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I know of at least two byte-code enhancer that modify the "object model" at runtime to allow transaction to be performed transparently. One of them is part of Versant VOD, which I use at work every day, and the other is part of Terracotta. There are probably quite a few others, for example in ORM, but Versant takes care of that at my company. My question is, is there such an open-source API that can be used on it's own, independent of the product that it was designed for? You could say an "hackable" API. It should only track changes , not read access, which would slow down the code significantly. In other words, it should not require explicit read/write locking. This requires either access to all classes that perform changes, not just to the data model, or it requires to keep some form of "previous version" in memory to do a comparison. The problem that I'm trying to solve is that I have "large" (32K to 256K) object graphs that are "serialized" in a (NoSQL) DB. They are long-lived and must be re-serialized regularly to have an "history" of the changes. But they are rather expensive to serialize, and most changes are minor. I could serialize them fully each time and run a binary diff on the stream, but that sounds very CPU intensive. A better solution would be an API that modify write operations on the model to protocol the changes, so that after the initial "image" is stored, only the protocol need to be stored. I've found some questions talking about Apache Commons Beanutils to compare objects, but that is not useful for in-place changes; I would need to make a complete clone of the model between every "business transaction". To reiterate, I'm looking for an "in-memory" API, within the same JVM, which does not involve any external server application. APIs involving native code are OK if they are available on Win, Mac & Linux. The API does not have to be currently packaged independently; it just has to

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