[jira] [Work started] (CAMEL-11225) Deadlock in component creation

["Luca Burgazzoli (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CAMEL-11225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on CAMEL-11225 started by Luca Burgazzoli.
-----------------------------------------------
> Deadlock in component creation 
> -------------------------------
>
>                 Key: CAMEL-11225
>                 URL: https://issues.apache.org/jira/browse/CAMEL-11225
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-core, camel-spring
>            Reporter: Luca Burgazzoli
>            Assignee: Luca Burgazzoli
>             Fix For: 2.20.0
>
>
> There are circumstances in which the component creation could enter in a deadlock, let's have a look at the following spring example:  
> {code:xml}
> <beans xmlns="http://www.springframework.org/schema/beans"
>        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>        xsi:schemaLocation="
>          http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
>          http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">
>  
>   <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
>     <route id="twitter-route">
>       <from id="twitter" uri="twitter://timeline/home?type=polling"/>
>       <log id="route-log" message="Got ${body}"/>
>     </route>
>   </camelContext>
>  
> </beans>
> {code}
> The critical part is:
> {code:xml}
>   <from id="twitter" uri="twitter://timeline/home?type=polling"/>
> {code}
> What happens is that:
> - because there is an id, camel registers a CamelEndpointFactoryBean to the spring application contex
> - the endpoint is then resolved which involve the  instantiation of the component (twitter in this case) which invoke CamelContext.getComponent
> - when the component is being created it then uses the component resolver which goes down to the registry to find out if the requested component is already there
> - as in the registry there is a bean factory with the same name as the component we want to create, spring invokes the factory which then goes down to CamelContext.getComponent
> - then deadlock 



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