Github user chtyim commented on a diff in the pull request:

    https://github.com/apache/twill/pull/58#discussion_r132296875
  
    --- Diff: 
twill-yarn/src/main/java/org/apache/twill/internal/appmaster/ApplicationMasterService.java
 ---
    @@ -193,7 +200,91 @@ private EventHandler 
createEventHandler(TwillSpecification twillSpec) throws Cla
         
Preconditions.checkArgument(EventHandler.class.isAssignableFrom(handlerClass),
                                     "Class {} does not implements {}",
                                     handlerClass, 
EventHandler.class.getName());
    -    return Instances.newInstance((Class<? extends EventHandler>) 
handlerClass);
    +    final EventHandler delegate = Instances.newInstance((Class<? extends 
EventHandler>) handlerClass);
    +    if (delegate == null) {
    +      // if no handler is specified, return an EventHandler with no-op
    +      return new EventHandler() {};
    +    }
    +    // wrap the delegate EventHandler so that all errors will be caught
    +    return new EventHandler() {
    +
    +      @Override
    +      public void started() {
    +        try {
    +          delegate.started();
    +        } catch (Throwable t) {
    +          LOG.warn("Exception when calling {}.started()", 
eventHandler.getClass().getName(), t);
    --- End diff --
    
    `Exception raised when...`


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