[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2229) Performance issue with fix for HHH-1293, CGLIBLazyInitializer may be slower for certain Java classes

[Scott Marlow (JIRA)]

Performance issue with fix for HHH-1293, CGLIBLazyInitializer may be slower for certain Java classes
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         Key: HHH-2229
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2229
     Project: Hibernate3
        Type: Bug

    Versions: 3.2.0.ga    
    Reporter: Scott Marlow
 Assigned to: Scott Marlow 
     Fix For: 3.2.1


Customer reports:

"we've used the Hibernate for Version 3.2.0 CR 2 with Hibernate Annotations and Proxy interfaces for Lazy initialization. After we changed to Version 3.2.0 GA our Application is 5-7 times slower than before. My Java Profiler says that the Class org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.addCheckingTypes is called over 11 Million times (with recursion). This method was not present in the old release candidate. The problem is that this methods adds recursively all interfaces of a type and its subclasses into a List in our non trivial object hierarchy.
"

And later:

"The CGLIBLazyInitializer.invoke() method was called 64.000 Times. I found out that the Problem were the @Proxy annotations with a specified proxy interface in all of our classes (this was necessary in the old version to prevent ClassCastExceptions). If we specify the proxy interface only on the classes where we need it, the performance is much better.
"

Forum reference: http://forum.hibernate.org/viewtopic.php?t=967060

I'll look into some suggestions that Steve suggested that I try:

1.  use class.isAssignableFrom() .

2.  use class.isInstance().    if ( !method.getDeclaringClass().isInstance( target ) ) {throw new ClassCastException( target.getClass() .getName() );}  

3.  use instanceof test



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