public <T> byte[] toBytes(MediaType mediaType, T o) throws IOException {
if (o == null) {
return null;
}
Class<T> clazz = (Class<T>) o.getClass();
MessageBodyWriter<T> writer = findWriter(clazz, null, EMPTY_ANNOTATIONS, mediaType);
if (writer == null) {
throw new IllegalArgumentException(
"cannot convert " + clazz.getName() + " into byte[] (" + mediaType + ")");
}
ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
writer.writeTo(o, clazz, clazz, EMPTY_ANNOTATIONS, mediaType, EMPTY_OBJECT_HEADERS, baos);
return baos.toByteArray();
}
