Github user chtyim commented on a diff in the pull request:
https://github.com/apache/twill/pull/58#discussion_r132295847
--- Diff:
twill-yarn/src/main/java/org/apache/twill/internal/appmaster/ApplicationMasterService.java
---
@@ -181,7 +189,6 @@ public Reader getInput() throws IOException {
}
@SuppressWarnings("unchecked")
- @Nullable
private EventHandler createEventHandler(TwillSpecification twillSpec)
throws ClassNotFoundException {
// Should be able to load by this class ClassLoader, as they packaged
in the same jar.
EventHandlerSpecification handlerSpec = twillSpec.getEventHandler();
--- End diff --
if `handlerSpec` is `null`, you still want to return a no-op handler, right?
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