[GitHub] [servicecomb-java-chassis] WellaceZ opened a new issue #1606: servicecomb可否定制全部的Handler？&servicecomb退出时为何会关闭非守护线程？

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WellaceZ opened a new issue #1606: servicecomb可否定制全部的Handler？&servicecomb退出时为何会关闭非守护线程？
URL: https://github.com/apache/servicecomb-java-chassis/issues/1606
 
 
   有两个问题咨询下：
   1.SCBEngine在进行初始化时，会进行ProducerProvider的初始化
   ![image](https://user-images.githubusercontent.com/53045286/75648705-d3180e00-5c8b-11ea-9621-97a4a2868cdb.png)
   可以看到框架指定了最后一个Handler——ProducerOperationHandler，这个Handler作用就是为了进行validator检验的吗？我可否不使用这个Handler？
   
   2.我在自定义的BootListener监听器中，监听了BEFORE_CLOSE事件：
   public abstract class AppShutdownBootListener implements BootListener {
       public void onBootEvent(BootEvent bootEvent) {
           switch(bootEvent.getEventType()) {
           case BEFORE_CLOSE:
               this.onBeforeClose();
               break;
           default:
               return;
           }
       }
       private void onBeforeClose() {
           LOGGER.debug("before close event start");
           this.thread = new Thread(() -> {
              ......
           }, "GroupExecutor-monitor-thread");
           this.thread.setDaemon(false);
           this.thread.start();
       }
   }
   在这个事件中，我开启了一个非守护线程，但是为何随着ServiceComb的JVM钩子线程的结束，进程就退出了，jvm不是会等待所有的非守护线程结束吗，ServiceComb做了其他操作吗？

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