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Task-specific recovery or clean-up actions can be performed by overriding the {{afterExecute()}} hook of the {{java.util.concurrent.ThreadPoolExecutor}} class. This hook is called either when a task concludes successfully by executing all statements in its {{run()}} method or when the task halts because of an exception. Some implementations may fail to catch {{java.lang.Error}}. (See [Bug ID 6450211|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6450211] for more information \[[SDN 2008|AA. Bibliography#SDNReferences#SDN 08]\].)  When using this approach, substitute the executor service with a custom {{ThreadPoolExecutor}} that overrides the {{afterExecute()}} hook:

The {{ExecutorService.submit()}} method can be used (in place of the {{execute()}} method) to submit a task to a thread pool and obtain a {{Future}} object. When the task is submitted via  {{ExecutorService.submit()}}, thrown exceptions never reach the uncaught exception handler because the thrown exception is considered to be part of the return status and is consequently wrapped in an {{ExecutionException}} and rethrown by {{Future.get()}} \[[Goetz 2006|AA. Bibliography#GoetzReferences#Goetz 06]\].