Impossible to make a cached thread pool with a size limit?

Question

It seems to be impossible to make a cached thread pool with a limit to the number of threads that it can create.

Here is how static Executors.newCachedThreadPool is

Answer 1

In your first example, subsequent tasks are rejected because the AbortPolicy is the default RejectedExecutionHandler. The ThreadPoolExecutor contains the following policies, which you can change via the setRejectedExecutionHandler method:

CallerRunsPolicy
AbortPolicy
DiscardPolicy
DiscardOldestPolicy

It sounds like you want cached thread pool with a CallerRunsPolicy.