工作中遇到了一个线程中断异常，备忘记录一下。

主线程使用CompletableFuture开辟子线程进行了并行查询，但其中某个子线程执行时发生异常，没有捕获。
结果就在主线程等待所有子线程都执行完毕时报ExecutionException
从而对主线程打上了中断标识

而主线程随后又进行了数据查询，这时候从druid数据库连接池中获取数据连接会用到AQS中的可重入锁, 可重入锁会检查线程的中断标识，如果是中断，则抛出中断异常

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;public class TestInterrupt {public static void main(String[] args) throws InterruptedException {CompletableFuture[] asyncList = new CompletableFuture[]{CompletableFuture.runAsync(() -> {int a = 1/0;}),CompletableFuture.runAsync(() -> {int b = 1;})};try {CompletableFuture.allOf(asyncList).get(3, TimeUnit.SECONDS);} catch (InterruptedException | ExecutionException | TimeoutException e) {e.printStackTrace();Thread.currentThread().interrupt();}if(Thread.currentThread().isInterrupted()){//主线程被中断了throw new InterruptedException("主线程被中断了!");}}
}

执行结果：

java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1928)
at com.util.TestStream.main(TestStream.java:35)
Caused by: java.lang.ArithmeticException: / by zero
at com.util.TestStream.lambda$main$0(TestStream.java:28)atjava.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640)
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632)atjava.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)atjava.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1067)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1703)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:172)
Exception in thread “main” java.lang.InterruptedException: 主线程被中断了!
at com.util.TestStream.main(TestStream.java:43)