使用AnnotationConfigApplicationContext的NoSuchBeanDefinitionException異常

我得到「org.springframework.beans.factory.NoSuchBeanDefinitionException：沒有名爲'employee'的bean被定義」錯誤，我不確定我做錯了什麼。請在代碼下方找到。使用AnnotationConfigApplicationContext的NoSuchBeanDefinitionException異常

）的AppConfig類：

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

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

2）Employee類

@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）地址類別：

@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）麥類n級

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(); 
     } 

    } 

}

請幫我解決這個問題。

感謝，卡邁勒

來源

2017-02-09 Kamal Verma

您對豆類註冊的配置，例如使用您的組件封裝組件掃描。

有幾種方法你@Configuration

你也可以在你的@Configuration

添加 @Bean您 @Components做到這一點

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

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

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

如何更改代碼

1給你的類的包中（如果你沒有它的話）。我用過測試。組件，用於在變化的AppConfig
```
 @ComponentScan("com.spring.annotation.propertyconfigurer") 
```
與
```
@ComponentScan("test.component") 
```
或
```
@ComponentScan(basePackages={"test.component"}) 
```
3-在propertyConfigurerApp變化的僱員和地址

2-
```
  AbstractApplicationContext context = new AnnotationConfigApplicationContext("AppConfig.class") 
```
與
```
AbstractApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class) 
```
它應該工作（把你的employee.properties類路徑的根目錄）

但是你不需要做這一切componentscanning東西，你不使用自動裝配你的榜樣。

來源

2017-02-09 05:54:30 Massimo

@Massino我的AppCongif類已經有了ComponentScan。所以它應該工作。 –

另外，我使用@Component註冊了Employee和Address類的spring bean。但是它仍然不起作用 –

你沒有設置@ComponentScan（{package-where-your-components-are}）。你也不需要@ComponentScan（「com.spring.annotation.propertyconfigurer）豆 – Massimo

使用AnnotationConfigApplicationContext的NoSuchBeanDefinitionException異常

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