JdbcOperationsSessionRepository recently introduced validation when inserting new session attributes in order to prevent data integrity violations in highly concurrent environments. This is done by using INSERT INTO ... SELECT statement to verify existence of session record in parent table. Such arrangement causes problems with Oracle if inserted attribute is of size 4 kb or more.
This commit enhances JdbcHttpSessionConfiguration to detect Oracle database is used, and set createTemporaryLob option on default LobHandler to true.
Resolves: #1208
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