spring中sayBeforeAdvice (wrong name: SayBeforeAdvice)

错误提示，如下：

log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [sayBeforeAdvice] for bean with name 'sba' defined in class path resource [applicationContext.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: sayBeforeAdvice (wrong name: SayBeforeAdvice)
Caused by: java.lang.NoClassDefFoundError: sayBeforeAdvice (wrong name: SayBeforeAdvice)
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClass(Unknown Source)
 at java.security.SecureClassLoader.defineClass(Unknown Source)
 at java.net.URLClassLoader.defineClass(Unknown Source)
 at java.net.URLClassLoader.access$100(Unknown Source)
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at org.springframework.util.ClassUtils.forName(ClassUtils.java:229)
 at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:327)
 at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1073)
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:283)
 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
 at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:122)
 at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:66)
 at test.main(test.java:13)

仔细检查，发现在配置文件中的<bean id="sba" class="sayBeforeAdvice"/>语句中，sayBeforeAdvice应该写成和类名一致，即SayBeforeAdvice。