Spring Boot 異常“java.lang.IllegalArgumentException：不是托管類型：”

Question

使用 IntelliJ IDEA，我連接到 MySQL 數據庫，以便我能夠將表用作類。 有了一個模塊，我就做到了。 但是當我嘗試運行一個空的Controller ，拋出了以下異常。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class eu.name.api.MainController
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at eu.name.api.ClubapiApplication.main(ClubapiApplication.java:10) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class eu.name.api.MainController
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 18 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class eu.name.api.MainController
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.obtainBeanInstanceFromFactory(ConfigurationClassEnhancer.java:389) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$1c794fe3.mvcConversionService(<generated>) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.getConfigurableWebBindingInitializer(WebMvcConfigurationSupport.java:566) ~[spring-webmvc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration.getConfigurableWebBindingInitializer(WebMvcAutoConfiguration.java:447) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.requestMappingHandlerAdapter(WebMvcConfigurationSupport.java:526) ~[spring-webmvc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration.requestMappingHandlerAdapter(WebMvcAutoConfiguration.java:402) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$1c794fe3.CGLIB$requestMappingHandlerAdapter$6(<generated>) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$1c794fe3$$FastClassBySpringCGLIB$$b7577e9.invoke(<generated>) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$1c794fe3.requestMappingHandlerAdapter(<generated>) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 19 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class eu.name.api.MainController
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 44 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class eu.name.api.MainController
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1087) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.data.repository.support.Repositories.cacheRepositoryFactory(Repositories.java:95) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.data.repository.support.Repositories.populateRepositoryFactoryInformation(Repositories.java:88) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.data.repository.support.Repositories.<init>(Repositories.java:81) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.data.repository.support.DomainClassConverter.setApplicationContext(DomainClassConverter.java:98) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.data.web.config.SpringDataWebConfiguration.addFormatters(SpringDataWebConfiguration.java:94) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurerComposite.addFormatters(WebMvcConfigurerComposite.java:80) ~[spring-webmvc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration.addFormatters(DelegatingWebMvcConfiguration.java:77) ~[spring-webmvc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.mvcConversionService(WebMvcConfigurationSupport.java:594) ~[spring-webmvc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$1c794fe3.CGLIB$mvcConversionService$32(<generated>) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$1c794fe3$$FastClassBySpringCGLIB$$b7577e9.invoke(<generated>) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$1c794fe3.mvcConversionService(<generated>) ~[spring-boot-autoconfigure-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 45 common frames omitted
Caused by: java.lang.IllegalArgumentException: Not a managed type: class eu.name.api.MainController
    at org.hibernate.jpa.internal.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:210) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:70) ~[spring-data-jpa-1.11.3.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:68) ~[spring-data-jpa-1.11.3.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:153) ~[spring-data-jpa-1.11.3.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:100) ~[spring-data-jpa-1.11.3.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:82) ~[spring-data-jpa-1.11.3.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:199) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:277) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:263) ~[spring-data-commons-1.13.3.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:101) ~[spring-data-jpa-1.11.3.RELEASE.jar:na]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 70 common frames omitted

ClubapiApplication.java

package eu.name.api;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ClubapiApplication {

    public static void main(String[] args) {
        SpringApplication.run(ClubapiApplication.class, args);
    }
}

MainController.java這是發生異常的類，如您在最終異常消息中所見。

package eu.name.api;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.*;

import org.springframework.web.bind.annotation.*;


@Controller
@RequestMapping(path="/api")
public class MainController {
    @Autowired
    private UserRepository userRepository;


}

UserRepository

package eu.name.api;

import org.springframework.data.repository.CrudRepository;
import eu.name.model.*;

public interface UserRepository extends CrudRepository<UserEntity, Long> {

}

我不能發布所有的模塊數據庫類，我只會發布不完整的UserEntity.java類，因為我超過了 stackoverflow 上的最大行數。

    package eu.name.model;

import javax.persistence.*;
import java.sql.Timestamp;

@Entity
@Table(name = "user", schema = "mydb")
@IdClass(UserEntityPK.class)
public class UserEntity {
    @Id
    @GeneratedValue
    private int id;
    @Column
    private String role;
    @Column
    private byte active;
    @Column(name="company_name")
    private String companyName;
    @Column
    private String surname;
    @Column
    private String midname;
    @Column
    private String firstname;
    @Column
    private String gender;
    @Column(name="birth_date")
    private Timestamp birthDate;
    @Column
    private String street;
    @Column(name="street_no")
    private String streetNo;
    @Column
    private String zip;
    @Column
    private String phone;
    @Column
    private String mobile;
    @Column
    private String email;
    @Column
    private byte authenticated;
    @Column(name="create_date")
    private Timestamp createDate;
    @Column(name="modify_date")
    private Timestamp modifyDate;
    @Column
    private String comments;
    @Column
    private String pin;
    private ConnectionEntity connectionById;
    private TransactionEntity transactionById;
    private TransactionEntity transactionById_0;
    @Column(name="category_id")
    private CategoryEntity categoryByCategoryId;
    @Column(name="city_id")
    private CityEntity cityByCityId;

    @Id
    @Column(name = "id")
    public int getId() {
        return id;
    }

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

    @Basic
    @Column(name = "role")
    public String getRole() {
        return role;
    }

    public void setRole(String role) {
        this.role = role;
    }

    @Basic
    @Column(name = "active")
    public byte getActive() {
        return active;
    }

    public void setActive(byte active) {
        this.active = active;
    }

    @Basic
    @Column(name = "company_name")
    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }

    @Basic
    @Column(name = "surname")
    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }



    public void setAuthenticated(byte authenticated) {
        this.authenticated = authenticated;
    }

    @Basic
    @Column(name = "create_date")
    public Timestamp getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Timestamp createDate) {
        this.createDate = createDate;
    }

    @Basic
    @Column(name = "modify_date")
    public Timestamp getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Timestamp modifyDate) {
        this.modifyDate = modifyDate;
    }

    @Basic
    @Column(name = "comments")
    public String getComments() {
        return comments;
    }

    public void setComments(String comments) {
        this.comments = comments;
    }

    @Basic
    @Column(name = "pin")
    public String getPin() {
        return pin;
    }

    public void setPin(String pin) {
        this.pin = pin;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        UserEntity that = (UserEntity) o;

        if (id != that.id) return false;
        if (active != that.active) return false;
        if (authenticated != that.authenticated) return false;
        if (role != null ? !role.equals(that.role) : that.role != null) return false;
        if (companyName != null ? !companyName.equals(that.companyName) : that.companyName != null) return false;
        if (surname != null ? !surname.equals(that.surname) : that.surname != null) return false;
        if (midname != null ? !midname.equals(that.midname) : that.midname != null) return false;
        if (firstname != null ? !firstname.equals(that.firstname) : that.firstname != null) return false;
        if (gender != null ? !gender.equals(that.gender) : that.gender != null) return false;
        if (birthDate != null ? !birthDate.equals(that.birthDate) : that.birthDate != null) return false;
        if (street != null ? !street.equals(that.street) : that.street != null) return false;
        if (streetNo != null ? !streetNo.equals(that.streetNo) : that.streetNo != null) return false;
        if (zip != null ? !zip.equals(that.zip) : that.zip != null) return false;
        if (phone != null ? !phone.equals(that.phone) : that.phone != null) return false;
        if (mobile != null ? !mobile.equals(that.mobile) : that.mobile != null) return false;
        if (email != null ? !email.equals(that.email) : that.email != null) return false;
        if (createDate != null ? !createDate.equals(that.createDate) : that.createDate != null) return false;
        if (modifyDate != null ? !modifyDate.equals(that.modifyDate) : that.modifyDate != null) return false;
        if (comments != null ? !comments.equals(that.comments) : that.comments != null) return false;
        if (pin != null ? !pin.equals(that.pin) : that.pin != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + (role != null ? role.hashCode() : 0);
        result = 31 * result + (int) active;
        result = 31 * result + (companyName != null ? companyName.hashCode() : 0);
        result = 31 * result + (surname != null ? surname.hashCode() : 0);
        result = 31 * result + (midname != null ? midname.hashCode() : 0);
        result = 31 * result + (firstname != null ? firstname.hashCode() : 0);
        result = 31 * result + (gender != null ? gender.hashCode() : 0);
        result = 31 * result + (birthDate != null ? birthDate.hashCode() : 0);
        result = 31 * result + (street != null ? street.hashCode() : 0);
        result = 31 * result + (streetNo != null ? streetNo.hashCode() : 0);
        result = 31 * result + (zip != null ? zip.hashCode() : 0);
        result = 31 * result + (phone != null ? phone.hashCode() : 0);
        result = 31 * result + (mobile != null ? mobile.hashCode() : 0);
        result = 31 * result + (email != null ? email.hashCode() : 0);
        result = 31 * result + (int) authenticated;
        result = 31 * result + (createDate != null ? createDate.hashCode() : 0);
        result = 31 * result + (modifyDate != null ? modifyDate.hashCode() : 0);
        result = 31 * result + (comments != null ? comments.hashCode() : 0);
        result = 31 * result + (pin != null ? pin.hashCode() : 0);
        return result;
    }



    @ManyToOne
    @JoinColumn(name = "category_id", referencedColumnName = "id", nullable = false)
    public CategoryEntity getCategoryByCategoryId() {
        return categoryByCategoryId;
    }

    public void setCategoryByCategoryId(CategoryEntity categoryByCategoryId) {
        this.categoryByCategoryId = categoryByCategoryId;
    }

    @ManyToOne
    @JoinColumn(name = "city_id", referencedColumnName = "id")
    public CityEntity getCityByCityId() {
        return cityByCityId;
    }

    public void setCityByCityId(CityEntity cityByCityId) {
        this.cityByCityId = cityByCityId;
    }
}

數據庫

模塊

項目結構

數據庫方案

編輯我用一個非常簡單的數據庫測試了我的項目，該數據庫只包含一個表和兩個字段，並且發生了相同的異常！

Answer 1

問題是UserEntity在不同的包中。

嘗試將這些注釋添加到您的ClubapiApplication類中：

@Configuration
@ComponentScan({"eu.upcom.api", "eu.upcom.model"})

Answer 2

在我的情況下，同時使用多個包以下工作：

@Configuration
@ComponentScan(basePackages = {"eu.upcom.api", "eu.upcom.model"})

其中 basePackages 是一個字符串數組，只是要掃描的包。 不知道為什么 eu.upcom.* 在我的情況下不起作用。

Answer 3

我有完全相同的問題。 我通過在 MainContoller.java 中包含它來解決它

private UserRepository userRepository;

@Autowired
public MainController(UserRepository userRepository)
{
    this.userRepository = userRepository;
}

Answer 4

我有兩個獨立的項目shopmeCommon和shopmeWebParent所有常見的東西都在shopemeCommon項目中。 我的文件夾結構如下。 我正在運行shopmeWebParent項目。

我收到了cannot create the Repository Bean的錯誤。 實際上，這里發生了什么。 我為JpaRepository<>提供了 Role 實體參數，該實體位於shopmeCommon模塊中。 所以spring無法配置它。 這個異常首先發生在這里。 所以這就是為什么它顯示為存儲庫異常。

在應用程序的起點。 在@EntityScan({<package_path>})數組下指定 Beans（實體和存儲庫）包，如下所示。

package com.shopme.admin;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;

@SpringBootApplication
@EntityScan({"com.shopme.common.entity", "com.shopme.admin.user"}) //this is the important line
public class ShopmeBackEndApplication {

    public static void main(String[] args) {
        SpringApplication.run(ShopmeBackEndApplication.class, args);
    }

}

Answer 5

該問題與 UserEntity 類有關。 類本身已被注釋，但沒有注釋任何屬性。

像下面這樣注釋你的類：

@Id
@GeneratedValue
private int id;
@Column
private String role;
@Column
private byte active;
@Column(name="company_name") //Example to show how to change the name to match a differently named column in MySQL. 
private String companyName;

您可能還會發現讓您的存儲庫擴展JpaRepository而不是CrudRepository接口的價值 - 它會公開不同的 JPA 特定方法，例如SaveAndFlush

Answer 6

UserRepository 缺少 @Repository 注釋。