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https://issues.apache.org/jira/browse/CAMEL-24103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24103.
---------------------------------
Resolution: Fixed
> camel-bean: bean method returning null CompletionStage causes opaque
> NullPointerException
> -----------------------------------------------------------------------------------------
>
> Key: CAMEL-24103
> URL: https://issues.apache.org/jira/browse/CAMEL-24103
> Project: Camel
> Issue Type: Bug
> Components: camel-bean
> Affects Versions: 4.21.0
> Reporter: Federico Mariani
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: 4.22.0
>
> Attachments: BeanNullCompletionStageTest.java
>
>
> If a bean method is declared to return {{CompletionStage}} /
> {{CompletableFuture}} but returns {{null}}, {{MethodInfo}} fails with an
> opaque NPE:
> {code:java}
> if (CompletionStage.class.isAssignableFrom(method.getReturnType())) {
> CompletionStage<?> completionStage = (CompletionStage<?>) result; //
> result may be null
> completionStage.whenComplete(...) //
> NPE here
> {code}
> The exchange ends up with {{java.lang.NullPointerException: Cannot invoke
> "java.util.concurrent.CompletionStage.whenComplete(java.util.function.BiConsumer)"
> because "completionStage" is null}} — no hint about which bean/method caused
> it.
> Returning a null future is bad practice, but the error should identify the
> bean method (e.g. a {{RuntimeCamelException}} naming the method), consistent
> with how other invalid results are reported.
> *Reproducer*
> Attached test {{BeanNullCompletionStageTest}} fails on main (4.22.0-SNAPSHOT)
> demonstrating the raw NPE as the exchange exception.
> _This issue was found by an AI-assisted code review. Reported by Claude Code
> on behalf of [~fmariani] (GitHub: Croway)._
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