Sent: Tue 14-06-2005 17:00
To: hibernate-devel@lists.sourceforge.net
Subject: [Hibernate] Complex class loaders hierarchy
Hello,
I've trying to use Hibernate in the environment
with complex classloaders hierarchy (Eclipse plugin). During my experiments I've
found the following problem. In order to proxy generation (via cglib) to work it
is required that HibernateProxy is visible from the classloader that loads mine
entities (since CGLib Enhancer by default uses superclass
classloader).
But in mine environment this is not true, since I do not
want to make plugin with entities to depend on the plugin with Hibernate jar (so
hibernate classes are not visible from the classloader that loads
entities).
To make Hibernate see my entities I set my own thread context
classloader that "sees" both Hibernate jars and enities. So what I want is to
make Enhancer use this classloader when generating proxy too.
I propose
the following modification to the CGLIBLazyInitializer:
First, try
generate proxy with default classloaders (superclass classloader). If it fails,
try to generate proxy with Enhancer classloader set to the current thread
context classloader. I think, this will be consistent with current
implementation, since it already uses thread context classloader to load
entities (so why not to use this classloader for proxy generation
too?).
I've attached a simple patch for this issue that shows the
idea.
