Tomcat on a Linux virtual machine

[Darryl Lewis]

I have an application (commercial) running on a virtual instance of Linux 
talking to a Postgres database.
We are continually getting locks on the DB that are crashing the app.
I think it's just bad programming on the suppliers side, but the supplier has 
latched onto the idea that it is because it is running on a virtual machine.
Has any experienced any problems running Tomcat on a virtual machine similar to 
this?