A untested JsonService for Andre

JsonServiceImpl.java

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.inject.Inject;

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.json.MappingJacksonHttpMessageConverter;
import org.springframework.stereotype.Service;

@Service
public class JsonServiceImpl {

	@Inject
	private MappingJacksonHttpMessageConverter converter;

	public String toJson(Object o) {

		MediaType contentType = new MediaType("application", "json");
		HttpOutputMessage outputMessage = new HttpOutputMessage() {

			private ByteArrayOutputStream baos = new ByteArrayOutputStream();

			@Override
			public HttpHeaders getHeaders() {
				throw new UnsupportedOperationException("Not implemented");
			}

			@Override
			public OutputStream getBody() throws IOException {
				return baos;
			}

			@Override
			public String toString() {
				return baos.toString();
			}
		};


		try {
			converter.write(o, contentType, outputMessage);
			String val = outputMessage.toString();
			return val;
			// return objectMapper.writeValueAsString(o);
		} catch (IOException e) {
			e.printStackTrace();  
		}
		return "{\"error\":\"object mapping exception\"}";
	}
}