SpringSource/spring-integration — pull request #631 by olegz (2012-09-20 12:28:18+00:00)
Title: INT-2757 JdbcMessageStore fix removeMessageGroup

Fixed removeMessageGroup logic to ensure it also executes delete on the join table so there are no dangling
join rows.
Added defencive logic to the getMessageGroup method to ensure it no longer throws an exception IF the scenario
fixed with the previous comment still re-appears (and it can if MGS is not executed under TX as in most cases)