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lang-java
apply(): that's not a problem. The executor just consumes from an existing queue, it's never accessed directly, so no problem if it's created later. I'm more worried about several threads creating several executors. 3. Asynchronizedblock would definitely work, yes; however, it makes my admittedly complex code even more complex. You're right that, in this case, it's probably not worth it; so I've decided to just let the executor be. +1.