jackson-jaxrs-providers

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Once databind adds support for reading a sub-tree:

https://github.com/FasterXML/jackson-databind/issues/820

it would make sense to expose this from JAX-RS endpoint as well. A new annotation, something like:

@Path("/api")
public int submitAccount(@JsonAt("/request/payload/accounts/0") Account account) {
    ...
}

might make sense. It would basically allow binding only a subset of incoming document into parameter, skipping other payload efficiently (although caller will still send it).