I'm looking into performance problems for my application and found an oddity that I need help corrected. We have a POJO class that mapped to a database table that, in its basic constructor, does some initialization to the class. This initialization is fairly cheap; however, hibernate is creating thousands of proxy objects that subclass my POJO during operation, and, subsequently, is executing my initialization code too often, making it a performance problem.

So I seek to understand how I can reduce the number of proxy objects being created by hibernate:

I call add to a hibernate managed persistent set once:

org.hibernate.collection.PersistentSet.add(Object)...beneath it initializeEntity() is being called thousands of times (11,807 times)...this leads to the creation of proxy objects to my POJO thousands of times. The constructor for the generated proxy object is called the 11,807 times.
...

org.hibernate.collection.PersistentSet.add(Object) 169,753 ms Called 1 time

leads to

org.hibernate.engine.TwoPhaseLoad.initializeEntity(Object, boolean, SessionImplementor, PreLoadEvent, PostLoadEvent)
93,984ms Called 11,807 times

which leads to

com.gaic.uwd.core.dataaccess.beans.Quote$$EnhancerByCGLIB$$34910fb6.<init>()
76,562ms Called 11,807 times

Thanks,
jsfguy1234

My curiosity is piqued - can you whip up a simple JUnit or main() that demonstrates this? Paste the code & mappings here.

I would assume that this happens because when you call add Hibernate initializes the (lazy) set and loads Quote objects that are in the database that are already part of this set.

[quote="nordborg"]I would assume that this happens because when you call [b]add[/b] Hibernate initializes the (lazy) set and loads Quote objects that are in the database that are already part of this set.[/quote]

There is no set with multiple quote objects - in fact there is only on quote object. Now, the quote objects contains sets of objects that have relationships to that quote object, but there is only one quote object. I definetly am not loading a set of 11,000+ quote objects.

I'm trying to come up with a unit test or main()...

Turns out the profiler YourKit is broken and reporting bad results...I started stepping through code in a debugger and found TwoPhaseLoad.initializeEntity() is only being called once. The high number of calls to the Quote proxy constructor are coming from loading a large set of objects that have a relation to the Quote object...which I suppose is normal...so this is not a hibernate problem at all.