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I have a large spring applications using annotations that works fine in spring 4.3.13, and am looking to update to spring 5. I am getting all kinds of failures wiring beans, which look like the typical:
Unsatisfied dependency expressed through field 'pcoDAO'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.acme.dao.impl.contracts.PotentialChangeOrderDAO' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
turning on spring debug logging, only nets this additional line
Failed to meta-introspect annotation interface org.springframework.beans.factory.annotation.Autowired: java.lang.NullPointerException
It's not like all @Autowired fields fail, just this one (so far). The bean is specified by an interface, and the implementation is in a sub package of the interface, but again this worked before. The interface's package is specified directly in the context:component-scan base-package="com.acme.package.of.interface"
Again this works fine in 4.3.13, and the only change is spring being upgraded to 5.0.5-RELEASE.
Are they any known changes to how spring finds beans? or any documentation about this?
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Spring Boot 2.7. 5 requires Java 8 and is compatible up to and including Java 19. Spring Framework 5.3. 23 or above is also required.
@Component is a class-level annotation, but @Bean is at the method level, so @Component is only an option when a class's source code is editable. @Bean can always be used, but it's more verbose. @Component is compatible with Spring's auto-detection, but @Bean requires manual class instantiation.
If you define two beans of same class, without different bean id or qualifiers ( identifier) , Spring container will not be able to understand which bean to be loaded , if you try to access the bean by passing the classname and you will get NoUniqueBeanDefinitionException as there are two qualifying TestBean.
@Bean is a method-level annotation and a direct analog of the XML <bean/> element. The annotation supports most of the attributes offered by <bean/> , such as: init-method , destroy-method , autowiring , lazy-init , dependency-check , depends-on and scope .
Seems a bug of Spring 5.0.5, and has been fixed in 5.0.6, see this Null check needed in AnnotationUtils.getAnnotation
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