java - Spring ThreadPoolTask​​Executor 永远不会超出 corePoolSize

Question

我已经配置了 Spring ThreadPoolTask​​Executor，考虑到至少有 16 个线程，根据需要最多可达 256 个:

<bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
    <property name="corePoolSize" value="16"/>
    <property name="maxPoolSize" value="256"/>
    <property name="queueCapacity" value="256"/>
</bean>

但是正如我从日志中看到的，线程池大小从未超过corePoolSize:

Thread pool size: 16/256, active count: 16

为什么会这样？我做错了什么？

Answer 1

明白了:

If there are more than corePoolSize but less
than maximumPoolSize threads running,
a new thread will be created only if the queue is full.

所以解决办法就是缩小队列!