I am new to Hystrix Dashboard. I have written sample application with Hystrix. I want to see the Hystrix chart (command metric stream). But I am getting the below error:
Circuit: Unable to connect to Command Metric Stream
Thread Pools: Loading...
I am using STS with Maven.
Below is the code used:
Simple server microservice application (Spring boot web running in port 8085)
package hello;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;
@RestController
@SpringBootApplication
public class BookstoreApplication {
@RequestMapping(value = "/recommended")
public String readingList(){
return "Spring in Action (Manning), Cloud Native Java (O'Reilly), Learning Spring Boot (Packt)";
}
public static void main(String[] args) {
SpringApplication.run(BookstoreApplication.class, args);
}
}
Simple client microservice application (Spring boot web running in port 8095) I have included the dependency of Hystrix and Hystrix Dashboard along with Web, so all the Hystrix dependencies are in classpath
package hello;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import java.net.URI;
@Service
public class BookService {
private final RestTemplate restTemplate;
public BookService(RestTemplate rest) {
this.restTemplate = rest;
}
@HystrixCommand(fallbackMethod = "reliable")
public String readingList() {
URI uri = URI.create("http://localhost:8090/recommended");
return this.restTemplate.getForObject(uri, String.class);
}
public String reliable() {
return "Cloud Native Java (O'Reilly)";
}
}
package hello;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.web.client.RestTemplate;
@EnableHystrixDashboard
@EnableHystrix
@EnableCircuitBreaker
@RestController
@SpringBootApplication
public class ReadingApplication {
@Autowired
private BookService bookService;
@Bean
public RestTemplate rest(RestTemplateBuilder builder) {
return builder.build();
}
@RequestMapping("/to-read")
public String toRead() {
return bookService.readingList();
}
public static void main(String[] args) {
SpringApplication.run(ReadingApplication.class, args);
}
}
By running the above code, the hystrix is working fine, when the BooKStoreApplication is down, it is going to fallback method.
Both the urls are working fine. Normal Case:
http://localhost:8085/recommended
Output: Spring in Action (Manning), Cloud Native Java (O'Reilly), Learning Spring Boot (Packt)
http://localhost:8095/to-read
Output: Spring in Action (Manning), Cloud Native Java (O'Reilly), Learning Spring Boot (Packt)
When BookStoreApplication is down (http://localhost:8085/recommended) accessing http://localhost:8095/to-read returns "Cloud Native Java (O'Reilly)" as expected.
But when I tried to invoke this url http://localhost:8095/hystrix, I am getting the Hystrix DashBoard Page and asking for the stream value.
I have tried given http://localhost:8095/ or http://localhost:8095/to-read, and clicked "Monitor Stream" and it is going to next page with error:
Circuit: Unable to connect to Command Metric Stream
Thread Pools: Loading...
