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From "Hadrian Zbarcea (JIRA)" <>
Subject [jira] Created: (CAMEL-154) Improper wiring of camel context using Spring
Date Mon, 24 Sep 2007 14:33:23 GMT
Improper wiring of camel context using Spring

                 Key: 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

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="">
    <endpoint id="endpoint1" uri="direct:start"/>
    <endpoint id="endpoint2" uri="mock:end"/>

      <from ref="endpoint1"/>
      <to ref="endpoint2"/>
The jaxb parser instantiates the BeanPostProcessor, endpoints, the RouteType, From/ToTypes
properly, but the BeanPostProcessor is not injected with the camelContext and applicationContext,

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.

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