Historically, @Configuration classes that did not declare @Bean
methods were allowed to be abstract. However, the changes made in
76a6b9ea79 introduced a regression that prevents such classes from
being abstract, resulting in a BeanInstantiationException. This change
in behavior is caused by the fact that such a @Configuration class is
no longer replaced by a concrete subclass created dynamically by CGLIB.
This commit restores support for abstract @Configuration classes
without @Bean methods by modifying the "no enhancement required" check
in ConfigurationClassParser.
See gh-34486
Closes gh-34663
This commit removes the use of RepeatableContainers.of() in
AnnotationJmxAttributeSource since that is unnecessary when using the
MergedAnnotations API with @Repeatable annotations such as
@ManagedOperationParameter and @ManagedNotification.
Closes gh-34606
This commit introduces a new BeanRegistrar interface that can be
implemented to register beans programmatically in a concise and
flexible way.
Those bean registrar implementations are typically imported with
an `@Import` annotation on `@Configuration` classes.
See BeanRegistrarConfigurationTests for a concrete example.
See gh-18353
Prior to this commit, `SimpleKey` would be used in Spring Framework's
caching support and its `hashCode` value would be used to efficiently
store this key in data structures.
While the current hashcode strategy works, the resulting values don't
spread well enough when input keys are sequential (which is often the
case). This can have negative performance impacts, depending on the
data structures used by the cache implementation.
This commit improves the `hashCode` function with a mixer to better
spread the hash values. This is using the mixer function from the
MurMur3 hash algorithm.
Closes gh-34483
Prior to this commit, if a custom stereotype annotation was
meta-annotated with @Component and declared a local String `value`
attribute that was explicitly configured (via @AliasFor) as an
override for an attribute other than @Component.value, the local
`value` attribute was still used as a convention-based override for
@Component.value.
Consequently, a local `value` attribute was used as a custom
@Component name, even when that is clearly not the intent.
To address that, this commit revises the logic in
AnnotationBeanNameGenerator so that a `value` attribute which is
explicitly aliased to something other than @Component.value is no
longer used as an explicit @Component name.
See gh-34317
Closes gh-34346
