JPA - UnsatisfiedDependencyException：使用名称创建 bean 时出错：通过字段表示的不满足依赖关系
JPA - UnsatisfiedDependencyException: Error creating bean with name : Unsatisfied dependency expressed through field
我知道这个主题已经有很多答案，但我仍然无法在这里找到适合我的问题的答案。详情如下：
控制器：
@RestController
@RequestMapping(path = "/api")
public class RoleController {
@Autowired
private RoleService roleService;
@PostMapping("/addRoleByUserId/{userId}/{roleId}")
public Role addRoleByUserId(@PathVariable(value = "userId") long userId, @PathVariable(value = "roleId") long roleId) {
try {
return roleService.addRoleByUserId(roleId, userId);
} catch (Exception Ex) {
return null;
}
}
}
服务：
@Service
public class RoleService {
@Autowired
private RoleRepository roleRepository;
@Autowired
private AssocUserRoleRepository assocUserRoleRepository;
@Autowired
private UserRepository userRepository;
// TODO missing userRepository verification
public Role addRoleByUserId(long roleId, long userId) {
try {
// Verifications if data recieved is valid
if (roleRepository.findOne(roleId) != null) {
// If it's valid
AssocUserRole newAssoc = new AssocUserRole();
newAssoc.setRole_id(roleRepository.findOne(roleId));
//newAssoc.setUser_id(userRepository.findOne(userId));
assocUserRoleRepository.save(newAssoc);
return roleRepository.findOne(roleId);
} else {
// Not valid
return new Role();
}
} catch (Exception Ex) {
return null;
}
}
}
存储库：
@Repository
public interface RoleRepository extends JpaRepository<Role, Long> {
Role findOne(long id);
}
角色本身：
@Entity
@Table(name = "TB_Role")
public class Role implements Serializable{
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "role_id")
private long role_id;
@Column(name = "name",nullable = false, unique = true)
@NotEmpty(message = "*Please provide your role name")
private String name;
@Column(name = "active")
boolean active;
public long getId() {
return role_id;
}
public void setId(long id) {
this.role_id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isActive() {
return active;
}
public void setActive(boolean active) {
this.active = active;
}
public String getRole() {
return name;
}
public void setRole(String role) {
this.name = role;
}
}
事实是，似乎没有任何问题，但我仍然无法弄清楚我是如何遇到这种问题的：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-12-29 02:32:10.640 ERROR 10228 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleController': Unsatisfied dependency expressed through field 'roleService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleService': Unsatisfied dependency expressed through field 'roleRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=14=](AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at com.homelancer.HomelancerApplication.main(HomelancerApplication.java:15) [classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleService': Unsatisfied dependency expressed through field 'roleRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=14=](AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
... 19 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1803) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=14=](AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
... 32 common frames omitted
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:103) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:106) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:211) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:574) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery(RepositoryFactorySupport.java:567) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_161]
at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[na:1.8.0_161]
at java.util.Collections$UnmodifiableCollection.forEachRemaining(Collections.java:1049) ~[na:1.8.0_161]
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_161]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_161]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:569) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new[=14=](RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_161]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:332) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet(RepositoryFactoryBeanSupport.java:297) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.util.Lazy.getNullable(Lazy.java:212) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:121) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1862) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1799) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
... 42 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property findOne found for type Role!
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:94) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:382) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:358) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.lambda$from[=14=](PropertyPath.java:311) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.concurrent.ConcurrentMap.computeIfAbsent(ConcurrentMap.java:324) ~[na:1.8.0_161]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:293) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:276) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:82) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new[=14=](PartTree.java:250) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:175) ~[na:1.8.0_161]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_161]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_161]
at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:251) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new[=14=](PartTree.java:380) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:175) ~[na:1.8.0_161]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_161]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_161]
at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:381) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:93) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:96) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
... 68 common frames omitted
关于此的任何想法都会有所帮助，我相信这一定是一个很容易解决的任务，但我目前完全不适合使用 JPA 和 Spring，所以任何帮助都会创造奇迹.
非常感谢
在没有实际创建项目和运行它的单元或集成测试的情况下，这只是一种预感，但请尝试将原始 long 类型更改为其相应的包装类型 Long 以匹配您的类型参数（即 - JpaRepository<Role, Long>）：
变化：
@Repository
public interface RoleRepository extends JpaRepository<Role, Long> {
Role findOne(long id);
}
至：
@Repository
public interface RoleRepository extends JpaRepository<Role, Long> {
Role findOne(Long id);
}
如您在错误日志中所见，Spring 无法创建 roleRepository bean 并显示错误 No 属性 findOne找到角色类型！
原因是您在 RoleRepository 接口中创建了 findOne 方法，但是您的 Role class 没有名为 one 的属性.此外，方法名称不遵循模式 findBy[Atribute] 并且 Spring 试图在您的 Role class。此模式和具有相同名称的属性对于允许 Spring 执行 'the magic' 并自动创建允许您通过id.
在您的示例中，Role class 具有属性 role_id，因为您使用 @Column(name = "role_id") 强制 Spring 使用自定义列名称，您可以将属性重命名为 id，并将存储库 class 中的方法 findOne 重命名为 findById。
额外提示：查看spring CrudRepository class，它默认有更多方法。
主要问题在于方法
Role findOne(long id);
这将在您的实体中搜索属性一，但您没有该实体。因此，您可以进行如下更改：
Role findByRoleId(long id);
此外，不要对变量使用蛇形大小写。 java中变量的命名遵循驼峰命名法。
我知道这个主题已经有很多答案，但我仍然无法在这里找到适合我的问题的答案。详情如下：
控制器：
@RestController
@RequestMapping(path = "/api")
public class RoleController {
@Autowired
private RoleService roleService;
@PostMapping("/addRoleByUserId/{userId}/{roleId}")
public Role addRoleByUserId(@PathVariable(value = "userId") long userId, @PathVariable(value = "roleId") long roleId) {
try {
return roleService.addRoleByUserId(roleId, userId);
} catch (Exception Ex) {
return null;
}
}
}
服务：
@Service
public class RoleService {
@Autowired
private RoleRepository roleRepository;
@Autowired
private AssocUserRoleRepository assocUserRoleRepository;
@Autowired
private UserRepository userRepository;
// TODO missing userRepository verification
public Role addRoleByUserId(long roleId, long userId) {
try {
// Verifications if data recieved is valid
if (roleRepository.findOne(roleId) != null) {
// If it's valid
AssocUserRole newAssoc = new AssocUserRole();
newAssoc.setRole_id(roleRepository.findOne(roleId));
//newAssoc.setUser_id(userRepository.findOne(userId));
assocUserRoleRepository.save(newAssoc);
return roleRepository.findOne(roleId);
} else {
// Not valid
return new Role();
}
} catch (Exception Ex) {
return null;
}
}
}
存储库：
@Repository
public interface RoleRepository extends JpaRepository<Role, Long> {
Role findOne(long id);
}
角色本身：
@Entity
@Table(name = "TB_Role")
public class Role implements Serializable{
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "role_id")
private long role_id;
@Column(name = "name",nullable = false, unique = true)
@NotEmpty(message = "*Please provide your role name")
private String name;
@Column(name = "active")
boolean active;
public long getId() {
return role_id;
}
public void setId(long id) {
this.role_id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isActive() {
return active;
}
public void setActive(boolean active) {
this.active = active;
}
public String getRole() {
return name;
}
public void setRole(String role) {
this.name = role;
}
}
事实是，似乎没有任何问题，但我仍然无法弄清楚我是如何遇到这种问题的：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-12-29 02:32:10.640 ERROR 10228 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleController': Unsatisfied dependency expressed through field 'roleService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleService': Unsatisfied dependency expressed through field 'roleRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=14=](AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at com.homelancer.HomelancerApplication.main(HomelancerApplication.java:15) [classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleService': Unsatisfied dependency expressed through field 'roleRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=14=](AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
... 19 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1803) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=14=](AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
... 32 common frames omitted
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract com.homelancer.models.Role com.homelancer.repository.RoleRepository.findOne(long)! No property findOne found for type Role!
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:103) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:106) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:211) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:574) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery(RepositoryFactorySupport.java:567) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_161]
at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[na:1.8.0_161]
at java.util.Collections$UnmodifiableCollection.forEachRemaining(Collections.java:1049) ~[na:1.8.0_161]
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_161]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_161]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:569) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new[=14=](RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_161]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:332) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet(RepositoryFactoryBeanSupport.java:297) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.util.Lazy.getNullable(Lazy.java:212) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:121) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1862) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1799) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
... 42 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property findOne found for type Role!
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:94) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:382) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:358) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.lambda$from[=14=](PropertyPath.java:311) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.concurrent.ConcurrentMap.computeIfAbsent(ConcurrentMap.java:324) ~[na:1.8.0_161]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:293) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:276) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:82) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new[=14=](PartTree.java:250) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:175) ~[na:1.8.0_161]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_161]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_161]
at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:251) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new[=14=](PartTree.java:380) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:193) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.accept(ReferencePipeline.java:175) ~[na:1.8.0_161]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_161]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_161]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_161]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_161]
at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:381) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:93) ~[spring-data-commons-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:96) ~[spring-data-jpa-2.2.0.RELEASE.jar:2.2.0.RELEASE]
... 68 common frames omitted
关于此的任何想法都会有所帮助，我相信这一定是一个很容易解决的任务，但我目前完全不适合使用 JPA 和 Spring，所以任何帮助都会创造奇迹.
非常感谢
在没有实际创建项目和运行它的单元或集成测试的情况下，这只是一种预感，但请尝试将原始 long 类型更改为其相应的包装类型 Long 以匹配您的类型参数（即 - JpaRepository<Role, Long>）：
变化：
@Repository
public interface RoleRepository extends JpaRepository<Role, Long> {
Role findOne(long id);
}
至：
@Repository
public interface RoleRepository extends JpaRepository<Role, Long> {
Role findOne(Long id);
}
如您在错误日志中所见，Spring 无法创建 roleRepository bean 并显示错误 No 属性 findOne找到角色类型！
原因是您在 RoleRepository 接口中创建了 findOne 方法，但是您的 Role class 没有名为 one 的属性.此外，方法名称不遵循模式 findBy[Atribute] 并且 Spring 试图在您的 Role class。此模式和具有相同名称的属性对于允许 Spring 执行 'the magic' 并自动创建允许您通过id.
在您的示例中，Role class 具有属性 role_id，因为您使用 @Column(name = "role_id") 强制 Spring 使用自定义列名称，您可以将属性重命名为 id，并将存储库 class 中的方法 findOne 重命名为 findById。
额外提示：查看spring CrudRepository class，它默认有更多方法。
主要问题在于方法
Role findOne(long id);
这将在您的实体中搜索属性一，但您没有该实体。因此，您可以进行如下更改：
Role findByRoleId(long id);
此外，不要对变量使用蛇形大小写。 java中变量的命名遵循驼峰命名法。