dummy spring bean, 可用作任意bean的占位符

NullFactoryBean.java

package test;

import org.springframework.beans.factory.FactoryBean;

public class NullFactoryBean implements FactoryBean {

    public Void getObject() throws Exception {
        return null;
    }

    public Class<? extends Void> getObjectType() {
        return null;
    }

    public boolean isSingleton() {
        return true;
    }
}