RESTesy ContainerRequestFilter overwriting the DefaultEncoding

resteasy-fileupload-4.java

@Provider
public class CharsetFilter implements ContainerRequestFilter {
 
    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        String charset = requestContext.getHeaderString("X-Charset");
        if (charset != null) {
             requestContext.setProperty(InputPart.DEFAULT_CHARSET_PROPERTY, charset);
        }
    }
 
}