关于jpa dao接口的自动实现

[wangpengxiqian]

最近在搞struts，spring，jpa的整合，感觉jpa dao 接口的自动实现用起来很方便，但是有一点疑问的地方；
dao接口的定义说是要这样

public interface UserDao extends JpaRepository<Persion, Integer> {
}

那岂不是要给每个实体都定一个这样的接口？感觉这样就不是很方便了，于是突发奇想，是不是可以这样定：

public interface  MyDao<T,ID extends Serializable> extends JpaRepository<T,ID> {

}

这样一来我只需要在注入MyDao的时候再指明实体类就好了，可是竟然在启动的时候报错，错误信息如下：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myDao': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:149)
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:102)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1442)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:305)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:442)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:416)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:550)
	at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:155)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:92)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:303)
	... 28 more
Caused by: java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
	at org.hibernate.ejb.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:200)
	at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:61)
	at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getMetadata(JpaEntityInformationSupport.java:65)
	at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:146)
	at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:84)
	at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:67)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:136)
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:153)
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:43)
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)
	... 38 more

不知道有没有好的解决方法？求赐教

[zb402230366]

同求啊，这是什么问题啊

[zb402230366]

同求啊，这是什么问题

[湛卢VV]

既然有工厂 为什么不在工厂里调用dao的 继承实例呢？

[猫大叔]

因为Dao在容器启动时就会加载的。

[放纵的青春]

你可以这样 定义一个baseDao接口 继承JpaRepository 然后以后创建的接口继承baseDao就行了

[shmilyxiaolong]

你好，我现在的用法和你一样，同时是出现这个问题，请问你解决了没有呢，能告诉我解决的方法吗？

[阿狸_A_桃子]

你的实体类没有加注解。 @Entity @Table(name = "ti_bss2etos_inf_log") public class Bss2etosInfLog implements Serializable{ @Id @Column(name = "STREAMING_NO", unique = true, nullable = false, length = 36) public String getStreamingNo() { return streamingNo; } public void setStreamingNo(String streamingNo) { this.streamingNo = streamingNo; } @Column(name = "OP_FLAG", nullable = false, length = 32) public String getOpFlag() { return opFlag; } public void setOpFlag(String opFlag) { this.opFlag = opFlag; } }

[qiuqiupeng]

@NoRepositoryBean public interface BaseRepository<T, ID extends Serializable> extends JpaRepository<T, ID>, JpaSpecificationExecutor<T> { }

[hfzlmx]

http://blog.csdn.net/yyzhq/article/details/8006923