Github user aledsage commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/408#discussion_r86738337
--- Diff:
camp/camp-brooklyn/src/main/java/org/apache/brooklyn/camp/brooklyn/spi/dsl/methods/DslComponent.java
---
@@ -144,7 +147,7 @@ public Entity call() throws Exception {
protected Maybe<Entity> callImpl(boolean immediate) throws
Exception {
Maybe<Entity> entityMaybe = getEntity(immediate);
- if (immediate && entityMaybe.isAbsent()) {
+ if (immediate && entityMaybe.isAbsentOrNull()) {
--- End diff --
Is this to avoid the `NullPointerException` you saw before
https://github.com/apache/brooklyn-server/pull/404 was merged? I wondered about
this.
The problem with returning `Maybe.of(null)` if the entity can't be resolved
is that it's different semantics from `deferredSupplier.get()`. For the latter,
it would throw `NoSuchElementException` with a nice message explaining it. Now
this will just return a null.
The intent is that `getImmediately()` will either return `absent()` if it
can't be resolved immediately, or will return immediately exactly the same
value as `get()` would.
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