org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'g': Injectio

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log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'g': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Set wyj.ssh.entity.Grade.students; nested exception is org.springframework.beans.FatalBeanException: No element type declared for collection [java.util.Set]    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:326)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1204)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229)    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:725)    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)    at wyj.ssh.entity.test.add(test.java:20)    at wyj.ssh.entity.test.main(test.java:13)Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Set wyj.ssh.entity.Grade.students; nested exception is org.springframework.beans.FatalBeanException: No element type declared for collection [java.util.Set]    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:542)    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:323)    ... 14 moreCaused by: org.springframework.beans.FatalBeanException: No element type declared for collection [java.util.Set]    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:952)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:904)    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:514)    ... 16 more

用注解配置spring时候
@autowired注解属性都需要被设置，当spring找不到匹配的bean时候就会抛出异常
若允许不被设置；可以这样设置
@autowired(required=false)

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