Module java.base
Package java.util.concurrent

# Interface ForkJoinPool.ForkJoinWorkerThreadFactory

Enclosing class:
  `ForkJoinPool`

public static interface ForkJoinPool.ForkJoinWorkerThreadFactory
Factory for creating new `ForkJoinWorkerThread`s. A `ForkJoinWorkerThreadFactory` must be defined and used for `ForkJoinWorkerThread` subclasses that extend base functionality or initialize threads with different contexts.

## Method Summary

Modifier and Type
Method
Description
`ForkJoinWorkerThread`
`newThread(ForkJoinPool pool)`
Returns a new worker thread operating in the given pool.

## Method Details

### newThread

ForkJoinWorkerThread newThread(ForkJoinPool pool)
Returns a new worker thread operating in the given pool. Returning null or throwing an exception may result in tasks never being executed. If this method throws an exception, it is relayed to the caller of the method (for example `execute`) causing attempted thread creation. If this method returns null or throws an exception, it is not retried until the next attempted creation (for example another call to `execute`).

Parameters:
  `pool` - the pool this thread works in
Returns:
  the new worker thread, or `null` if the request to create a thread is rejected
Throws:
  `NullPointerException` - if the pool is null