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I haven't used iBatis myself, but being familiar with JPA, JDO and Neo4J Vaadin applications, I'd say that the same things apply here:
- make sure you detach all objects after you fetch them (this is a problem in e.g. JPA) - use optimistic locking and handle concurrency exceptions properly - for most cases, a session-per-request pattern is preferable - If detached, it is completely safe to use your POJOs in Vaadin code, e.g. in BeanItemContainers
Please report back how you did, It would be nice to hear something about how the integration went :)