Question

我正在Spring中测试简单的AOP用例，但出现以下错误，

线程“主”中的异常 org.springframework.beans.factory.NoSuchBeanDefinitionException：否定义了名为“ bean1”的bean

下面是我的源文件，

DemoConfig.java

package com.luv2code.aopdemo;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

import com.luv2code.aopdemo.aspect.MyDemoLoggingAspect;
import com.luv2code.aopdemo.dao.AccountDAO;

@Configuration
@EnableAspectJAutoProxy
@ComponentScan("com.luv2code.aopdemo")
public class DemoConfig {

    @Bean
    @Qualifier("bean1")
    public AccountDAO accDao() {
        return new AccountDAO();
    }

    @Bean
    @Qualifier("bean2")
    public MyDemoLoggingAspect myAscpect() {
        return new MyDemoLoggingAspect();
    }
}

MyDemoLoggingAspect.java

 package com.luv2code.aopdemo.aspect;

 import org.aspectj.lang.annotation.Aspect;
 import org.aspectj.lang.annotation.Before;

 @Aspect
 public class MyDemoLoggingAspect {

    // this is where we add all of our related advices for logging  
    // let's start with an @Before advice
    @Before("execution(** com.luv2code.aopdemo.dao.AccountDAO.addAccount(..))")
    public void beforeAddAccountAdvice() {  
        System.out.println("\n=====>>> Executing @Before advice on addAccount()");

    }
 }

MainDemoApp.java

package com.luv2code.aopdemo;

import com.luv2code.aopdemo.dao.AccountDAO;

public class MainDemoApp {

    public static void main(String[] args) {
        // read spring config java class
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DemoConfig.class);          
        // get the bean from spring container
        AccountDAO theAccountDAO = context.getBean("bean1", AccountDAO.class);
        // call the business method
        theAccountDAO.addAccount();
        // do it again!
        System.out.println("\nlet's call it again!\n");
        // call the business method again
        theAccountDAO.addAccount();     
        // close the context
        context.close();
    }
}

即使在Spring无法在上下文中找到我的bean之后，我也给了我自己的bean ID“ bean1”。为什么我会收到此错误以及如何解决此错误？

Answer 1

@Qualifier标记与@Autowired注释一起使用。

您需要的是

@Bean(name="bean1")
public AccountDAO accDao() {
    return new AccountDAO();
}

没有定义名为“”的bean

1 个答案: