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https://issues.apache.org/jira/browse/CAMEL-7390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13978440#comment-13978440
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Nathan Jensen commented on CAMEL-7390:
--------------------------------------
This is related to this spring feature: https://jira.spring.io/browse/SPR-4374
> CamelNamespaceHandler issue when using Spring's
> AbstractRefreshableApplicationContext.setAllowBeanDefinitionOverriding(false)
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-7390
> URL: https://issues.apache.org/jira/browse/CAMEL-7390
> Project: Camel
> Issue Type: Bug
> Components: camel-spring
> Affects Versions: 2.11.2
> Reporter: Nathan Jensen
> Priority: Minor
>
> Some of the Spring ApplicationContext implementations (i.e.
> AbstractRefreshableApplicationContext) allow you to call
> setAllowBeanDefinitionOverriding(false) to enforce that beans initialized by
> spring do not reuse ids. This can be especially helpful in a pluggable
> application where different developers may contribute different spring files.
> CamelNamespaceHandler.registerTemplates() is helpful and automatically
> creates a template and consumerTemplate if they're not defined on a
> camelContext. Unfortunately, if there are multiple camelContexts, then it
> creates a template for each camelContext with the id of "template", which
> will then cause an exception IF the spring application context is not
> allowing bean definition overriding. An example of the exception:
> {noformat}
> Caused by:
> org.springframework.beans.factory.parsing.BeanDefinitionParsingException:
> Configuration problem: Invalid bean definition with name 'template' defined
> in null: Cannot register bean definition [Generic bean: class
> [org.apache.camel.spring.CamelProducerTemplateFactoryBean]; scope=;
> abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0;
> autowireCandidate=true; primary=false; factoryBeanName=null;
> factoryMethodName=null; initMethodName=null; destroyMethodName=null] for bean
> 'template': There is already [Generic bean: class
> [org.apache.camel.spring.CamelProducerTemplateFactoryBean]; scope=;
> abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0;
> autowireCandidate=true; primary=false; factoryBeanName=null;
> factoryMethodName=null; initMethodName=null; destroyMethodName=null] bound.
> Offending resource: class path resource [springfile.xml]
> at
> org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:72)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:82)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.apache.camel.spring.handler.CamelNamespaceHandler.registerTemplates(CamelNamespaceHandler.java:519)
> ~[camel-spring-2.11.2.jar:2.11.2]
> at
> org.apache.camel.spring.handler.CamelNamespaceHandler$CamelContextBeanDefinitionParser.doParse(CamelNamespaceHandler.java:369)
> ~[camel-spring-2.11.2.jar:2.11.2]
> at
> org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser.parseInternal(AbstractSingleBeanDefinitionParser.java:85)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1423)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1413)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:184)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243)
> ~[org.springframework.beans-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
> ~[org.springframework.context-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
> ~[org.springframework.context-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:131)
> ~[org.springframework.context-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:530)
> ~[org.springframework.context-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> at
> org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:444)
> ~[org.springframework.context-3.1.4.RELEASE.jar:3.1.4.RELEASE]
> {noformat}
> This appears to only be a problem if using multiple camel contexts and
> setting allowBeanDefinitionOverriding to false. If you need to enforce the
> unique bean ids, I suspect a workaround is to define a template with a unique
> id for each camelContext in the XML, but then you lose the helpful benefit of
> not having to define that for every context.
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