Introduce a pre-resolved target type in RootBeanDefinition [SPR-10335]

[spring-projects-issues]

Arjen Poutsma opened SPR-10335 and commented

It would be great if the RootBeanDefiniton would have a pre-resolved target type field, so that - if the target type is know beforehand - we do not have to resort to predicting it the various bean factories.

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Issue Links:

• Type detection fails for child bean if parent bean has been resolved before [SPR-10374] #15007 Type detection fails for child bean if parent bean has been resolved before
• Allow programmatic registration of bean definitions with a ResolvableType [SPR-14580] #19149 Allow programmatic registration of bean definitions with a ResolvableType

Referenced from: commits c986a1e

[spring-projects-issues]

Juergen Hoeller commented

RootBeanDefinition has a public "setTargetType" method now. Make sure to use a RootBeanDefinition over a GenericBeanDefinition for setting that type in advance.

We also cache the resolved target type per bean definition for regular bean classes and factory methods now, which should deliver a performance benefit for non-singleton bean creation - in particular for beans defined on a configuration class.

Juergen