java - Google App Engine Jersey 错误格式 json

Question

我正在使用带有 Jersey 和 JAX-RS 的 Google App Engine JAVA 开发 REST API。我希望能够以 JSON 格式向用户发送自定义错误，因为我使用的是 javax.ws.rs.ext.ExceptionMapper

当我在本地计算机上使用 Jetty 运行应用程序时一切正常，但当我部署到 Google 时，我得到默认的 HTML 404 页面

这是资源代码:

@GET
@Produces(MediaType.APPLICATION_JSON)
@Path("{id}")
public Customer getCustomer(@PathParam("id") String id) {
    Customer customer = getCustomer(id);
    if(customer == null)
        throw new NotFoundException("Customer not found");
    return customer;
}

异常映射器:

@Provider
public class NotFoundExceptionMapper implements ExceptionMapper<NotFoundException> {

@Override
public Response toResponse(NotFoundException e) {
    ErrorMessage errorMessage = new ErrorMessage();
    errorMessage.setErrrorMessage(e.getMessage());
    errorMessage.setResponseCode(404);
    return Response.status(Response.Status.NOT_FOUND).entity(errorMessage).type(MediaType.APPLICATION_JSON_TYPE).build();
}    
}

我希望获得 JSON 格式的 ErrorMessage 对象作为响应，但我得到的只是默认的 HTML 404 页面。

Answer 1

您可以设置 Jersey 属性 ServerProperties.RESPONSE_SET_STATUS_OVER_SEND_ERROR为true。

Whenever response status is 4xx or 5xx it is possible to choose between sendError or setStatus on container specific Response implementation. E.g. on servlet container Jersey can call HttpServletResponse.setStatus(...) or HttpServletResponse.sendError(...).

Calling sendError(...) method usually resets entity, response headers and provide error page for specified status code (e.g. servlet error-page configuration). However if you want to post-process response (e.g. by servlet filter) the only way to do it is calling setStatus(...) on container Response object.

If property value is true the method Response.setStatus(...) is used over default Response.sendError(...).

Type of the property value is boolean. The default value is false.

The name of the configuration property is "jersey.config.server.response.setStatusOverSendError".