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Document @Bean definitions via default methods #767

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Document @Bean definitions via default methods #767

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19 changes: 19 additions & 0 deletions src/asciidoc/core-beans.adoc
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Expand Up @@ -5922,6 +5922,25 @@ Both declarations make a bean named `transferService` available in the
transferService -> com.acme.TransferServiceImpl
----

You can also use Java 8 default methods to define beans. This allows composition
of bean configurations by implementing interfaces with bean definitions on default methods.

[source,java,indent=0]
[subs="verbatim,quotes"]
----
public interface FooConfig {
@Bean
default Foo foo() {
Foo foo = new Foo();
foo.init();
return foo;
}
}

@Configuration
public class AppConfig implements FooConfig {
}
----

[[beans-java-dependencies]]
==== Bean dependencies
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