Unsatisfied dependency expressed through field on factory-bean - spring

Question

I am getting the following error :
Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'factoryBO': Unsatisfied dependency expressed through field 'cleanupProvider': No qualifying bean of type [com.spring.factory.interfaces.impl.CleanupProvider] found for dependency [com.spring.factory.interfaces.impl.CleanupProvider]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.spring.factory.interfaces.impl.CleanupProvider] found for dependency [com.spring.factory.interfaces.impl.CleanupProvider]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:350)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:775)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.spring.factory.runner.FactoryRunner.main(FactoryRunner.java:10)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.spring.factory.interfaces.impl.CleanupProvider] found for dependency [com.spring.factory.interfaces.impl.CleanupProvider]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1398)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1051)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1018)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:570)
... 15 more
Source code :
FactoryBo.java
I added #Autowired on top od CleanupProvider class; I did it for corresponding interface as well; But it didn't work for me;
package com.spring.factory.bo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.spring.factory.interfaces.ICleanupProvider;
import com.spring.factory.interfaces.impl.CleanupProvider;
#Component
public class FactoryBO {
#Autowired
CleanupProvider cleanupProvider;
public void getFactoryProviderLogic() {
cleanupProvider.performCleanup("Algo");
}
}
CleanupProvider.java
package com.spring.factory.interfaces.impl;
import com.spring.factory.interfaces.ICleanupProvider;
import com.spring.factory.interfaces.ICleanupStrategy;
public class CleanupProvider implements ICleanupProvider {
#Override
public String performCleanup(String strate) {
System.out.println("Received Text:::"+ strate);
return strate+":"+"Received";
}
#Override
public void registerStrategy(ICleanupStrategy normalizeStrategy) {
System.out.println("NormalizationProvider:::registerStrategy::");
}
}
CleanupProviderFactory .java
So, here I want to make the existing method createInstance as a factory method;
package com.spring.factory.interfaces.impl;
import com.spring.factory.interfaces.ICleanupProvider;
import com.spring.factory.interfaces.ICleanupProviderFactory;
public class CleanupProviderFactory implements ICleanupProviderFactory {
public ICleanupProvider createInstance() {
ICleanupProvider normalizeProvider = new CleanupProvider();
normalizeProvider.registerStrategy(new CleanupStrategy());
return normalizeProvider;
}
public static ICleanupProviderFactory createFactoryInstance() {
return new CleanupProviderFactory();
}
}
ICleanupProvider.java
package com.spring.factory.interfaces;
public interface ICleanupProvider {
public String performCleanup(String algo);
public void registerStrategy(ICleanupStrategy strategy);
}
ICleanupProviderFactory.java
package com.spring.factory.interfaces;
public interface ICleanupProviderFactory {
}
package com.spring.factory.runner;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.spring.factory.bo.FactoryBO;
public class FactoryRunner {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
FactoryBO bo = context.getBean(FactoryBO.class);
bo.getFactoryProviderLogic();
context.close();
}
}
spring.xml
<context:annotation-config/>
<context:component-scan base-package="com.spring.factory.bo"></context:component-scan>
<bean id="cleanupProviderFactory"
class="com.spring.factory.interfaces.impl.CleanupProviderFactory"
factory-method="createFactoryInstance"></bean>
<bean id="cleanupProvider"
class="com.spring.factory.interfaces.ICleanupProvider"
factory-bean="cleanupProviderFactory" lazy-init="default" factory-method="createInstance"></bean>
Is there anything I missed?

Answer 1

You can add #Component to your CleanupProvider class:
#Component
public class CleanupProvider { ...}
Or define a method to create your been like so:
#Bean
public CleanupProvider getCleanupProvider() {
return new CleanupProvider();
}
An explanation of which annotation to use is best described here: Understanding Spring #Autowired usage

Answer 2

I believe you just missed providing your CleanupProvider class a #Bean annotation (like #Component, #Service, #Repository, #Controller) so that bean factory recognizes it and is able to Autowire, like this Spring documentation tells you to do so.
EDIT
Ok, so have seen your spring.xml, I assume the mistake was you were declaring the bean as ICleanupProvider class, which is the interface, whereas FactoryBO autowires the implementation (CleanupProvider).