kennknowles commented on a change in pull request #13719:
URL: https://github.com/apache/beam/pull/13719#discussion_r555313479
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File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/windowing/Trigger.java
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@@ -87,7 +88,7 @@ protected Trigger() {
}
public List<Trigger> subTriggers() {
- return subTriggers;
+ return MoreObjects.firstNonNull(subTriggers, Collections.emptyList());
Review comment:
I think also we could enable nullness checking on the subclasses and
discover that the field should never be null. Anyhow this fix makes the API
null-safe so looks good even though I think it can go further.
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