SAP JCo in an Open Source Portal

Hi all together!

I have the following problem: I´m using SAP JCo (2.0.10) with Connection Pooling. The Portlet works with different Users - as long as they don´t send parallel requests.

If everybody waits until process has finished: everything is ok...

In SAP (SM04) I can see, that JCo takes Connections (more than one) for the process.

I don´t know what I could do. Any idea?

Best wishes...

Alex