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https://issues.apache.org/jira/browse/CAMEL-19160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17701956#comment-17701956
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Freeman Yue Fang commented on CAMEL-19160:
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Hi [~davsclaus],
Thanks for the feedback!
More background of this issue, [~jondruse] drew me attention through this
[PR|https://github.com/apache/camel-quarkus/pull/4653] on Camel Quarkus.
We found that if we put code like
{code}
GetPersonResponse reply = new GetPersonResponse();
reply.setPersonId(request.getPersonId() + "2");
exchange.getMessage().setBody(reply);
{code}
and we expect convert mechanism can kick in and change type from
GetPersonResponse to org.apache.camel.component.cxf.common.CxfPayload. This
test fails randomly. After debugging, I found that we have two fallback
converter on the classpath, one is
org.apache.camel.converter.jaxb.FallbackTypeConverter.convertTo from
camel-jaxb, another one is
org.apache.camel.component.cxf.converter.CxfPayloadConverter.convertTo from
camel-cxf, but which one will be used first is uncertain. So for the expected
"GetPersonResponse to org.apache.camel.component.cxf.common.CxfPayload"
convert, if the fallback converter from
org.apache.camel.converter.jaxb.FallbackTypeConverter.convertTo is used, the
test passes, otherwise(the fallback converter from camel-cxf is used) it fails.
The interesting thing is this uncertainty only happens in CEQ runtime, I've
never seen this behaviour in CSB/OSGi/standalone.
My original fix was about to add an Object-->String converter in camel-jaxb so
that I can leverage jaxb marshaller there and I can call it from camel-cxf
converter if necessary. I understand that this is too general and risky. How
about if I add Object-->Document/Element converter in camel-jaxb instead, is it
OK? Or in camel, do we have mechanism to order fallback converter if there were
many on the classpath? I know we can order normal converters from the same
bulkloader but seems we can't order fallback converters. What your suggestions
to resolve this issue?
Thanks!
Freeman
> add Object to String converter method to camel-jaxb
> ---------------------------------------------------
>
> Key: CAMEL-19160
> URL: https://issues.apache.org/jira/browse/CAMEL-19160
> Project: Camel
> Issue Type: Improvement
> Components: camel-jaxb
> Reporter: Freeman Yue Fang
> Assignee: Freeman Yue Fang
> Priority: Major
>
> So we get the change to return xml fragment(jaxb marshaller) from the object
> if necessary.
> registry.lookup(String.class, Object.class) can return the jaxb converter if
> camel-jaxb is on the classpath
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