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Is it possible to set the property of one bean by reading the property of another bean? For instance, suppose I had:
class A { void setList(List list); } class B { List getList(); } I would like Spring to instantiate both classes, and call A's setList method, passing in the result of calling B's getList method. The Spring configuration might look something like:
<bean id="b" class="B"/> <bean id"a" class="A"> <property name="list" ref="b" ref-property="list"/> </bean> Alas, this made-up XML does not work.
Why not just inject B into A? Because I do not want to introduce the extra dependency. A is only dependent List, not on B.
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Annotating a class with the @Configuration indicates that the class can be used by the Spring IoC container as a source of bean definitions. The @Bean annotation tells Spring that a method annotated with @Bean will return an object that should be registered as a bean in the Spring application context.
Property values can be injected directly into your beans by using the @Value annotation, accessed through Spring's Environment abstraction, or be bound to structured objects through @ConfigurationProperties .
Spring @Bean Annotation is applied on a method to specify that it returns a bean to be managed by Spring context. Spring Bean annotation is usually declared in Configuration classes methods. In this case, bean methods may reference other @Bean methods in the same class by calling them directly.
in addition to @Kevin's answer if you are using spring 3.0 it is possible to do this with the new spring expression language
<bean id="a" class="A"> <property name="list" value="#{b.list}"/> </bean> spring 3.0 documentation
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