Question

I have an interface its 2 implementation. I annotate both implementations by @Component. How can I specific one of them to be the default bean when will be used to inject by @Autowired as default.

Thanks

Answer 1

Use @Primary annotation on the bean which you think given higher priority.

from doc

Indicates that a bean should be given preference when multiple
candidates are qualified to autowire a single-valued dependency. If
exactly one ‘primary’ bean exists among the candidates, it will be the
autowired value.

May be used on any class directly or indirectly annotated with
Component or on methods annotated with Bean.

Using Primary at the class level has no effect unless
component-scanning is being used. If a Primary-annotated class is
declared via XML, Primary annotation metadata is ignored, and <bean
primary="true|false"/> is respected instead.