Improper wiring of camel context using Spring
---------------------------------------------
Key: CAMEL-154
URL: https://issues.apache.org/activemq/browse/CAMEL-154
Project: Apache Camel
Issue Type: Bug
Components: camel-spring
Affects Versions: 1.2.0
Reporter: Hadrian Zbarcea
When using spring to wire camel components, the whole magic is driven by
org.springframework.context.support.AbstractApplicationContext.refresh().
At about line 327 the xml file is read and at some point
AbstractApplicationContext.doParse is called. What is notable is that we use
parseUsingJaxb (line 135) instead of the spring way of doing things, and then
we still use
BeanDefinitionParser(s) to build the BeanDefinition(s).
On a sample context definition like the one in the unit tests:
<camelContext id="camel"
xmlns="http://activemq.apache.org/camel/schema/spring";>
<beanPostProcessor/>
<endpoint id="endpoint1" uri="direct:start"/>
<endpoint id="endpoint2" uri="mock:end"/>
<route>
<from ref="endpoint1"/>
<to ref="endpoint2"/>
</route>
</camelContext>
The jaxb parser instantiates the BeanPostProcessor, endpoints, the RouteType,
From/ToTypes properly, but the BeanPostProcessor is not injected with the
camelContext and applicationContext, obviously.
Later on in AbstractApplicationContext.refresh() during the
registerBeanPostProcessors() call (line 337) spring figures out that it needs
to instantiate the BeanPostProcessor first and use it before it initializes the
other beans. So far so good, but in doing so there are 2 major problems.
1. It uses the BeanDefinition instead of the instance already created during
jaxb parsing.
2. There is a chicken and egg situation; while it initializes
"camel:beanPostProcessor", it looks for a "camel" bean which isn't registered
yet. The model for it does exist though, so a new instance of the
CamelContextFactoryBean gets instantiated (and the id now is null instead of
"camel" as in the spring xml).
I wrestled with this and couldn't figure out a solution.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
