android - Jersey / Rest default character encoding

Question

Jersey seems to fail when returning JSON...
This:

@GET
@Produces( MediaType.APPLICATION_JSON + ";charset=UTF-8")
public List<MyObject> getMyObjects() {
    return ....;
}

is needed to return JSON utf-8 encoded. If I use only

@Produces( MediaType.APPLICATION_JSON)

fails and for example German umlaute (ü??), will be returned in a wrong way.

Two questions:
1 - For JSON utf-8 ist standard - why not with Jersey?
2 - Can I set utf-8 for the whole REST-Servlet if a JSON Request comes in?

I am using Jersey 1.5 and CRest 1.0.1 on Android...

Answer 1

SRGs suggestion works like a charm. However, since Jersey 2.0 the interfaces are slightly different, so we had to adapt the filter a little bit:

import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;

import javax.ws.rs.core.MediaType;

public class CharsetResponseFilter implements ContainerResponseFilter {
    @Override
    public void filter(ContainerRequestContext request, ContainerResponseContext response) {
        MediaType type = response.getMediaType();
        if (type != null) {
            String contentType = type.toString();
            if (!contentType.contains("charset")) {
                contentType = contentType + ";charset=utf-8";
                response.getHeaders().putSingle("Content-Type", contentType);
            }
        }
    }
}