Lock Commit and Roll Back through java app.

Hi everybody,
        we r using AS/400 V4R4 model 170 JDK 1.1.7
we want to explicitly manage database Locks from a java Application.
Also we want to explicitly Commit and Rollback from the application.
i.e we want to manage transactions explicitly from application.

Can anybody tell me what different approaches can be taken
to do this???????

Thanxx a lot
Trivedi and friends.

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