Spring未在JavaConfig中拾取的Bean上的@PropertySource

Question

I've got 2 different maven projects: project A and project B, where A is a maven dependency of B. Project A has a class annotated with @PropertySource :

@Component
@PropertySource({"classpath:spring-files/resource.properties"})
public class BeanAImpl implements BeanA{

@Value("#{\'${list.of.some.properties}\'.split(\',\')}")
    private String someProperties;
}

In project B, I want to be able to define BeanAImpl. So I define it in my JavaConfig class of project B:

@Configuration
public class ProjectBConfig{

@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
    return new PropertySourcesPlaceholderConfigurer();
}
@Bean
public BeanA beanA() {
    return new BeanAImpl();
}

I get a BeanCreationException, since the injection of the List into "someProperties" has failed. If I add to my @Configuration class (in project B) a component scan annotation for BeanAImpl's package, then the context will load successfully. Also, if I add the @PropertySource declaration to the config class - then it's going to work. But it seems that simply defining beanA in the configuration, does not take into account its annotations. I also tried changing beanA from @Component to @Configuration , which did not help.

Is there a way for me to have BeanAImpl inject the value from the properties by simply defining it as a bean, without needing to add extra configuration? Why is this happening?

Answer 1

@PropertySource annotation should be on class annotated with @Configuration , something similar to this:

@Configuration
@PropertySource({"classpath:spring-files/resource.properties"})
public class ProjectBConfig{

Or you can create separate configuration class in project A.

See javadoc for details of @PropertySource annotation.