[rules-users] PermGen OOM and shadow proxies

Hello, I've posted before regarding this issue. We currently evaluating drools 4.01 for our project. We've noticed that the perm gen space grows at a rapid rate and that eventually results in a OOM. When shadow facts are disabled, the problem seems to go away (or at least not as noticeable as before). Any ideas? What is the effect of a shadowed object which itself contains complex objects that are also involved in a pattern (through inline eval)?