Spring Boot Microservice com.netflix.zuul.exception.ZuulException: Forwarding error

Question

I have created micro service using spring boot and implment zuul proxy so when I call url via zuul proxy and somehow my service is down I get com.netflix.zuul.exception.ZuulException: Forwarding error I have also implement errorFilter and send custom message from errorFilter but it's not working for me. I get below response:

{
"timestamp": 1537261710692,
"status": 500,
"error": "Internal Server Error",
"exception": "com.netflix.zuul.exception.ZuulException",
"message": "GENERAL"}

Answer 1

This problem occurs when your back-end service is not available but your gateway make proxy calls to unavaiable back-end service.

If you read a log file, you can check it.

DynamicServerListLoadBalancer for client BACKEND-YOUR-SERVICE initialized: 
DynamicServerListLoadBalancer:{NFLoadBalancer:name=BACKEND-YOUR-SERVICE,
current list of Servers=[]

It means that there are not available servers of your back-end service.

Please check in the following order.

1. Check whether your back-end service is running
2. (If you use Eureka Server) Check whether your back-end service is registered on Eureka server on Eureka webpage.
3. Check whether your zuul proxy is configured with correct back-end service name.