Java 如何避免在抛出异常时线程池中的线程死机，而不使用try-catch

我的代码如下所示：

public class ExceptionTest {
    public static Logger log = LoggerFactory.getLogger(ExceptionTest.class);
    public final static ThreadFactory factory = new ThreadFactory() {
        @Override
        public Thread newThread(Runnable target) {
            final Thread thread = new Thread(target);
            log.debug("Creating new worker thread");
            thread.setUncaughtExceptionHandler(new UncaughtExceptionHandler() {
                @Override
                public void uncaughtException(Thread t, Throwable e) {
                    log.error("Uncaught Exception", e);
                }
            });
            return thread;
        }

    };
    final static ExecutorService executor = Executors.newCachedThreadPool(factory);
    public static void main(String[] args) {
        executor.execute(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    System.out.println(Thread.currentThread().getName());
                    int i = 1;
                    int j = 0;
                    System.out.println(i / j);
                }
            }
        });
    }

}

public class WrapperRunnable implements Runnable {

    Runnable runnable;

    public WrapperRunnable(Runnable runnable) {
        this.runnable = runnable;
    }

    @Override
    public void run() {
        while (true) {
            try {
                runnable.run();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

---

控制台只打印一次消息。这意味着线已经死了。有没有其他方法可以防止线程死机（除了

try-catch

block，这是大量重复的代码）。

没有

try…catch

block，您无法实现这一点，请参阅：

如果找不到可以处理异常的catch子句，则 当前线程（遇到异常的线程）为 终止

---

而且，我不认为在缓存线程池中终止线程是一个问题，因为下次提交新任务时，将创建一个新线程来处理它

---

如果这真的很重要，并且您不希望重复代码，您可以编写如下包装器类：

public class ExceptionTest {
    public static Logger log = LoggerFactory.getLogger(ExceptionTest.class);
    public final static ThreadFactory factory = new ThreadFactory() {
        @Override
        public Thread newThread(Runnable target) {
            final Thread thread = new Thread(target);
            log.debug("Creating new worker thread");
            thread.setUncaughtExceptionHandler(new UncaughtExceptionHandler() {
                @Override
                public void uncaughtException(Thread t, Throwable e) {
                    log.error("Uncaught Exception", e);
                }
            });
            return thread;
        }

    };
    final static ExecutorService executor = Executors.newCachedThreadPool(factory);
    public static void main(String[] args) {
        executor.execute(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    System.out.println(Thread.currentThread().getName());
                    int i = 1;
                    int j = 0;
                    System.out.println(i / j);
                }
            }
        });
    }

}

public class WrapperRunnable implements Runnable {

    Runnable runnable;

    public WrapperRunnable(Runnable runnable) {
        this.runnable = runnable;
    }

    @Override
    public void run() {
        while (true) {
            try {
                runnable.run();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

并将

WrapperRunnable

提交给执行者：

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
        int i = 1;
        int j = 0;
        System.out.println(i / j);
    }
};
WrapperRunnable wrapperRunnable = new WrapperRunnable(runnable);
executor.execute(wrapperRunnable);