void rejectedExecution(Runnable r, ThreadPoolExecutor executor)
executecannot accept a task. This may occur when no more threads or queue slots are available because their bounds would be exceeded, or upon shutdown of the Executor.
In the absence of other alternatives, the method may throw
RejectedExecutionException, which will be
propagated to the caller of
r- the runnable task requested to be executed
executor- the executor attempting to execute this task
RejectedExecutionException- if there is no remedy
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