在春季创建ThreadPoolExecutor会导致内存泄漏? [英] Creating ThreadPoolExecutor in spring cause memory leak?

问题描述

我正在使用Spring，在RequestMap方法中，我的代码如下:

I am working with Spring, and in a RequestMap method I have code like below:

@RequestMap
public void someMethod() {
    ThreadPoolExecutor executor = Executors.newFixedThreadPool(N);
    executor.submit(new Runnable());
    executor.submit(new Runnable());
}

然后，即使每一个Runnable应该在几秒钟内完成，我仍然收到OOM错误.分析堆转储后，我发现有成千上万个Thread对象.

Then I keep get OOM error even every Runnable should be finished in seconds. After analysing the heap dump, I found there are thousands Thread objects.

然后我用Executors.newCachedThreadPool将executor更改为singlton，此问题已解决.

Then I changed executor to singlton with Executors.newCachedThreadPool, this problem was fixed.

据我了解，该方法返回后，没有对线程池的引用，因此应该对其进行垃圾回收，但事实是线程仍在堆中.为什么?

As far as my understand, after the method returned, there is no reference to the thread pool, so it should be garbage-collected, but the fact is the thread still on the heap. Why?

推荐答案

是的，这将泄漏内存. 如文档中所述 :

Yes, this will leak memory. As it says in the documentation:

应关闭未使用的ExecutorService，以回收其资源.

An unused ExecutorService should be shut down to allow reclamation of its resources.

关闭执行程序(

Shut down the executor (executor.shutdown()), or reuse it.

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