Get failure exception in @HystrixCommand fallback method

Question

Is there a way to get the reason a HystrixCommand failed when using the @HystrixCommand annotation within a Spring Boot application? It looks like if you implement your own HystrixCommand, you have access to the getFailedExecutionException but how can you get access to this when using the annotation? I would like to be able to do different things in the fallback method based on the type of exception that occurred. Is this possible?

I saw a note about HystrixRequestContext.initializeContext() but the HystrixRequestContext doesn't give you access to anything, is there a different way to use that context to get access to the exceptions?

Answer 1

Simply add a Throwable parameter to the fallback method and it will receive the exception which the original command produced.

From https://github.com/Netflix/Hystrix/tree/master/hystrix-contrib/hystrix-javanica

    @HystrixCommand(fallbackMethod = "fallback1")
    User getUserById(String id) {
        throw new RuntimeException("getUserById command failed");
    }

    @HystrixCommand(fallbackMethod = "fallback2")
    User fallback1(String id, Throwable e) {
        assert "getUserById command failed".equals(e.getMessage());
        throw new RuntimeException("fallback1 failed");
    }