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https://issues.apache.org/jira/browse/CAMEL-7428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13994480#comment-13994480
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Claus Ibsen commented on CAMEL-7428:
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Do NOT use literals, but you must have a function on the left hand side, such
as ${body} or ${header.foo}. The simple language is not for evaluating "true ==
true" or "'hello' == 'hello'". That is NOT its purpose. It is for evaluating
data from the Camel Exchange / Message.
> Simple Language - Operators are not evaluated for setting body or headers
> -------------------------------------------------------------------------
>
> Key: CAMEL-7428
> URL: https://issues.apache.org/jira/browse/CAMEL-7428
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 2.12.3, 2.13.0
> Reporter: Peter Keller
>
> Operators are not evaluated if using {{simple}} for setting bodies or headers:
> {code}
> from("direct:simple")
> .setHeader("myHeader").simple("true == true", Boolean.class)
> .log("header = [${header.myHeader}]")
> .setBody(simple("true == true", Boolean.class))
> .log("body = [${body}]");
> {code}
> Output is as follows:
> {code}
> INFO header = [false]
> INFO body = [false]
> {code}
> The outcome should be {{true}} in both cases.
> Also, see
> http://stackoverflow.com/questions/23523409/camel-how-to-set-boolean-header-parameter-using-simple-comparison/23560989#23560989
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