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How to perform dirty object tracking

This is generally done automatically.

The DomainObjectContainer provides the objectChanged() method in order to mark an object's state as having changed, and therefore requiring an update to the persistent object store.

In earlier versions of the framework it was necessary to call this method after mutating any the property or collection. This is no longer required because Apache Isis uses bytecode enhancement to automatically call this method. This is done either by Isis itself, or (in the case of the JDO ObjectStore), done by the objectstore enhancement process.

It is not possible to disabled bytecode enhancement if using the JDO Objectstore. While it is possible to disable Isis' bytecode enhancement using file, this is not generally recommended. Only if Isis' bytecode enhancement has been disabled and the JDO ObjectStore is not being used would there be a requirement to call the objectChanged() method manually.