Failure

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@ConsumerType
@FunctionalInterface
public interface Failure
```
Failure callback for a Promise.
A Failure callback is registered with a Promise using the Promise.then(Success, Failure) method and is called if the Promise is resolved with a failure.
This is a functional interface and can be used as the assignment target for a lambda expression or method reference.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void fail(Promise<?> resolved)
  Failure callback for a Promise.

- Method Detail
  - fail
```
void fail(Promise<?> resolved)
   throws java.lang.Exception
```
    Failure callback for a Promise.
    This method is called if the Promise with which it is registered resolves with a failure.
    In the remainder of this description we will refer to the Promise returned by Promise.then(Success, Failure) when this Failure callback was registered as the chained Promise.
    If this methods completes normally, the chained Promise must be failed with the same exception which failed the resolved Promise. If this method throws an exception, the chained Promise must be failed with the thrown exception.
    
    Parameters:
    
    resolved - The failed resolved Promise.
    
    Throws:
    
    java.lang.Exception - The chained Promise must be failed with the thrown exception.