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Hibernate version: 3

I posted problem here http://www.jboss.com/index.html?module=bb&op=viewtopic&t=146049 but no one has replied yet. I thought I might get some help in this forum. I am getting "Cannot open connection" error. Details are inside the above link. I am not able to understand why that should be happening. We are getting these errors a lot now and there are no issues on Oracle side. It works fine under low load but when we apply high load we start to see these errors. I am wondering if there is any problem with Hibernate connection pooling. May be connections are closed but are still on the pool? Could someone try and help.