使用AnnotationConfigApplicationContext的NoSuchBeanDefinitionException异常

我得到“org.springframework.beans.factory.NoSuchBeanDefinitionException：没有名为'employee'的bean被定义”错误，我不确定我做错了什么。请在代码下方找到。使用AnnotationConfigApplicationContext的NoSuchBeanDefinitionException异常

）的AppConfig类：

@ComponentScan("com.spring.annotation.propertyconfigurer") 
@Configuration 
@PropertySource("classpath:employee.properties") 
public class AppConfig { 

@Bean 
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() { 
    return new PropertySourcesPlaceholderConfigurer(); 
}  
}

2）Employee类

@Component("employee") 
public class Employee { 

    @Value("${emp.empId}") 
    private int empId; 
    @Value("${emp.name}") 
    private String name; 
    @Autowired 
    private Address address; 

    public int getEmpId() { 
     return empId; 
    } 

    public void setEmpId(int empId) { 
     this.empId = empId; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public Address getAddress() { 
     return address; 
    } 

    public void setAddress(Address address) { 
     this.address = address; 
    } 

    public void print() { 
     System.out.println("Employee Id -> " + empId); 
     System.out.println("Employee Name -> " + name); 
     System.out.println("Employee Address -> [ " + address.getCity() + "," + getAddress().getCountry() + "]"); 
    } 
}

3）地址类别：

@Component("address") 
public class Address { 

    private String city; 
    private String country; 

    public String getCity() { 
     return city; 
    } 

    public void setCity(String city) { 
     this.city = city; 
    } 

    public String getCountry() { 
     return country; 
    } 

    public void setCountry(String country) { 
     this.country = country; 
    } 
}

4）麦类n级

public class PropertyConfigurerApp { 

    public static void main(String[] args) { 
     try (AbstractApplicationContext context = new AnnotationConfigApplicationContext("AppConfig.class")) { 
      Employee employee = (Employee) context.getBean("employee"); 
      employee.print(); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

    } 

}

请帮我解决这个问题。

感谢，卡迈勒

来源

2017-02-09 Kamal Verma

您对豆类注册的配置，例如使用您的组件封装组件扫描。

有几种方法你@Configuration

你也可以在你的@Configuration

添加 @Bean您 @Components做到这一点

@ComponentScan({package1, .., package n})

<context:component-scan base-package="org.example"/>
查看春季文档

http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle

http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#beans-annotation-config

如何更改代码

1给你的类的包中（如果你没有它的话）。我用过测试。组件，用于在变化的AppConfig
```
 @ComponentScan("com.spring.annotation.propertyconfigurer") 
```
与
```
@ComponentScan("test.component") 
```
或
```
@ComponentScan(basePackages={"test.component"}) 
```
3-在propertyConfigurerApp变化的雇员和地址

2-
```
  AbstractApplicationContext context = new AnnotationConfigApplicationContext("AppConfig.class") 
```
与
```
AbstractApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class) 
```
它应该工作（把你的employee.properties类路径的根目录）

但是你不需要做这一切componentscanning东西，你不使用自动装配你的榜样。

来源

2017-02-09 05:54:30 Massimo

@Massino我的AppCongif类已经有了ComponentScan。所以它应该工作。 –

另外，我使用@Component注册了Employee和Address类的spring bean。但是它仍然不起作用 –

你没有设置@ComponentScan（{package-where-your-components-are}）。你也不需要@ComponentScan（“com.spring.annotation.propertyconfigurer）豆 – Massimo

使用AnnotationConfigApplicationContext的NoSuchBeanDefinitionException异常

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