Allow customization of `@RevisionTimestamp` property name

[rpost]

Why did you hardcode "timestamp" as revision property in org.springframework.data.envers.repository.support.EnversRevisionRepositoryImpl#findLastChangeRevision ?

My custom revision entity has different @RevisionTimestamp property than timestamp.

This results in org.hibernate.QueryException: could not resolve property: timestamp of:... when org.springframework.data.repository.history.RevisionRepository#findLastChangeRevision is called.

[mp911de]

This change was introduced in spring-projects/spring-data-envers#195.

I agree that this isn't ideal, it would sense to lookup the @RevisionTimestamp property and use its name.

[gregturn]

I've made a cursory scan of the Spring Data Envers code, and can't seem to locate the class type that actually holds the @ RevisionTimestamp-annotated field.

While Spring has utilities to extract such an annotated field and get its name, I must first have the name of the class where that can be found. And that I can't seem to discover (yet).

[jmax01]

Unfortunately, we implemented our solution against 3.3.4 and 3.3.5, which did not force us to use timestamp as the property name.

I may be mistaken, but minor changes to the ReflectionRevisionEntityInformation to detect the correct property name and then a modification of EnversRevisionRepositoryImpl to use that name, if it exists, is all that is required to resolve this.