基于xml配置reference bean存在ReferenceBean提前初始化的问题,导致xml配置的占位符无法被替换

[mooseen]

使用dubbo spring boot发现，当引入xml配置时,由于xml的reference会在beanFactoryPostProcessor阶段解析生成ReferenceBean的BeanDefinition,随后当调用getBeanNamesForType方法时
DubboConfigBeanDefinitionConflictProcessor#resolveUniqueApplicationConfigBean)
会触发遍历所有的BeanNames,并执行isTypeMatch方法，在执行isTypeMatch方法时第一步会通过newInstance方式生成ReferenceBean（getSingletonFactoryBeanForTypeCheck方法），但是newInstance方式getObjectType会返回null,之后会触发ReferenceBean提前初始化(getTypeForFactoryBean方法). 当ReferenceBean初始化完成后执行afterPropertiesSet方法，在afterPropertiesSet又会提前初始化RegistryConfig等Bean(BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext,RegistryConfig.class)),但是由于RegistryConfig等Bean是在BeanPostProcessor阶段(非BeanFactoryPostProcessor阶段)进行赋值以及参数宏替换，因此拿到的RegistryConfig要么为空(properties方式声明)，要么占位符没有替换(xml方式声明)，随后直接导致ReferenceBean初始化失败.

Caused by: java.lang.IllegalStateException: No registry config found or it's not a valid config! The registry config is: <dubbo:registry valid="false" zookeeperProtocol="false" prefix="dubbo.registry" />
	at org.apache.dubbo.config.AbstractInterfaceConfig.checkRegistry(AbstractInterfaceConfig.java:202) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:378) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:329) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:250) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.init(ReferenceAnnotationBeanPostProcessor.java:269) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.access$100(ReferenceAnnotationBeanPostProcessor.java:242) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.buildInvocationHandler(ReferenceAnnotationBeanPostProcessor.java:236) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.buildProxy(ReferenceAnnotationBeanPostProcessor.java:219) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:134) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.getInjectedObject(AnnotationInjectedBeanPostProcessor.java:360) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor$AnnotatedFieldElement.inject(AnnotationInjectedBeanPostProcessor.java:540) ~[dubbo-2.7.3.jar:2.7.3]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.postProcessPropertyValues(AnnotationInjectedBeanPostProcessor.java:147) ~[dubbo-2.7.3.jar:2.7.3]
	... 17 more

[mercyblitz]

DubboConfigBeanDefinitionConflictProcessor will be deprecated, this issue will be resolved since 2.7.5

[mooseen]

I found this issue has not been completely solved in version 2.7.5. The eager initialization has bean solved in this version , but placeholder is not going to work in xml. #646

[shuangbofu]

你好，我也碰上类似的情况了，但是基本同样的配置两个项目，一个正常一个出现这个问题。请问你有解决这个问题吗？