JIRA: https://jira.spring.io/browse/INT-3701
Allow Spring Boot to determine type created by GatewayProxyFactoryBean
Spring Boot's @ConditionalOnBean can be used to activate some
configuration when a bean of a particular type is present in the
application context. To avoid early initialization, the search for
beans is performed without instantiating them, i.e. it relies on the
information that's available from the bean's class and its bean
definition. This causes a problem with GatewayProxyFactoryBean as its
a FactoryBean<Object> so Boot's best guess is that the bean that's
produced by the factory will be an Object. For cases where the bean's
type signiture does not contain enougn information to determine its
type, Boot looks at an attribute, factoryBeanObjectType, on the
factory bean's definition. The value of this attribute can be a Class
or a String class name.
This commit updates MessagingGatewayRegistrar to set the
value of factoryBeanObjectType attribute to be the configured
service interface for the gateway.
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