Hibernate version: 3.2.6.ga

Hello, I'm trying to use an Interceptor, and I haven't been able to find the answers to a couple of (seemingly) basic questions. I've got things configured OK, my Interceptor is being called when I expect.

1) In the documentation for Interceptor.findDirty(), the return value is described as:
The return value determines whether the entity is updated

* an array of property indices - the entity is dirty
* an empty array - the entity is not dirty
* null - use Hibernate's default dirty-checking algorithm

The last two are clear. But what about the first case? How long should the array be? What should be in each element? Or is it OK to always return a single-element array containing a 0?

2) For the methods Interceptor.onSave() and onFlushDirty(), is it OK to call methods on the first parameter (entity) that might change the value of fields that will be persisted? Or is it only legal to change the values of the state or currentState parameters?

I'd appreciate any help -- my experiments haven't answered these questions yet, although I'm still working on it....

The length of the array is determined by the number of properties that are dirty. Each element is an index to the Object[] that was passed to the findDirty() method.



INot always I think. If you have mapped your class with dynamic-update="true" I think Hibernate needs the indexes to be able to generate the proper SQL statement. There may be other reasons as well, so it is probably safer to try to return the correct index values.



I really don't know, but my feeling is that as long the method call doesn't cause lazy initialization of proxies or collections it may not do any harm, but I wouldn't expect the changed properties to get persisted to the database.