Strange exception on injection of primitive via Spring @Value annotation

Question

I have strange error on attempt to inject int primitive via Spring @Value annotation (Spring version 3.2.13). Short description: Spring is trying to inject bean of primitive type (int in my case) instead of primitive itself.

• I have property file "myProps.properties" with property

  number.of.search.log.events.in.queue=4
  

• Configuration class on scanned path with content

  @Configuration
  @ComponentScan(basePackages = {
          "com.search.log"
  })
  @PropertySource("classpath:myProps.properties")
  @EnableAspectJAutoProxy
  public class SearchLogConfiguration {
  
      @Bean
      public static PropertySourcesPlaceholderConfigurer  propertySourcesPlaceholderConfigurer() {
          return new PropertySourcesPlaceholderConfigurer();
      }
  
  }
  

• Aspect where primitive should be injected

  @Aspect
  @Component
  public class SearchLogAspectHandler {
  
      @Value("${number.of.search.log.events.in.queue:2}")
      public int numberOfSearchLogEventsInQueue;
  ...
  }
  

Every time on application start I got this exception:

Injection of autowired dependencies failed; nested exception is   org.springframework.beans.factory.BeanCreationException: Could not autowire field: public int numberOfSearchLogEventsInQueue; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [int] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Value(value=${number.of.search.log.events.in.queue})}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:298)

Also primitives can't be injected into other beans as well.

Question: Please, help to find out why Spring can't inject primitive, but instead is trying to inject bean of type [int] and can't found one.

Answer 1

Change @PropertySource("classpath:applicationConfig.properties") into @PropertySource("classpath:myProps.properties") or use @PropertySources annotation.