春天：如何从依赖注入中隐藏bean？

Question

The situation is that I have two different resource bundles, a general one and a more specific one. They don't share any message keys.

General one:

<bean id="messageSourceGlobal" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="messages/messagesGlobal" />
</bean>

I include the general one in my specific one (different file obviously):

<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="messages/messages" />
    <property name="parentMessageSource" ref="messageSourceGlobal" />
</bean>

The Java-code then autowires it:

@Autowired
private MessageSource messages;

This will cause an exception when starting the web-app as two MessageSource s are found. Obviously I can use a @Qualifier to make it clear to Spring what I want. However, the general resource bundle won't be used alone. Therefore, I thought that in this case it would make sense to hide the general resource bundle from dependency injection. One benefit would be that others won't run into the "duplicates".

Is this possible? How would I do this?

Answer 1

确保可以在要隐藏的bean的定义上添加autowire-candidate="false" 。

Answer 2

在许多情况下，最好是使用primary =“ true”或@Primary升级一个bean，而不是使用autowire-candidate =“ false”降级所有其他候选对象 。