Add FactoryBean.OBJECT_TYPE_ATTRIBUTE to registered beans

[philwebb]

See spring-projects/spring-boot#21379 for more background.

It would be helpful if FeignClientsRegistrar could add a FactoryBean.OBJECT_TYPE_ATTRIBUTE attribute to the registered bean definition. The value of the attribute should be the type of bean that the FeignClientFactoryBean will ultimately create.

With such an attribute in place, it will be possible for Spring Boot's @MockBean support to tell the type without needing to instantiate the factory bean.

[spencergibb]

@philwebb something like this?

beanDefinitionBuilder.addPropertyValue(FactoryBean.OBJECT_TYPE_ATTRIBUTE, className);

[spencergibb]

@MPoorter I'm unable to recreate the issue to validate a fix. I've copied code from #336 (comment) but the mock bean works without errors.

[philwebb]

@spencergibb It needs to be added to the attributes. Something more like this:

beanDefinitionBuilder.getBeanDefinition()
    .setAttribute(FactoryBean.OBJECT_TYPE_ATTRIBUTE, className);

[spencergibb]

ah, I figured I was missing something. Thanks @philwebb