ThreadPoolExecutor的LinkedBlockingQueue 大小设置为10000，会溢出吗？
private final ExecutorService es = new ThreadPoolExecutor(8, 10, 100, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(10000));
回答：不会。
下面分析下原因：
ThreadPoolTaskExecutor是spring core包中的，而ThreadPoolExecutor是JDK中的JUC。ThreadPoolTaskExecutor是对ThreadPoolExecutor进行了封装处理。
看看下面ThreadPoolTaskExecutor的源码：
LinkedBlockingQueue Default is {@code Integer.MAX_VALUE}.
public class ThreadPoolTaskExecutor extends ExecutorConfigurationSupportimplements AsyncListenableTaskExecutor, SchedulingTaskExecutor {private final Object poolSizeMonitor = new Object();private int corePoolSize = 1;private int maxPoolSize = Integer.MAX_VALUE;private int keepAliveSeconds = 60;private int queueCapacity = Integer.MAX_VALUE;private boolean allowCoreThreadTimeOut = false;private TaskDecorator taskDecorator;private ThreadPoolExecutor threadPoolExecutor;/*** Note: This method exposes an {@link ExecutorService} to its base class* but stores the actual {@link ThreadPoolExecutor} handle internally.* Do not override this method for replacing the executor, rather just for* decorating its {@code ExecutorService} handle or storing custom state.*/@Overrideprotected ExecutorService initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) {BlockingQueue<Runnable> queue = createQueue(this.queueCapacity);ThreadPoolExecutor executor;if (this.taskDecorator != null) {executor = new ThreadPoolExecutor(this.corePoolSize, this.maxPoolSize, this.keepAliveSeconds, TimeUnit.SECONDS,queue, threadFactory, rejectedExecutionHandler) {@Overridepublic void execute(Runnable command) {super.execute(taskDecorator.decorate(command));}};}else {executor = new ThreadPoolExecutor(this.corePoolSize, this.maxPoolSize, this.keepAliveSeconds, TimeUnit.SECONDS,queue, threadFactory, rejectedExecutionHandler);}if (this.allowCoreThreadTimeOut) {executor.allowCoreThreadTimeOut(true);}this.threadPoolExecutor = executor;return executor;}/*** Set the capacity for the ThreadPoolExecutor's BlockingQueue.* Default is {@code Integer.MAX_VALUE}. * <p>Any positive value will lead to a LinkedBlockingQueue instance;* any other value will lead to a SynchronousQueue instance.* @see java.util.concurrent.LinkedBlockingQueue* @see java.util.concurrent.SynchronousQueue*/public void setQueueCapacity(int queueCapacity) {this.queueCapacity = queueCapacity;}
从上面的源码可以看出，也就是说我们平常使用的Spring封装的异步线程类，他默认LinkedBlockingQueue为 Integer.MAX_VALUE大，我们天天都在用的异步执行器，天天都在正常使用！！！
现在我们直接设置ThreadPoolExecutor的LinkedBlockingQueue的大小为10000（远远小于Integer.MAX_VALUE），那肯定不会内存溢出的。