Module java.base
Package java.util.concurrent

# Class CompletionException

java.lang.Object
java.lang.Throwable
java.lang.Exception
java.lang.RuntimeException
java.util.concurrent.CompletionException

All Implemented Interfaces:
  `Serializable`

public class CompletionException extends RuntimeException
Exception thrown when an error or other exception is encountered in the course of completing a result or task.

Since:
  1.8
See Also:
  - Serialized Form

## Constructor Summary

Constructors
Modifier
Constructor
Description
`protected`
`CompletionException()`
Constructs a `CompletionException` with no detail message.
`protected`
`CompletionException(String message)`
Constructs a `CompletionException` with the specified detail message.
``
`CompletionException(String message, Throwable cause)`
Constructs a `CompletionException` with the specified detail message and cause.
``
`CompletionException(Throwable cause)`
Constructs a `CompletionException` with the specified cause.

## Method Summary

### Methods declared in class java.lang.Throwable

`addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

### Methods declared in class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

## Constructor Details

### CompletionException

protected CompletionException()
Constructs a `CompletionException` with no detail message. The cause is not initialized, and may subsequently be initialized by a call to `initCause`.

### CompletionException

protected CompletionException(String message)
Constructs a `CompletionException` with the specified detail message. The cause is not initialized, and may subsequently be initialized by a call to `initCause`.

Parameters:
  `message` - the detail message

### CompletionException

public CompletionException(String message, Throwable cause)
Constructs a `CompletionException` with the specified detail message and cause.

Parameters:
  `message` - the detail message
  `cause` - the cause (which is saved for later retrieval by the `Throwable.getCause()` method)

### CompletionException

public CompletionException(Throwable cause)
Constructs a `CompletionException` with the specified cause. The detail message is set to `(cause == null ? null : cause.toString())` (which typically contains the class and detail message of `cause`).

Parameters:
  `cause` - the cause (which is saved for later retrieval by the `Throwable.getCause()` method)