捕获由主线程中的工作线程创建的异常

Question

How do we handle the Exceptions generated from threads started by ThreadPoolTaskExecutor in main thread?

public static void main(String[] args){
     ApplicationContext context =  new ClassPathXmlApplicationContext("applicationContext.xml");
     ThreadPoolTaskExecutor executer = (ThreadPoolTaskExecutor)context.getBean("taskExecutor_test");

     for(int i=0; i<5; i++){
        executer.execute(new RunnableImpl()); //If any of the thread create exception
     }

    //need to catch the exceptions here.
}

[like what we do with 'setUncaughtExceptionHandler' in normal Thread]

Answer 1

When submitting tasks to the ThreadPoolTaskExecutor , you're expecting those tasks to be run asynchronously, so your code can't catch and handle exceptions unless you block and wait for them to happen.

To do this, use ThreadPoolTaskExecutor#submit(Runnable) which returns a Future . You can then call Future#get() to block the current thread and wait for either the task to complete or for an exception to be thrown (which completes (fails) the task). If it's a long running task, you can also poll for its completion with its Future#isDone() or the overloaded get(..) method.