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In our more recent web apps, a default flush mode is set in the OpenSessionInView interceptor. The default flush mode setting for the OSIV interceptor is NEVER, although OGS and OREG use a default flush mode setting of AUTO. The recommendation in the OSIV interceptor Javadoc is for all Hibernate operations to take place in transactions, with the transaction manager to handle flushing - in this scheme, OSIV should not need to flush. We need to revisit OGS & OREG on this issue. Update: see the Read-Only / Read-Write Modes section above for a description of how these two flush modes affect transaction behavior.
JPA - currently only has two flush modes; COMMIT (required to flush only before commit - may flush at other times) and AUTO (required to flush before any query and before commit). For this reason, we should possibly not use NEVER or MANUAL, as they are Hibernate-specific and will not translate to JPA.
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