Spring-Cloud Hystrix (fallback method wasn't found)

Question

I'm trying to use hyst however when calling the save method, which makes a post with resttemplate, gives the following exception:

com.netflix.hystrix.contrib.javanica.exception.FallbackDefinitionException: fallback method wasn't found: breaker([class com.wnb.mastercard.domain.enroll.EnrollCommand])

Can someone help me?

@Component
public class EnrollRepositoryRest {

    @Autowired
    private RestTemplate template;

    @Value("${beblue-card-enroll.url}")
    private String url;

    public Enroll getEnrollByCardId(String cardId) {

        Enroll[] enroll = template.getForObject(url + "cardEnroll/enroll/" + cardId, Enroll[].class);

        return enroll[0];
    }

    @HystrixCommand(fallbackMethod = "breaker")
    public void save(EnrollCommand command) {
        template.postForObject(url + "/cardEnroll/enroll", command, EnrollCommand.class);
    }

    public String breaker() {
        System.out.println("HYSTRIX EXECUTADO");
        return "Hystrix is Ok";
    }
}

Ramon Rius · Accepted Answer · 2017-07-28T23:20:00.963

24

I think the exception is clearly telling you the issue. The method:

public String breaker(EnrollCommand command) {
    System.out.println("HYSTRIX EXECUTADO");
    return "Hystrix is Ok";
}

Does not exist. (Notice the argument in the signature)

When you define a fallback method with that annotation the fallback method must match the same parameters of the method where you define the Hystrix Command.

edited Jul 28 '17 at 23:20

answered Feb 02 '17 at 02:07

Ramon Rius

404
3
7

2

it worked, circuit breaker method and fallback method should have same parameter – Prakash P Mar 29 '17 at 07:37

score 2 · Answer 2 · answered Apr 11 '18 at 12:55

@Ramon Rius

Even the return type has to be same as of the 'save' method, in this case it is void.

Without that am getting this error.

ERROR 10340 --- [nio-8060-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : 
Servlet.service() for servlet [dispatcherServlet] in context with path [] 
threw exception [Request processing failed; nested exception is 
com.netflix.hystrix.contrib.javanica.exception.FallbackDefinitionException: 
Incompatible return types. 
Command method: public long com.brownfield.pss.book.component.BookingComponent.book(com.brownfield.pss.book.entity.BookingRecord,java.lang.String);
Fallback method: public java.lang.String com.brownfield.pss.book.component.BookingComponent.fallByMethod(com.brownfield.pss.book.entity.BookingRecord,java.lang.String);
Hint: Fallback method 'public java.lang.String com.brownfield.pss.book.component.BookingComponent.fallByMethod(com.brownfield.pss.book.entity.BookingRecord,java.lang.String)' must return: long or its subclass] with root cause

Thing is both parameters and return type of the fallbackMethod and the main method should be same. The fallbackMethod may have an extra argument of type Throwable

score 2 · Answer 3 · answered Oct 09 '19 at 07:10

2

Fallback method must have same definition as original method.

private void breaker(EnrollCommand command) {
    System.out.println("HYSTRIX EXECUTADO");
}

answered Oct 09 '19 at 07:10

Amol Damodar

359
2
4

Correct, fallback method must have same parameters and same return type. – alext May 14 '20 at 06:31

Spring-Cloud Hystrix (fallback method wasn't found)

3 Answers3