How to support previous non-spec behavior compatibility

[Donald Woods]

In looking at adding query timeout support for JPA 2.0, I've discovered 
that the existing lock manager code is using setQueryTimeout() for the 
locks, instead of using the server-side methods (like for DB2 "SET LOCK 
TIMEOUT <secs>".)  What is the suggested way of creating a 
"compatibility" mode, so users can choose the old behavior over the new 
2.0 implementation?

-Donald