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From "Don Coleman (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CAMEL-655) Jython Expressions always return null/false
Date Tue, 08 Jul 2008 06:08:00 GMT

     [ https://issues.apache.org/activemq/browse/CAMEL-655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Don Coleman updated CAMEL-655:
------------------------------

    Attachment: CAMEL-655.patch.txt

The Jython JSR-223 engine defaults to compiling code in "exec" mode.
Changing this to "eval" mode allows Py.runCode() to return results to engine.eval()

{code}
if (isPython()) {
            ScriptContext context = engine.getContext();
            context.setAttribute("com.sun.script.jython.comp.mode", "eval", ScriptContext.ENGINE_SCOPE);
        }
{code}

> Jython Expressions always return null/false
> -------------------------------------------
>
>                 Key: CAMEL-655
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-655
>             Project: Apache Camel
>          Issue Type: Bug
>          Components: camel-script
>    Affects Versions: 1.3.0, 1.4.0
>         Environment: Jython 2.2.1, camel-script 1.3.0/1.4.0-SNAPSHOT, jython integration
lib from java.net or logicblaze.com repo
>            Reporter: Aaron Mulder
>            Assignee: Willem Jiang
>         Attachments: CAMEL-655.patch.txt
>
>
> A Jython expression used for example like this always returns null, which is now translated
to false:
> from("...").choice().when().jython("some expression").to(...)
> For example, here's an expression that always evaluates to null/false:
> request.headers['foo'] == 'bar'
> To see this, look at the test PythonExpressionTest in the camel-script module.

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