I have found that when using connections in Jonas without a transaction
context, Jonas will not make sure that the connection passed back from
the pool belongs to the user requested from the application code. For
example, if somewhere in your bean you do:
Connection conn = dataSource.getConnection(dbUser, dbPassword);
you might get a connection which belongs to a different user if another
session has already created and closed a connection. This is because
Pool.openConnection(String user, Transaction tx) ignores the user
parameter! If the transaction is not null, it uses a hash lookup to grab
the coressponding connection. However, if the tx is null, it just grabs
the last free connection off a ll. Seems to me that a hash lookup by
user should be done here as well.
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