A simple test (Books/Users) to reproduce the problem.

beantestclient - a simple test client application (runnable: com.newitech.beantest.ejb.Client)
beantest - simple EJB 3 beans.

==========================================================
ANOTHER EXAMPLE AND IDEA OF BUG

PermGen in EJB3 client aplication by remote interface.
The application is as sample as it can be:
-get remote interface of stateless EJB3 (by JNDI)

• ask 1000 times to get a Collection (List) of 10 EntityBeans.

After 255 there is OutOfMemory: PermGen.
JVM options changes nothing (eventualy more PermSpace => longer run).

The reason looks like the Javassist create lazyinitializer classes for every EntityBean retrived from the server.

So: When I debug on server-side, I got before sending Entity to client:
I got:
myEntity[0].id=143534
myEntity[0].flow=<FlowEntity_$$_javassist_7> 13434
...
myEntity[0].user=<UserEntity_$$_javassist_15>...
myEntity[0].stage=<StageEntity_$$_javassist_17>...

And every remote call the class names (name)$..._javassist(index) got the same
indexes (7,15,17) on server side (end every entity in returned collections of entities)

But when I debug on client site - after return from remote call - the indexes of
all returned entities are different (Each next increments index).

So after first call I got:

myEntity[0].id=143534
myEntity[0].flow=<FlowEntity_$$_javassist_0>...
...
myEntity[0].user=<UserEntity_$$_javassist_1>...
myEntity[0].stage=<StageEntity_$$_javassist_2>...
...
myEntity[1].id=143534
myEntity[1].flow=<FlowEntity_$$_javassist_3>
...
myEntity[1].user=<UserEntity_$$_javassist_4>...
myEntity[1].stage=<StageEntity_$$_javassist_5>...
...

After secund call:

myEntity[0].id=143534
myEntity[0].flow=<FlowEntity_$$_javassist_6>...
...
myEntity[0].user=<UserEntity_$$_javassist_7>...
myEntity[0].stage=<StageEntity_$$_javassist_8>...
...
myEntity[1].id=143534
myEntity[1].flow=<FlowEntity_$$_javassist_9>
...
myEntity[1].user=<UserEntity_$$_javassist_10>...
myEntity[1].stage=<StageEntity_$$_javassist_11>...
...

And so on... ... and permGen after 260 iterations...