Re: Cannot get QueryTimeout to work

[Lance J. Andersen]

Not sure if you use Statement.cancel() at all but this is an optional 
method  for JDBC and requires a SQLFeatureNotSupportedException to be 
thrown if it is not supported (JDBC 4)

Patrick Linskey wrote:
Also, you may be interested in the OpenJPAEntityManager.cancelAll()
method call, which uses different JDBC pathways to kill running queries.
-Patrick