请教关于泛型自动装配的问题，@Autowired失败，s1和s2都是null，报错说循依赖（Circular reference ）

老师

你好，我按照你的代码测试StoreConfig类，但是无法Autowired s1和s2，报错信息如下：

我的Spring版本是4.1.4。请帮忙看一下，谢谢。

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.springtest.beanannotation.store.Store com.springtest.beanannotation.store.StoreConfig.s1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stringStoreTest' defined in com.springtest.beanannotation.store.StoreConfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.springtest.beanannotation.store.Store]: Circular reference involving containing bean 'storeConfig' - consider declaring the factory method as static for independence from its containing instance. Factory method 'stringStoreTest' threw exception; nested exception is java.lang.NullPointerException

各个类的代码如下：

//Interface Store<T>
package com.springtest.beanannotation.store;
public interface Store<T> {

}

//IntegerStore
package com.springtest.beanannotation.store;
public class IntegerStore implements Store<Integer> {

}

//StringStore 
package com.springtest.beanannotation.store;
public class StringStore implements Store<String> {
	public void init(){
		System.out.println("This is Init.");
	}
	
	public void destroy(){
		System.out.println("This is Destroy.");
	}
}

//StoreConfig 
@Configuration
@ImportResource("classpath:config.xml")
public class StoreConfig {
	
	@Autowired
	private Store<String> s1;
	
	@Autowired
	private Store<Integer> s2;
	
	@Bean
	public StringStore stringStore(){
		return new StringStore();
	}
	
	@Bean
	public IntegerStore integerStore(){
		return new IntegerStore();
	}
	
	@Bean(name="stringStoreTest")
	public Store stringStoreTest(){
		System.out.println("s1:"+s1.getClass().getName());
		System.out.println("s2:"+s2.getClass().getName());
		return new StringStore();
	}
	
}

//TestStore 
public class TestStore extends UnitTestBase {
	public TestStore(){
		super("classpath*:spring-beanannotation.xml");
	}
	
	@Test
	public void testG(){
		StringStore store = super.getBean("stringStoreTest");
	}
}

//配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd" >
        
        <context:component-scan base-package="com.springtest.beanannotation"></context:component-scan>
        
 </beans>