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

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…

于谈论高并发(十一)几个自旋锁的实现(五岁以下儿童)中使用了java.util.concurrent.atomic.AtomicStampedReference原子变量指向工作队列的队尾,为何使用AtomicStampedReference原子变量而不是使用AtomicReference是由于这个实现中等待队列的同一个节点具备不同的状态,而同一个节点会多次进出工作队列,这就有可能出现出现ABA问题. 熟悉并发编程的同学应该知道CAS操作存在ABA问题.我们先看下CAS操作. CAS(Compar…

今天在Android Studio中把另外一个项目引入当前项目,编译的时候出现了java.util.zip.ZipException: duplicate entry错误. 错误如下所示: FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':watch:packageAllDebugClassesForMultiDex'. > java.util.zip.ZipExcept…

今天在Android Studio中把另外一个项目引入当前项目,编译的时候出现了java.util.zip.ZipException: duplicate entry错误. 错误例如以下所看到的: FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':watch:packageAllDebugClassesForMultiDex'. > java.util.zip.ZipEx…

最近用 java 对一个很大的 CSV 文件进行处理.打算用 Scanner 逐行扫描进来,结果报错 "java.util.nosuchelementexception:no line found". 在网上查,说是已经没有下一行,但是我已经进行了 scan.hasNext() 检验.然后用 VScode 打开看到编码方式是 UTF-8 with BOM,然后看文档发现 Scanner 有 Scanner(File file, String charsetName) 的构造器(传送门)…

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…