使用接口和 Long 实现 CrudeRepository答案

【问题标题】：Implementing CrudeRepository with an interface and Long使用接口和 Long 实现 CrudeRepository
【发布时间】：2021-03-10 12:49:03
【问题描述】：

我正在尝试实现一个通用的原始存储库，但 Spring Boot 给出了一个“非托管类型”异常 - 在我正在参数化我的 CrudeRepository 的那个接口 (IStorable) 上。如果这里有人可以帮助我，我将不胜感激。谢谢！

我有我的回购：

 package com.project.biddingSoft.dao;
    public interface IRepo extends CrudRepository<IStorable, Long> {
    }

然后我有我的界面：

  package com.project.biddingSoft.model;
    public interface IStorable {
        public Long getId() ;
    }

之后我有了我的实体类：

   package com.project.biddingSoft.model;
    @Entity
    public class Lot implements IStorable {

    @Override
    public Long getId() {
        return id;
    }
    
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private  Long id;

    setters, getters and attributes as usual..
    
    }

这是主类：

   package com.project.biddingSoft;
    @SpringBootApplication(exclude = {SecurityAutoConfiguration.class })
    public class BiddingSoftwareApplication implements CommandLineRunner {
        public static void main(String[] args) {
            SpringApplication.run(BiddingSoftwareApplication.class, args);
            
        }

这是控制器（解释我的意图）：

package com.project.biddingSoft.controller;
public class ServletInitializer extends SpringBootServletInitializer {
  
    @Autowired
    private DaoServiceImpl daoServiceImpl;
   
   configure method etc..

    @PostMapping(path = "/addent")
    ResponseEntity<Object> addNewEntity(@RequestBody IStorable entity) {

        try {
            
            daoServiceImpl.persistEntity(entity);
        } catch (IllegalArgumentException e) {
            throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, e.getMessage());
        }

        return new ResponseEntity("Object updated successfully", HttpStatus.CREATED);

    }
}

还有我的服务：

package com.project.biddingSoft.service;
public class DaoServiceImpl {

    @Autowired
    private IRepo iRepo; 
    
    public  boolean persistEntity(IStorable entity ) throws IllegalArgumentException {
         
        try {
            IStorable success = iRepo.save(entity);
        }
        catch(IllegalArgumentException e) {
            logger.info("Error is " ,e);
            throw e; 
        }
        return true; 
        
    }
}

这是我得到的错误：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
12:04:51.237 [restartedMain] ERROR o.s.boot.SpringApplication - Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'servletInitializer': Unsatisfied dependency expressed through field 'daoServiceImpl'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'daoServiceImpl': Unsatisfied dependency expressed through field 'iRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IRepo' defined in com.project.biddingSoft.dao.IRepo defined in @EnableJpaRepositories declared on BiddingSoftwareApplication: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: interface com.project.biddingSoft.model.IStorable
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:917)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:582)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:326)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1311)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300)
    at com.project.biddingSoft.BiddingSoftwareApplication.main(BiddingSoftwareApplication.java:29)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'daoServiceImpl': Unsatisfied dependency expressed through field 'iRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IRepo' defined in com.project.biddingSoft.dao.IRepo defined in @EnableJpaRepositories declared on BiddingSoftwareApplication: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: interface com.project.biddingSoft.model.IStorable
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657)
    ... 26 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IRepo' defined in com.project.biddingSoft.dao.IRepo defined in @EnableJpaRepositories declared on BiddingSoftwareApplication: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: interface com.project.biddingSoft.model.IStorable
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1786)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657)
    ... 40 common frames omitted
Caused by: java.lang.IllegalArgumentException: Not a managed type: interface com.project.biddingSoft.model.IStorable
    at org.hibernate.metamodel.internal.MetamodelImpl.managedType(MetamodelImpl.java:582)
    at org.hibernate.metamodel.internal.MetamodelImpl.managedType(MetamodelImpl.java:85)
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:75)
    at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:66)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:229)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:179)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:162)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:72)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:281)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:323)
    at org.springframework.data.util.Lazy.getNullable(Lazy.java:230)
    at org.springframework.data.util.Lazy.get(Lazy.java:114)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:329)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:144)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1845)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782)
    ... 50 common frames omitted

编辑：

我尝试将 IStorable 更改为 Storable 并让我的实体类扩展它而不是 IStorable：

@MappedSuperclass
public  class Storable {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    protected  Long id;
    
    public void setId(Long id) {
        this.id = id;
    }
    public Long getId() {
        return id;
    }
}

但是现在我在邮递员中发出我的帖子请求时收到以下错误：

 "status": 500,
    "error": "Internal Server Error",
    "trace": "org.springframework.dao.InvalidDataAccessApiUsageException: Unknown entity: com.project.biddingSoft.domain.Storable; nested exception is java.lang.IllegalArgumentException: Unknown entity: com.project.biddingSoft.domain.Storable\r\n\tat org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:374)\r\n\tat org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:235)\r\n\tat org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:551)\r\n\tat org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:61)\r\n\tat org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:242)\r\n\tat org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:152)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)\r\n\tat org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:174)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)\r\n\tat org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)\r\n\tat org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215)\r\n\tat com.sun.proxy.$Proxy94.save(Unknown Source)\r\n\tat com.project.biddingSoft.service.DaoServiceImpl.persistEntity(DaoServiceImpl.java:36)\r\n\tat com.project.biddingSoft.controller.ServletInitializer.addNewEntity(ServletInitializer.java:77)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)\r\n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\r\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:564)\r\n\tat org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)\r\n\tat org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)\r\n\tat org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962)\r\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)\r\n\tat org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)\r\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:652)\r\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)\r\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:733)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\r\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\r\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\r\n\tat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\r\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\r\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)\r\n\tat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)\r\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)\r\n\tat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)\r\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)\r\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)\r\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346)\r\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)\r\n\tat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)\r\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887)\r\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684)\r\n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)\r\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)\r\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)\r\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)\r\n\tat java.base/java.lang.Thread.run(Thread.java:832)\r\nCaused by: java.lang.IllegalArgumentException: Unknown entity: com.project.biddingSoft.domain.Storable\r\n\tat org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:723)\r\n\tat org.hibernate.internal.SessionImpl.persist(SessionImpl.java:706)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)\r\n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\r\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:564)\r\n\tat org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:362)\r\n\tat com.sun.proxy.$Proxy91.persist(Unknown Source)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)\r\n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\r\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:564)\r\n\tat org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311)\r\n\tat com.sun.proxy.$Proxy91.persist(Unknown Source)\r\n\tat org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:557)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\r\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)\r\n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\r\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:564)\r\n\tat org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:289)\r\n\tat org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137)\r\n\tat org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121)\r\n\tat org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:524)\r\n\tat org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:285)\r\n\tat org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:531)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)\r\n\tat org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:156)\r\n\tat org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:131)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)\r\n\tat org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123)\r\n\tat org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388)\r\n\tat org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)\r\n\tat org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137)\r\n\t... 59 more\r\n",
    "message": "Unknown entity: com.project.biddingSoft.domain.Storable; nested exception is java.lang.IllegalArgumentException: Unknown entity: com.project.biddingSoft.domain.Storable",
    "path": "/addent"

在不改变 CrudeRepository 的参数化方式的情况下，我怎样才能允许子类的所有属性被持久化？也就是说，让程序忽略 Storable 超类并立即查看它下面的内容？

【问题讨论】：

标签： java spring-boot jpa spring-data

【解决方案1】：

您不能将接口与CrudRepository 一起使用，因为接口本身并不能保证每个实现都将是@Entity（托管类型）。您必须改用 @Entity 的特定实现 - CrudRepository<Lot, Long>。

【讨论】：

但是我怎样才能让我的 ServletInitializer 和 DaoServiceImpl 只需要担心一种类型的对象通过 http/ResponseEntity 并返回，而不是加载不同的实体，每个实体都有自己的表数据库？这最好由所有实体扩展的超类来完成，或者甚至可以使用抽象类？
我查看了数据休息。我可以看到它是如何节省大量样板代码的，但我看不出它会如何解决这个特殊问题？

【解决方案2】：

通过将 CRUD 操作委托给实体对象本身，我解决了一半的问题：

我有我的 LotRepo：

@Repository 
public interface ILotRepo extends  CrudRepository<Lot, Long> {
}

然后我就有了 IStorable 接口：

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", defaultImpl = Lot.class)
@JsonSubTypes({ @JsonSubTypes.Type(value = User.class, name = "user"),
        @JsonSubTypes.Type(value = Bid.class, name = "bid") })
public interface IStorable {

    public Long getId();

    public void setId(Long id);

    public boolean saveToRepo();

    public Iterable<? extends IStorable> findAll();

    public Optional<? extends IStorable> findById(Long id);

    public void deleteById(Long id);
}

然后我有我的实体类：

@Entity
@Component
public class Lot implements IStorable {

    public Lot() {
        }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

setters, getters etc.

    @Transient
    @Autowired
    private static ILotRepo iLotRepo;

   @Autowired
    public void setILotRepo(ILotRepo ilotrepo) {
     iLotRepo = ilotrepo;
   }

    @Override
    public Optional<? extends IStorable> findById(Long id) throws IllegalArgumentException {
        Optional<Lot> lot = null;
        try {
            lot = iLotRepo.findById(id);
        } catch (IllegalArgumentException e) {
            throw e;
        }
        return lot;
    }
  
other CRUD operators' implementations...

}

还有我的控制器：

@RestController
        public class ServletInitializer extends SpringBootServletInitializer {
        
            @Autowired
            private DaoServiceImpl daoServiceImpl;
       
    
     
    @GetMapping(path = "/getent/{id}")
public ResponseEntity<? extends IStorable> getEntity(@PathVariable Long id, @RequestBody IStorable entity) {
    Optional<? extends IStorable> results = daoServiceImpl.getEntityById(id, entity);
    if (results.isPresent())
        return ResponseEntity.ok(results.get());
    else
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
    
            @PostMapping(path = "/addent")
            ResponseEntity<Object> addNewEntity(@RequestBody IStorable entity) {
                try {
        
                    daoServiceImpl.persistEntity(entity);
                } catch (IllegalArgumentException e) {
                    throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, e.getMessage());
                }
                return new ResponseEntity("Object updated successfully", HttpStatus.CREATED);
        
            }
        
        Mappings for other CRUD requests
        }

最后是我的道服务：

    @Service
    @Component
    public class DaoServiceImpl {

    public Optional<? extends IStorable> getEntityById(Long id, IStorable entity) {
        return entity.findById(id);
    }
    
    public boolean persistEntity(IStorable entity) throws IllegalArgumentException {
    
            try {
                entity.saveToRepo();
            } catch (IllegalArgumentException e) {
                logger.info("Error is ", e);
                throw e;
            }
            return true;
    
        }
    
    Services for the other CRUD requests...
    }

所以现在，我可以让任何对象进入（例如 {"type": "user"}）和一个控制器和一个服务来处理它们，而无需知道我们正在处理哪个 IStorable 实现。另一方面，我们将处理存储以及如何处理的责任委托给对象本身。

所以现在我可以有另一个这样的回购：

@Repository
public interface IUserRepo extends  CrudRepository<User, Long> {

}

并将其交给同样实现 IStorable 的 User 类。

【讨论】：

【解决方案3】：

尝试改变这个： CrudRepository

为此：

CrudRepository

【讨论】：

一开始就是这样，但这就是我改变的重点。我可能有另一个也实现 IStorable 的实体类。我不想为每个实体对象（通过 http 请求）分别实现我的 DaoServiceImpl 类中的方法，也不想为每个实体对象一个单独的 repo，就典型的基本 CRUD 操作而言担心吗？