HelloWorldCommand.java

public class HelloWorldCommand extends HystrixCommand<String> {

    public HelloWorldCommand() {
        super(HystrixCommandGroupKey.Factory.asKey("HelloWorld"));
    }

    @Override
    protected String getFallback() {
        return "Good Bye";
    }

    @Override
    protected String run() throws Exception {
        return "Hello World";
    }
}