用于覆盖 XML 定义的 Bean 注释 - Spring

Question

My spring-boot application has another library project included as a dependency. This library project has a spring.xml file where a number of beans defined. One of these beans has another external dependency injected which I don't need in my project. Hence this is throwing an error when I start my application. I want to define the same bean in my application as a java config and make spring-boot ignore the specific bean from spring.xml file. However I want all the other beans in spring.xml to be read.

Answer 1

Define a bean in your local java config with the same name and type as the one inherited in the spring.xml file.

Annotate your bean with @Primary which will make yours used over the imported one.

Your application will still use the definitions of all the other beans you inherit.

To prevent other defined beans loading that you do not actually need you have to change the bean creation to lazy configuration, that is, they only get created when explicitly used.

To do this in your main Spring boot class where the application is created, most likely annotated with @SpringBootApplication/ @Configuration/ @EnableAutoConfiguration/ @ComponentScan you should add @Lazy above it.

Usually you would explicitly annotate the Bean in question but here it cannot be done as it is originating in a spring.xml file in a 3rd party jar. The idea here is to cleanly state all beans are lazy from the highest point in the spring configuration.

Answer 2

It seems that you want to include spring.xml from other jar and exclude a bean in the xml. I don't know spring framework provides some way. I prefer to copy the spring.xml file to new project and remove the unnecessary bean.