. I wasn't able to catch the bug in the route case for now. It occurs very indeterministic. Our object structure is quite complicated. Anyway, the problem occurs when hibernate initializes collections from cache, in PersistentBag.initializeFromCache method:
Code:
Serializable[] array = (Serializable[]) disassembled;
int size = array.length;
beforeInitialize( persister, size ); //(1)
for ( int i = 0; i < size; i++ ) {
Object element = persister.getElementType().assemble( array[i], getSession(), owner ); //(2)
if ( element!=null ) {
bag.add( element ); //(3)
}
}
Time to time (that is what I haven't find out yet precisely), some collection is loaded with duplicate entries, and it should not. Like, there should be entries 1,2,3, and there are: 1,2,3,2,3. (2 and 3 with same identity).
After some not very deep debugging, I found out, that in this method, the line with (2), can 'refill' the bag. So, the debug was like (assume collection with 3 elements [1,2,3]):
1. at line with (1) the collection was newly created.
2. at first cycle, 1. element was taken, and put to collection (2) and (3) [1]
3. at second cycle, 2. element was taken (2) and, the bag was filled with 2 . and 3. element [1,2,3]
3. than at step on line (3) the second element was put to the collection again [1,2,3,2]
4. at third cycle, 3. element was taken (2) and put to bag (3), result: [1,2,3,2,3]
Small fix like this, resolved the problem:
Code:
Serializable[] array = (Serializable[]) disassembled;
int size = array.length;
List<Object> elements = new ArrayList<Object>(size);
for ( int i = 0; i < size; i++ ) {
Object element = persister.getElementType().assemble( array[i], getSession(), owner );
if ( element!=null ) {
elements.add( element );
}
}
beforeInitialize( persister, size );
for ( Object element : elements ) {
bag.add( element );
}
Is this enough for entering a bug? I know I could hunt the bug deeper (I probably will), but currently there is no time for this. Maybe, it is already resolved, or you encountered it, or someone will look at it and will know where the problem lies.
Hibernate version:3.3.1 GA + ehcache 1.3.0 Mapping documents: second level cache on Code between sessionFactory.openSession() and session.close(): I was not able to simulate it easilyFull stack trace of any exception that occurs: no exceptionName and version of the database you are using: oracle xeThe generated SQL (show_sql=true): ...Debug level Hibernate log excerpt:I found the Stack, how the problem happens:
Code:
PersistentBag.beforeInitialize(CollectionPersister, int) line: xx //here is the same collection reinitialized again, and loaded again
CollectionLoadContext.getLoadingCollection(CollectionPersister, Serializable) line: 127
EntityLoader(Loader).readCollectionElement(Object, Serializable, CollectionPersister, CollectionAliases, ResultSet, SessionImplementor) line: 1003
EntityLoader(Loader).readCollectionElements(Object[], ResultSet, SessionImplementor) line: 646
EntityLoader(Loader).getRowFromResultSet(ResultSet, SessionImplementor, QueryParameters, LockMode[], EntityKey, List, EntityKey[], boolean) line: 591
EntityLoader(Loader).doQuery(SessionImplementor, QueryParameters, boolean) line: 701
EntityLoader(Loader).doQueryAndInitializeNonLazyCollections(SessionImplementor, QueryParameters, boolean) line: 236
EntityLoader(Loader).loadEntity(SessionImplementor, Object, Type, Object, String, Serializable, EntityPersister) line: 1860
EntityLoader(AbstractEntityLoader).load(SessionImplementor, Object, Object, Serializable) line: 48
EntityLoader(AbstractEntityLoader).load(Serializable, Object, SessionImplementor) line: 42
SingleTableEntityPersister(AbstractEntityPersister).load(Serializable, Object, LockMode, SessionImplementor) line: 3044
DefaultLoadEventListener.loadFromDatasource(LoadEvent, EntityPersister, EntityKey, LoadEventListener$LoadType) line: 395
DefaultLoadEventListener.doLoad(LoadEvent, EntityPersister, EntityKey, LoadEventListener$LoadType) line: 375
DefaultLoadEventListener.load(LoadEvent, EntityPersister, EntityKey, LoadEventListener$LoadType) line: 139
DefaultLoadEventListener.proxyOrLoad(LoadEvent, EntityPersister, EntityKey, LoadEventListener$LoadType) line: 195
DefaultLoadEventListener.onLoad(LoadEvent, LoadEventListener$LoadType) line: 103
SessionImpl.fireLoad(LoadEvent, LoadEventListener$LoadType) line: 878
SessionImpl.internalLoad(String, Serializable, boolean, boolean) line: 846
ManyToOneType(EntityType).resolveIdentifier(Serializable, SessionImplementor) line: 557
ManyToOneType.assemble(Serializable, SessionImplementor, Object) line: 196
TypeFactory.assemble(Serializable[], Type[], SessionImplementor, Object) line: 420
CacheEntry.assemble(Serializable[], Object, Serializable, EntityPersister, Interceptor, EventSource) line: 96
CacheEntry.assemble(Object, Serializable, EntityPersister, Interceptor, EventSource) line: 82
DefaultLoadEventListener.assembleCacheEntry(CacheEntry, Serializable, EntityPersister, LoadEvent) line: 553
DefaultLoadEventListener.loadFromSecondLevelCache(LoadEvent, EntityPersister, LoadEventListener$LoadType) line: 508
DefaultLoadEventListener.doLoad(LoadEvent, EntityPersister, EntityKey, LoadEventListener$LoadType) line: 357
DefaultLoadEventListener.load(LoadEvent, EntityPersister, EntityKey, LoadEventListener$LoadType) line: 139
DefaultLoadEventListener.proxyOrLoad(LoadEvent, EntityPersister, EntityKey, LoadEventListener$LoadType) line: 195
DefaultLoadEventListener.onLoad(LoadEvent, LoadEventListener$LoadType) line: 103
SessionImpl.fireLoad(LoadEvent, LoadEventListener$LoadType) line: 878
SessionImpl.internalLoad(String, Serializable, boolean, boolean) line: 846
ManyToOneType(EntityType).resolveIdentifier(Serializable, SessionImplementor) line: 557
ManyToOneType.assemble(Serializable, SessionImplementor, Object) line: 196
PersistentBag.initializeFromCache(CollectionPersister, Serializable, Object) line: xxx //NOW HERE IS THE Bag initializing from cache, it fails, see top of the stack!!
CollectionCacheEntry.assemble(PersistentCollection, CollectionPersister, Object) line: 35
DefaultInitializeCollectionEventListener.initializeCollectionFromCache(Serializable, CollectionPersister, PersistentCollection, SessionImplementor) line: 130
DefaultInitializeCollectionEventListener.onInitializeCollection(InitializeCollectionEvent) line: 48
SessionImpl.initializeCollection(PersistentCollection, boolean) line: 1716
PersistentBag(AbstractPersistentCollection).forceInitialization() line: 454
StatefulPersistenceContext.initializeNonLazyCollections() line: 794
QueryLoader(Loader).doQueryAndInitializeNonLazyCollections(SessionImplementor, QueryParameters, boolean) line: 241
QueryLoader(Loader).doList(SessionImplementor, QueryParameters) line: 2220
QueryLoader(Loader).listIgnoreQueryCache(SessionImplementor, QueryParameters) line: 2104
QueryLoader(Loader).list(SessionImplementor, QueryParameters, Set, Type[]) line: 2099
QueryLoader.list(SessionImplementor, QueryParameters) line: 378
QueryTranslatorImpl.list(SessionImplementor, QueryParameters) line: 338
HQLQueryPlan.performList(QueryParameters, SessionImplementor) line: 172
SessionImpl.list(String, QueryParameters) line: 1121
QueryImpl.list() line: 79
QueryImpl.getResultList() line: 66
//some stack before, uninportant
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