Autowiring in Spring with annotations

Question

In my simple Spring project I have a class-bean named Property :

@Component
public class Property implements DisposableBean,InitializingBean{

    private int square_area;
    private int floor_count;

    @Autowired
    @Qualifier("myLocation")
    private Location location;

    public Property() {
        super();
    }

    @Bean
    @Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
    public Property prop(){
        return new Property(100,3);
    }

    public Property(int square_area, int floor_count, Location location) {
        this.square_area = square_area;
        this.floor_count = floor_count;
        this.location = location;
    }

    public Property(int square_area, int floor_count) {
        this.square_area = square_area;
        this.floor_count = floor_count;
        this.location = location;
    }


    public void afterPropertiesSet() throws Exception {
        // TODO Auto-generated method stub

    }

    public void destroy() throws Exception {
        // TODO Auto-generated method stub

    }

    public int getSquare_area() {
        return square_area;
    }

    public void setSquare_area(int square_area) {
        this.square_area = square_area;
    }

    public int getFloor_count() {
        return floor_count;
    }

    public void setFloor_count(int floor_count) {
        this.floor_count = floor_count;
    }


    public Location getLocation() {
        return location;
    }


    public void setLocation(Location location) {
        this.location = location;
    }

    @Override
    public String toString() {
        return "Property [square_area=" + square_area + ", floor_count=" + floor_count + ", location=" + location + "]";
    }

    public void gettingDusty(){
        System.out.println("Im getting dusty | " + this);
    }

}

and I'm trying to autowire field "location". Location class looks like this :

@Component
public class Location {

    private String country;
    private String region;
    private String settlement;
    private String street;
    private int house;

    @Bean("myLocation")
    @Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
    public Location myLocation(){
        return new Location("US","California","Some peacefull town","Some peacefull street",1);
    }

    public Location(String country, String region, String settlement, String street, int house) {
        super();
        this.country = country;
        this.region = region;
        this.settlement = settlement;
        this.street = street;
        this.house = house;
    }

    @Override
    public String toString() {
        return "Location [country=" + country + ", region=" + region + ", settlement=" + settlement + ", street="
                + street + ", house=" + house + "]";
    }
}

And I'm getting org.springframework.beans.factory.UnsatisfiedDependencyException :

Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'property': Unsatisfied dependency expressed through field 'location'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'location' defined in file [C:\Users\TheDanileron\spring_tests\spring_test4\target\classes\spring_tests\spring_test3\Location.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.String' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:581)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:367)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1340)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1249)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1098)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:330)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1083)
    at spring_tests.spring_test3.App.main(App.java:25)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'location' defined in file [C:\Users\TheDanileron\spring_tests\spring_test4\target\classes\spring_tests\spring_test3\Location.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.String' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:723)
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:192)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1269)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1126)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1133)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1060)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:578)
    ... 18 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.String' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1501)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1099)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1060)
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:809)
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:715)
    ... 31 more

How can I autowire field "location" with a bean created by myLocation method in Location.class ?

Answer 1

You have a @Component annotation on Location so Spring tries to create it as a bean using the constructor which requires parameters. Your application context does not provide these parameters therefore bean creation fails.

It seems you just want to configure an instance of Location programmaticaly. Then remove @Component from Location and create a separate configuration class like LocationConfiguration :

@Configuration
public class LocationConfiguration {

    @Bean
    @Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
    public Location myLocation(){
        return new Location("US","California","Some peacefull town","Some peacefull street",1);
    }
}