This commit uses a local variable for the creation of a new JMS
Connection so that a rare failure in prepareConnection(...) does not
leave the connection field in a partially initialized state.
If such a JMSException occurs, the intermediary connection is closed.
This commit further defends against close() failures at that point,
by logging the close exception at DEBUG level. As a result, the original
JMSException is always re-thrown.
See gh-29116
Closes gh-30051
8a879c6fed