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From "Aaron Mulder" <ammul...@alumni.princeton.edu>
Subject Python Expressions
Date Tue, 01 Jul 2008 01:10:23 GMT
So I'm also having trouble trying out Python expressions.  If I do this:

        <route>
            <from uri="activemq:topic:ScriptTest" />
            <choice>
                <when>
                    <python>request.headers['console'] == 'Wii'</python>
                    <to uri="bean:test?methodName=handleWii" />
                </when>

Then I get this:

java.lang.NullPointerException
	at org.apache.camel.builder.script.ScriptBuilder.matches(ScriptBuilder.java:457)
	at org.apache.camel.builder.script.ScriptBuilder.matches(ScriptBuilder.java:83)
	at org.apache.camel.builder.script.ScriptBuilder.matches(ScriptBuilder.java:49)
	at org.apache.camel.processor.ChoiceProcessor.process(ChoiceProcessor.java:47)
	at org.apache.camel.impl.converter.AsyncProcessorTypeConverter$ProcessorToAsynProcessorBridge.process(AsyncProcessorTypeConverter.java:44)
	at org.apache.camel.processor.DeadLetterChannel.process(DeadLetterChannel.java:143)
	at org.apache.camel.processor.DeadLetterChannel.process(DeadLetterChannel.java:87)
	at org.apache.camel.processor.Pipeline.process(Pipeline.java:101)
	at org.apache.camel.processor.Pipeline.process(Pipeline.java:85)
	at org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:40)
...

It almost seems like the Python expression is returning null instead
of the expected boolean?  I tried putting a "return" in there to no
avail.  If I mess up the syntax it says so (for example,
request.headers.console does not work in Python), so it's doing
*something* -- I just don't see why the expression isn't working.

Any ideas?


FWIW, so far I'm OK with EL, OGNL, Groovy, and JXPath.  No dice with
Ruby or Python.

Thanks,
       Aaron

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