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The automatic state-detection provided by saveOrUpdate() becomes even more useful when you not only work with single instances, but also want to reattach or persist a network of connected objects and apply cascading options Also reread the definition of the merge() operation and when to use merging instead of reattachment: Merging the state of a detached object in chapter 9, section 932 So far, you ve solved only one of the conversation implementation problems: little code was required to implement the conversation However, the application user still expects that the unit of work is not only isolated from concurrent modifications, but also atomic You isolate concurrent conversations with optimistic locking As a rule, you shouldn t apply a pessimistic concurrency-control strategy that spans a long-running conversation this implies expensive and nonscalable locking In other words, you don t prevent two operators from seeing the same auction item.

Here you can use the different <ejbdoclet> subtasks, and the different <ejbjar> nested tasks to create the specific EJB JAR files for your target system Server-specific deployment processes The actual deployment mechanism for each platform can vary wildly Ant can address this, and you can always deploy by hand until you are ready to write the Ant support Although this can be labor intensive, it is actually one of the least dangerous differences between servers, and much less worrisome than subtle run-time variations Server-specific management The operational aspects of the server security, performance, load balancing options, and the management interface are usually significantly different There is little Ant can do in this area When the Java Community Process working group on server.

You hope that this happens rarely: You re optimistic But if it happens, you have a conflict resolution strategy in place You need to enable Hibernate s automatic versioning for the Item persistent class, as you did in Enabling versioning in Hibernate in chapter 10, section 1022 Then, every SQL UPDATE or DELETE at any time during the conversation will include a version check against the state present in the database You get a StaleObjectStateException if this check fails and then have to take appropriate action In this case, you present an error message to.

the user ( Sorry, somebody modified the same auction! ) and force a restart of the conversation from step one. How can you make the conversation atomic The conversation spans several persistence contexts and several database transactions. But this isn t the scope of a unit of work from the point of view of the application user; she considers the conversation to be an atomic group of operations that either all fail or all succeed. In the current conversation this isn t a problem, because you modify and persist data only in the last (second) step. Any conversation that only reads data and delays all reattachment of modified objects until the last step is automatically atomic and can be aborted at any time. If a conversation reattaches and commits modifications to the database in an intermediate step, it s no longer atomic. One solution is to not flush the persistence contexts on commit that is, to set a FlushMode.MANUAL on a Session that isn t supposed to persist modifications (of course, not for the last step of the conversation). Another option is to use compensation actions that undo any step that made permanent changes, and to call the appropriate compensation actions when the user aborts the conversation. We won t have much to say about writing compensation actions; they depend on the conversation you re implementing. Next, you implement the same conversation with a different strategy, eliminating the detached object state. You extend the persistence context to span the whole conversation.

management has finished, we may have a standard API for managing and working with application servers. Ant could then add some tasks to issue calls to the servers, calls that work against multiple platforms. Do not hold your breath for these tasks; we will all have to muddle along for some time.