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https://issues.apache.org/jira/browse/CAMEL-25940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on CAMEL-25940 started by Claus Ibsen.
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> camel-jsonpath - a NullPointerException when resultType is java.util.Map and
> the path gives one value that is not a map
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-25940
> URL: https://issues.apache.org/jira/browse/CAMEL-25940
> Project: Camel
> Issue Type: Bug
> Components: camel-jsonpath
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: 4.24.0
>
>
> A jsonpath expression whose path gives a list of values that are not maps,
> with {{resultType}} set to {{java.util.Map}}, fails with a
> {{NullPointerException}} instead of a conversion result or a clear error.
> *Reproduce*
> Body:
> {code}
> [{"sku":"X","qty":42},{"sku":"Y","qty":0}]
> {code}
> Expression {{$[?(@.sku == 'X')].qty}} with {{resultType: java.util.Map}}:
> {code}
> org.apache.camel.ExpressionEvaluationException: java.lang.NullPointerException
> Caused by: java.lang.NullPointerException
> at java.util.Objects.requireNonNull(Objects.java:220)
> at java.util.Optional.of(Optional.java:113)
> at java.util.stream.FindOps$FindSink$OfRef.get(FindOps.java:194)
> {code}
> *Cause*
> {{JsonPathExpression.evaluate}} (camel-jsonpath) converts each element of a
> list result to the result type. Integer to Map has no converter, so the
> element becomes null. The list of one element is then unwrapped with
> {{col.stream().findFirst().get()}}, and {{findFirst()}} throws an NPE when
> the element it picks is null:
> {code:java}
> } else if (result instanceof Collection<?> col) {
> // convert each element in the list
> result = col.stream()
> .filter(Objects::nonNull) // skip null
> .map(item ->
> exchange.getContext().getTypeConverter().convertTo(resultType, exchange,
> item))
> .collect(Collectors.toList());
> }
> if (result instanceof Collection<?> col && col.size() == 1) {
> result = col.stream().findFirst().get();
> }
> {code}
> The code came with CAMEL-20508, which aligned the conversion to resultType
> with camel-jq.
> *Expected*
> The unwrap should handle a null element, for example with
> {{col.iterator().next()}}, so the result is null, or the conversion that
> fails should say which element could not be converted to the result type.
> Either way, no NPE.
> Found in the review of https://github.com/apache/camel/pull/28210: the AI
> tools there point to {{resultType: java.util.Map}} for a filter.
> https://github.com/apache/camel/pull/28253 stops giving that advice for a
> path that goes on after the filter.
> _Claude Code on behalf of davsclaus_
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