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https://issues.apache.org/jira/browse/CAMEL-25455?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-25455.
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Resolution: Fixed
> camel-wasm - the wasm predicate never matches a Boolean, String or byte[]
> result
> --------------------------------------------------------------------------------
>
> Key: CAMEL-25455
> URL: https://issues.apache.org/jira/browse/CAMEL-25455
> Project: Camel
> Issue Type: Bug
> Reporter: shashank
> Assignee: shashank
> Priority: Minor
> Fix For: 4.23.0
>
>
> {{WasmExpression.matches()}} (camel-wasm, main e1bdb2f124b4, line 142) only
> returns true for a Jackson {{BooleanNode}} or a non-empty
> {{java.util.Collection}}; every other result is false. The result type of the
> {{wasm}} language defaults to {{byte[]}} (the raw bytes the function
> returns), so as a predicate it never matches:
> {code:java}
> from("direct:in")
> .filter().wasm("is_valid", "classpath:functions.wasm") // byte[]
> result: never passes
> .to("direct:valid");
> {code}
> With {{resultType}} {{Boolean}} the expression evaluates to {{Boolean.TRUE}}
> and {{matches()}} still returns false; the same with {{String}}. A predicate
> only works with {{resultType=com.fasterxml.jackson.databind.JsonNode}} plus a
> Jackson type converter on the classpath (camel-jackson is not a dependency of
> camel-wasm), which is not documented. The checks date from the original
> contribution (CAMEL-20336) and match camel-jq, whose result is always a
> {{JsonNode}}.
> h3. Reproduction
> {{filter().wasm("transform", "functions.wasm", resultType)}} with the
> {{functions.wasm}} module of the camel-wasm tests ({{transform}} upper-cases
> the body) and bodies {{false}}, empty and {{true}}: on main no message passes
> for {{byte[]}}, {{String}} or {{Boolean}} ({{mock://result Received message
> count. Expected: <1> but was: <0>}}, two runs). A survey probe with a guest
> that returns {{true}}: {{evaluate}} -> {{true}} ({{java.lang.Boolean}}),
> {{matches}} -> {{false}}; the Filter EIP passed 0 of 1.
> h3. Proposed fix
> Evaluate the result with {{ObjectHelper.evaluateValuePredicate}} like
> {{ExpressionSupport}}, camel-bean and camel-quickjs ({{Boolean}} as is,
> {{true}}/{{false}} text in any case, empty is false, other non-null values
> true), converting a {{byte[]}} result to a {{String}} with the exchange
> charset first. Keep the JSON case as it is: a {{JsonNode}} only matches when
> it is the boolean {{true}}. Docs: a predicate section in the language page; a
> short upgrade-guide note since predicates that never matched can now match.
> Affected: since 4.5 (the wasm language), main included.
> Duplicate check (2026-10-07): no camel-wasm JIRA component; text search
> "wasm" finds CAMEL-20336, CAMEL-21569, CAMEL-24059 (all resolved, none about
> predicates). GitHub pull requests "wasm": none open on this.
> _Filed with Claude Code on behalf of allthingssecurity._
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