spring常见异常

 到目前为止最常见的导致BeanCreationException 莫过于注入一个上下文中不存在的bean。 
例如：BeanA尝试注入BeanB

@Component
public class BeanA {

    @Autowired
    private BeanB dependency;
    ...
}
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如果spring上下文中不存在BeanB，那么下面的异常将会抛出

Error creating bean with name 'beanA': Injection of autowired dependencies failed;

当你尝试让spring使用接口名来时创建一个bean时，但是发现它有两个或多个实现 
例如：BeanB1 和BeanB2都实现了同一个接口

@Component
public class BeanB1 implements IBeanB { ... }
@Component
public class BeanB2 implements IBeanB { ... }

@Component
public class BeanA {

    @Autowired
    private IBeanB dependency;
    ...
}
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这将导致BeanFactory抛出一下异常：

Error creating bean with name 'beanA': Injection of autowired dependencies failed; 

noMapping

Error creating bean with name 'beanA'..