SimpleJDBCConnection Connections

Hi, i am new to vaadin, and i use the data binding with filemaker jdbc. Great Framework, but i have one problem.

The Connection to my Database keep increasing with every binding.
I tried to close the connections, with SimplJDBCPool. destroy, but filemaker makes an exception that tells me i have no com.filemaker.jdbc connections open.

Can someone tell me, what i can do?

Thx