Spring Boot's DAO layer inherits JPA boot error

Org.springframework.beans.factory.UnsatisfiedDependencyException:Error creating Bean with Name ' Xxxcontroller ': Unsatisfied dependency expressed through field ' Xxxservice '; Nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException:Error creating beans with Name ' Xxxtservice ': Unsatisfied dependency expressed through field ' Xxxdao '; Nested exception is org.springframework.beans.factory.BeanCreationException:Error creating beans with Name ' Xxxdao ': Invocation of Init method failed; Nested exception is Java.lang.IllegalArgumentException:Not a managed type:class baoming.model.xxx at Org.springframewor K.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject ( autowiredannotationbeanpostprocessor.java:587) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.annotation.InjectionMetadata.inject (injectionmetadata.java:91) ~[ Spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beanS.factory.annotation.autowiredannotationbeanpostprocessor.postprocesspropertyvalues ( autowiredannotationbeanpostprocessor.java:373) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean ( abstractautowirecapablebeanfactory.java:1344) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean ( abstractautowirecapablebeanfactory.java:578) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean ( abstractautowirecapablebeanfactory.java:501) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.abstractbeanfactory.lambda$dogetbean$0 (AbstractBeanFactory.java:317) ~[spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton (Defaultsingletonbeanregistry.java:228) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean (abstractbeanfactory.java:315) ~[ Spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.support.AbstractBeanFactory.getBean (abstractbeanfactory.java:199) ~[ Spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons ( defaultlistablebeanfactory.java:760) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization ( abstractapplicationcontext.java:869) ~[spring-context-5.0.5.release.jar:5.0.5.release] at Org.springframework.context.support.AbstractApplicationContext.refresh (abstractapplicationcontext.java:550) ~[ Spring-context-5.0.5.release.jar:5.0.5.release] At Org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.reFresh (servletwebserverapplicationcontext.java:140) ~[spring-boot-2.0.1.release.jar:2.0.1.release] at Org.springframework.boot.SpringApplication.refresh (springapplication.java:759) [Spring-boot-2.0.1.release.jar : 2.0.1.RELEASE] at Org.springframework.boot.SpringApplication.refreshContext (springapplication.java:395) [ Spring-boot-2.0.1.release.jar:2.0.1.release] at Org.springframework.boot.SpringApplication.run ( springapplication.java:327) [Spring-boot-2.0.1.release.jar:2.0.1.release] at Org.springframework.boot.SpringApplication.run (springapplication.java:1255) [Spring-boot-2.0.1.release.jar : 2.0.1.RELEASE] at Org.springframework.boot.SpringApplication.run (springapplication.java:1243) [ Spring-boot-2.0.1.release.jar:2.0.1.release] at baoming. Loveurlapplication.main (LOVEURLAPPLICATION.JAVA:14) [Classes/:na] caused by: Org.springframework.beans.factory.UnsatisfiedDependencyException:Error creating Bean with Name ' Xxxservice ': Unsatisfied dependency expressed through field ' EFFECTISEGHTDAO '; Nested exception is org.springframework.beans.factory.BeanCreationException:Error creating beans with Name ' Effectiseghtdao ': Invocation of Init method failed; Nested exception is Java.lang.IllegalArgumentException:Not a managed type:class baoming.model.xxx at Org.springframewor K.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject ( autowiredannotationbeanpostprocessor.java:587) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.annotation.InjectionMetadata.inject (injectionmetadata.java:91) ~[ Spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues ( autowiredannotationbeanpostprocessor.java:373) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean ( abstractautowirecapablebeanfactory.java:1344) ~[spring-beans-5.0.5.release.Jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean ( abstractautowirecapablebeanfactory.java:578) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean ( abstractautowirecapablebeanfactory.java:501) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.abstractbeanfactory.lambda$dogetbean$0 (AbstractBeanFactory.java:317) ~[spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton ( defaultsingletonbeanregistry.java:228) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean (abstractbeanfactory.java:315) ~[ Spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.support.AbstractBeanFactory.getBean (abstractbeanfactory.java:199) ~[ Spring-beanS-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate (dependencydescriptor.java:251) ~ [Spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency ( defaultlistablebeanfactory.java:1138) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency ( defaultlistablebeanfactory.java:1065) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject (autowiredannotationbeanpostprocessor.java:584) ~[spring-beans-5.0.5.release.jar:5.0.5.release] ... Common frames omitted caused by:org.springframework.beans.factory.BeanCreationException:Error creating bean with Nam E ' Effectiseghtdao ': Invocation of Init method failed; Nested exception is java.lang.IllegalArgumentException:Not a managed Type:class baoming.model.xxx at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean ( abstractautowirecapablebeanfactory.java:1702) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean ( abstractautowirecapablebeanfactory.java:579) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean ( abstractautowirecapablebeanfactory.java:501) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.abstractbeanfactory.lambda$dogetbean$0 (AbstractBeanFactory.java:317) ~[spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton ( defaultsingletonbeanregistry.java:228) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractBeAnfactory.dogetbean (abstractbeanfactory.java:315) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractBeanFactory.getBean (abstractbeanfactory.java:199) ~[ Spring-beans-5.0.5.release.jar:5.0.5.release] At Org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate (dependencydescriptor.java:251) ~ [Spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency ( defaultlistablebeanfactory.java:1138) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency ( defaultlistablebeanfactory.java:1065) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject (autowiredannotationbeanpostprocessor.java:584) ~[spring-beans-5.0.5.release.jar:5.0.5.release] ... Common FramesOmitted caused By:java.lang.IllegalArgumentException:Not a managed type:class baoming.model.xxx at Org.hibernate.metam
	Odel.internal.MetamodelImpl.managedType (metamodelimpl.java:472) ~[hibernate-core-5.2.16.final.jar:5.2.16.final] At Org.springframework.data.jpa.repository.support.jpametamodelentityinformation.<init> ( jpametamodelentityinformation.java:73) ~[spring-data-jpa-2.0.6.release.jar:2.0.6.release] at Org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation ( jpaentityinformationsupport.java:66) ~[spring-data-jpa-2.0.6.release.jar:2.0.6.release] at Org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation ( jparepositoryfactory.java:181) ~[spring-data-jpa-2.0.6.release.jar:2.0.6.release] at Org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository ( jparepositoryfactory.java:119) ~[spring-data-jpa-2.0.6.release.jar:2.0.6.release] at Org.springframework.data.jpa.repositoRy.support.JpaRepositoryFactory.getTargetRepository (jparepositoryfactory.java:102) ~[ Spring-data-jpa-2.0.6.release.jar:2.0.6.release] At Org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository ( repositoryfactorysupport.java:298) ~[spring-data-commons-2.0.6.release.jar:2.0.6.release] at Org.springframework.data.repository.core.support.repositoryfactorybeansupport.lambda$afterpropertiesset$3 ( repositoryfactorybeansupport.java:287) ~[spring-data-commons-2.0.6.release.jar:2.0.6.release] at Org.springframework.data.util.Lazy.getNullable (lazy.java:141) ~[spring-data-commons-2.0.6.release.jar:2.0.6. RELEASE] at Org.springframework.data.util.Lazy.get (lazy.java:63) ~[spring-data-commons-2.0.6.release.jar:2.0.6. RELEASE] at Org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet ( repositoryfactorybeansupport.java:290) ~[spring-data-commons-2.0.6.release.jar:2.0.6.release] at Org.springframework.data.jpa.repository.support.Jparepositoryfactorybean.afterpropertiesset (jparepositoryfactorybean.java:102) ~[ Spring-data-jpa-2.0.6.release.jar:2.0.6.release] At Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods ( abstractautowirecapablebeanfactory.java:1761) ~[spring-beans-5.0.5.release.jar:5.0.5.release] at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean ( abstractautowirecapablebeanfactory.java:1698) ~[spring-beans-5.0.5.release.jar:5.0.5.release] ... Common frames omitted

XXX is the name of the error

Solutions

DAO layer Inherits JPA Then there is the entity class corresponding to the database, then this entity class XXX must have annotations--@Entity--

Import javax.persistence.Entity;