Spring数据:不是托管类型:类java.lang.Object [英] Spring Data: Not an managed type: class java.lang.Object
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问题描述
我正在尝试通过遵循不同的Spring教程通过Spring Boot公开我的数据库表，并且遇到了以下异常(我将在末尾发布异常).
I am trying to expose my db tables via spring boot by following different spring tutorials and I am running into following exception (I will post exception at the end).
这是我正在使用的课程
package com.xxx.xxx.db;
import org.springframework.data.repository.Repository;
import java.io.Serializable;
public interface BaseRepository<T, ID extends Serializable> extends Repository<T, ID>{
T findOne(ID id);
T save(T entity);
}
这是我的特定服务类别
package com.xxx.xxx.tablename;
import com.xxx.xxx.db.BaseRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class TableNameService {
@Autowired
private BaseRepository<TableName, Long> repository;
public TableName findById(Long id){
return repository.findOne(id);
}
}
这是我的实体
package com.xxx.xxx.tablename;
import lombok.Getter;
import lombok.Setter;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
@Getter
@Setter
@Entity
@Table(name="table_name")
public class TableName {
@Id
private long id;
@NotNull
private String name;
public TableName() {
}
public TableName(long id){
this.id = id;
}
public TableName(String name){
this.name = name;
}
public TableName(long id, String name){
this.id = id;
this.name = name;
}
}
我的弹簧配置由application.yml文件完成.该文件目前只有database个连接信息，仅此而已
My spring configurations are being done by application.yml file. The file currently have only database connection informaiton and nothing more than that
我还有一个名为BeansConfig的类，该类由@Configuration注释.但是，该类用于验证application.yml提供的db属性是否有效.
I also have a class named BeansConfig which is annotated by @Configuration. But this class is being used to validate if db properties which are being provided by application.yml are valid.
现在这是个例外
springframework.beans.factory.BeanCreationException: Error creating bean with name 'TableNameService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.xxx.xxx.db.BaseRepository com.xxx.xxx.tablename.TableNameService.repository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'baseRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766)
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180)
at com.xxx.xxx.Application.main(Application.java:12)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.xxx.xxx.db.BaseRepository com.xxx.xxx.tablename.TableNameService.repository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'baseRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
... 17 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'baseRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545)
... 19 common frames omitted
Caused by: java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
at org.hibernate.jpa.internal.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:219)
at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:68)
at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:67)
at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:152)
at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:99)
at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:81)
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:185)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:251)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:237)
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:92)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
... 29 common frames omitted
推荐答案
这不是您尝试的方式.由于T必须是 Entity ，您需要对其进行类型限制.一种选择是为每个具体实体建立一个存储库，但是在这里，您有一种更通用的实现方式:
That's not possible the way you are trying. Since T needs to be an Entity, you need to type-restrict it. One option would be to make one repository per concrete Entity, but here you have a more generic way of implementing it:
为您的实体使用BaseClass:
Use a BaseClass for your entities:
@Entity
public abstract class BaseClass<IdType extends Serializable>{
private IdType id;
//Getter and setters
}
定义 @Repository 用于您的基类:
Define a @Repository for your base class:
@Repository
public interface Dao<T extends BaseClass, IdType extends Serializable> extends
CrudRepository<T, IdType> {
}
您可以在此接口中定义共享实体操作，并在需要时从它们继承以获取更具体的操作.
You can define the shared entity operations in this interface and inherit from them for more concrete ones in the cases demanding it.
另请参见:
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