Nuxeo Java Client must not managed to alter a document under retention / legal hold

What : A sample Java client can invoke an automation operation and alter the main blob of a document under legal hold.
This is a follow-up of NXP-29791 ,fixed for the REST API

How to reproduce:

1. install Nuxeo 10.10 and HF35 (including NXP-29791) and nuxeo-retention and nuxeo-web-ui and boot
2. In WebUI, create a File document and put it in LEGAL HOLD and take its ecm:uuid
3. invoke the sample Nuxeo Java Client: java -cp ... App <ecm:uuid>
4. watch the result in WebUI: the name of the main blob change to something looking like pref12341899768310991495suff

Expected Result:
The main blob should be unchanged and the Java Client should receive an exception