False positive on JDK 27

[mpkorstanje]

After upgrading error_prone_core to v2.49.0 and nullaway to v0.13.3 together (due to #1511) in junit-team/junit-framework#5589, https://github.com/junit-team/junit-framework/actions/runs/24429467026/job/71370536336?pr=5589 fails on junit-team/junit-framework@bc2ffac with a false positive.

@Override
	public void close() {
		if (!this.closed) {
			try {
				if (this.closeAction != null) {
					List<Throwable> failures = new ArrayList<>();
					this.storedValues.entrySet().stream() //
							.map(e -> EvaluatedValue.createSafely(e.getKey(), e.getValue())) //
							.filter(Objects::nonNull) //
							.sorted(EvaluatedValue.REVERSE_INSERT_ORDER) //
							.forEach(it -> {
								try {
									it.close(this.closeAction);
								}
								catch (Throwable t) {
									UnrecoverableExceptions.rethrowIfUnrecoverable(t);
									failures.add(t);
								}
							});
					if (!failures.isEmpty()) {
						var iterator = failures.iterator();
						var throwable = iterator.next();
						iterator.forEachRemaining(throwable::addSuppressed);
						throw throwAsUncheckedException(throwable);
					}
				}
			}
			finally {
				this.closed = true;
			}
		}
	}

With:

home/runner/work/junit-framework/junit-framework/junit-platform-engine/src/main/java/org/junit/platform/engine/support/store/NamespacedHierarchicalStore.java:146: warning: [NullAway] dereferenced expression it is @Nullable

									it.close(this.closeAction);
									  ^
    (see http://t.uber.com/nullaway )

Here it can not be null because .filter(Objects::nonNull) was applied. The same false positive doesn't show up on JDK 26 and below.

Probably immediately detected once #1525 is resolved, but I didn't want to keep this from you either.

[msridhar]

Thanks for the report! I think I tracked down the root cause. Aiming to have a fix soon.