I created an ExeptionMapper :
@Provider
public class NotFoundExceptionMapper implements ExceptionMapper<NotFoundException> {

private static final Logger LOG = Logger.getLogger(NotFoundExceptionMapper.class);
@Context
HttpHeaders httpHeaders;

/*

• (non-Javadoc)
• @see javax.ws.rs.ext.ExceptionMapper#toResponse(java.lang.Throwable)
  */
  @Override
  public Response toResponse(final NotFoundException exception) { // TODO add to docs: INTERNAL_SERVER_ERROR LOG.error("Exception is being handled by NotFoundExceptionMapper"); LOG.error(exception.getMessage()); return Response.status(HttpStatus.SC_INTERNAL_SERVER_ERROR).type(httpHeaders.getMediaType().toString()).build(); }

  }

When I try to access non-existant url I got the following stacktrace :
SEVERE: Servlet.service() for servlet Resteasy threw exception
org.jboss.resteasy.spi.LoggableFailure: Unable to inject contextual data of type: javax.ws.rs.core.HttpHeaders
at org.jboss.resteasy.core.ContextParameterInjector$GenericDelegatingProxy.invoke(ContextParameterInjector.java:53)
at $Proxy16.getRequestHeader(Unknown Source)