A message body writer for Java type, class myPackage.B, and MIME media type, application/octet-stream, was not found

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In your client code you are not specifying the content type of the data you are sending – so Jersey is not able to locate the right MessageBodyWritter to serialize the b1 object.

Modify the last line of your main method as follows:

ClientResponse response = resource.type(MediaType.APPLICATION_XML).put(ClientResponse.class, b1);

And add @XmlRootElement annotation to class B on both the server as well as the client sides.

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