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https://issues.apache.org/jira/browse/CAMEL-23819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-23819.
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Resolution: Fixed
> camel-milo (browse): NullPointerException in Camel Milo Browse with Siemens S7
> ------------------------------------------------------------------------------
>
> Key: CAMEL-23819
> URL: https://issues.apache.org/jira/browse/CAMEL-23819
> Project: Camel
> Issue Type: Bug
> Components: camel-milo
> Affects Versions: 4.20.0
> Reporter: Robin Mattes
> Priority: Minor
> Fix For: 4.21.0
>
>
> Component: camel-milo (OPC UA Browse Producer)
> *Problem:*
> When browsing the OPC UA node tree of a Siemens S7 PLC, a
> NullPointerException occurred in MiloBrowseProducer. The S7's OPC UA server
> returns null for BrowseResult.getReferences() on certain nodes (e.g., leaf
> nodes or nodes without child references), rather than returning an empty
> array. The stream pipeline in the browse result processing did not account
> for this, causing a NPE when Stream::of was called on a null reference array.
> *Root Cause:*
> The code at MiloBrowseProducer.java:114 assumed that
> BrowseResult.getReferences() always returns a non-null array. The Siemens S7
> OPC UA server implementation violates this assumption by returning null
> references for nodes that have no children or for which browsing is not
> applicable.
> *Solution:*
> A .filter(Objects::nonNull) step was added to the stream pipeline between
> .map(BrowseResult::getReferences) and .flatMap(Stream::of). This filters out
> any null reference arrays before they are passed to Stream::of, gracefully
> skipping nodes without references instead of crashing.
> _Claude Code on behalf of Robin Mattes_
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