Partial update with PUT

I want to implement a partial update with PUT (don't suggest PATCH to me, not going to happen :P).

When using normal beans you don't differentiate between null and ascent.
Null = update the value to null
Absent = Don't update the field.

Example.
POST { "value1": "a", "value2": "b" }
PUT { "value1": "c" }
GET { "value1": "c", "value2": "b" }

POST { "value1": "a", "value2": "b" }
PUT { "value1": "c", "value2": null }
GET { "value1": "c", "value2": null }

How can I implement this with Jersey?
I would still like to use beans and not a map instead....

No file, test, or entry point is named. Start by reviewing Jersey's PUT request handling and bean deserialization; done means defining and documenting how absent and null bean properties are distinguished during partial updates.

Written by the indexing model from the issue text.