NoMessageBodyWriterFoundFailure at sending ByteArrayOutputStream through REST service

I have to send a ByteArrayOutputStream through a rest service, and I got this exception:

org.jboss.resteasy.client.ClientResponseFailure: Unable to find a MessageBodyReader of content-type text/html;charset="iso-8859-1" and type class java.io.ByteArrayOutputStream

I don't understand why and I have to make it work.

Here is my rest service:

@POST
@Path("/exported")
@Consumes(MediaType.APPLICATION_XML)
public ByteArray开发者_如何学运维OutputStream getExported(Wrapper wrapper) {

    ByteArrayOutputStream os = null;

    os = new ByteArrayOutputStream();
    try {
        os.write("TTT".getBytes());
    } catch (IOException e) {
        e.printStackTrace();
    }

    return os;

}

Here is my client:

    ClientRequest request = new ClientRequest("http://localhost:8081/restws/rest/rrr/exported");
    request.accept(MediaType.APPLICATION_XML);

    request.body(MediaType.APPLICATION_XML, new Wrapper(
            listOf Objects));

    ClientResponse<ByteArrayOutputStream> response = request
            .post(ByteArrayOutputStream.class);

    ByteArrayOutputStream os = response.getEntity();

    return "success";

Everything in the class containing this method works, except this method.

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RestEasy doesn't know who to convert your ByteArrayOutputStream into something that can be sent over HTTP. Read up on RESTEasy Content Marshalling and then either use a different content type and/or use a different data type that is automatically handled and/or write a content marshalling provider to handle your ByteArrayOutStream.