Spring 常见错误

1.getBean的class类放错了

org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 
'accountDao2' is expected to be of type 'com.zhw.dao.impl.AccountDaoImpl2' 
but was actually of type 'com.sun.proxy.$Proxy14'

如果改成它的接口就不会报错了

 

2.忘记加AspectJ包了

警告: Exception encountered during context initialization - cancelling refresh 
attempt: org.springframework.beans.factory.BeanCreationException: Error creating 
bean with name 'org.springframework.context.event.internalEventListenerProcessor': BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0': 
Cannot resolve reference to bean 'serviceOperation' while setting bean property 
'pointcut'; nested exception is org.springframework.beans.factory.
BeanCreationException: Error creating bean with name 'serviceOperation': 
Failed to introspect bean class [org.springframework.aop.aspectj.
AspectJExpressionPointcut] for lookup method metadata: could not find class 
that it depends on; nested exception is java.lang.NoClassDefFoundError:
org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException

上面一大段不要被它吓到了，直接看最后两行就好了

that it depends on; nested exception is java.lang.NoClassDefFoundError:
org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException

没有找到包!

3.没有打开mysql服务了

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver
 has not received any packets from the server.

打开mysql服务

再次运行