java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1f303192 rejected from java.util.concurrent.ThreadPoolExecutor@11f7cc04[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0] at jav…

INFO | jvm 1 | 2017/03/09 19:45:10 | java.util.concurrent.RejectedExecutionException: event executor terminated INFO | jvm 1 | 2017/03/09 19:45:10 | at io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:805) INFO…

java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@59f1ca76 rejected from java.util.concurrent.ThreadPoolExecutor@76105c88[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 1] at jav…

java.util.concurrent.RejectedExecutionException at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1768) at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:767) at java.util.concurr…

Exception in thread "main" java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@4e25154f rejected from java.util.concurrent.ScheduledThreadPoolExecutor at java.util.concurrent…

异常引发的问题: 线程模型 如果事件处理的逻辑能迅速完成,并且不会发起新的 IO 请求,⽐如只是在内存中记个标识,则直接在 IO 线程上处理更快,因为减少了线程池调度. 但如果事件处理逻辑较慢,或者需要发起新的 IO 请求,⽐如需要查询数据库,则必须派发到线程池,否则 IO 线程阻塞,将导致不能接收其它请求. 如果⽤ IO 线程处理事件,⼜在事件处理过程中发起新的 IO 请求,⽐如在连接事件中发起登录请求,会报“可能引发死锁”异常,但不会真死锁. 因此,需要通过不同的派发策略和不同的线程池配置的…

newFixedThreadPool 创建一个固定大小的线程池. shutdown():用于关闭启动线程,如果不调用该语句,jvm不会关闭. awaitTermination():用于等待子线程结束,再继续执行下面的代码.该例中我设置一直等着子线程结束. Java代码 收藏代码 public class Test { public static void main(String[] args) throws IOException, InterruptedException { Executor…

java.util.concurrent.ThreadPoolExecutor An ExecutorService that executes each submitted task using one of possibly several pooled threads, normally configured using Executors factory methods. Thread pools address two different problems: they usually…

这一部分来说说线程池如何进行状态控制,即线程池的开启和关闭. 先来说说线程池的开启,这部分来看ThreadPoolExecutor构造方法: public ThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, RejectedExecut…

原子类java.util.concurrent.atomic.*原理分析 在并发编程下,原子操作类的应用可以说是无处不在的.为解决线程安全的读写提供了很大的便利. 原子类保证原子的两个关键的点就是:可见性和写数据一致性. 对修改可见 使用volatile来保证读取到最新的数据. volatile语义: 用简单的文字来讲,volatile保证了Java共享变量在多线程环境下对读可见的特性.因为它不是Java语言级别的锁,所以不会造成上下文切换,使用恰当的情况下比锁有更好的性能. 底层原理: vol…