Hibernate4 + c3p0 + Derby - Memory Leak on Tomcat stop or web application reload

Question

I have a very simple application template which includes an embedded apache derby database through hibernate.

I have the following configuration:

Answer 1

A more concise version of the accepted answer that did the trick for me

for (Object o : C3P0Registry.getPooledDataSources()) {
  try {
    ((PooledDataSource) o).close();
  } catch (Exception e) {
    // oh well, let tomcat do the complaing for us.
  }
}