Spring 引导 JPA 外键变量无法从 mysql db 读取数据
Spring boot JPA foreign key variable can not read data from mysql db
我正在为用户和公司创建两个table，多个用户可以属于一个公司，所以是多对一的关系。但是由于某些原因，company_id外键变量无法从公司table中提取数据（请看下面的截图）。我已经谷歌搜索了一段时间，但没有找到任何解决方案。非常感谢您的帮助。
UserEntity.java
@Entity(name = "Users")
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@SuperBuilder
public class UserEntity extends DateAudit {
private static final long serialVersionUID = -6622427995561357149L;
@Id
@GeneratedValue()
@Type(type = "uuid-char")
@Column(columnDefinition = "VARCHAR(36)", updatable = false, nullable = false)
private UUID id;
@Column(unique = true, nullable = false)
private String username;
@Column(nullable = false)
private String password;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "company_id")
private CompanyEntity company; //can not extract data
@OneToMany(mappedBy = "user", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private List<ItemEntity> safetyPlans; //but this works
}
CompanyEntity.java
@Entity(name = "Companies")
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@SuperBuilder
public class CompanyEntity extends DateAudit {
private static final long serialVersionUID = -6622427995561357151L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false)
private String name;
@Column(nullable = false)
private String companyId;
@OneToMany(mappedBy = "company", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private List<UserEntity> users;
}
UserRepository.java
public interface UserRepository extends CrudRepository<UserEntity, String>, IUserRepository {
Optional<UserEntity> findOneById(UUID id);
Optional<UserEntity> findByUsername(String username);
List<UserEntity> findAll();
}
服务class
@Service
public class UserDetailsServiceImpl implements UserDetailsService {
private UserRepository userRepository;
public UserDetailsServiceImpl(UserRepository userRepository) {
this.userRepository = userRepository;
}
@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserEntity entity = userRepository.findByUsername(username).orElseThrow(() -> new UsernameNotFoundException(username));
return new User(entity.getUsername(), entity.getPassword(), emptyList());
}
}
公司table
用户table
读取值时的错误日志（例如entity.getCompany().getName()）：
2021-09-10 17:29:02.747 ERROR 88245 --- [nio-5000-exec-1] c.a.m.auth.JWTAuthenticationFilter : An internal error occurred while trying to authenticate the user.
org.springframework.security.authentication.InternalAuthenticationServiceException: could not initialize proxy [com.ahurufoundation.management.data.mysql.entity.user.CompanyEntity#1] - no Session
at org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:108) ~[spring-security-core-5.4.5.jar:5.4.5]
DaoAuthenticationProvider.java:108
at org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:133) ~[spring-security-core-5.4.5.jar:5.4.5]
AbstractUserDetailsAuthenticationProvider.java:133
at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:182) ~[spring-security-core-5.4.5.jar:5.4.5]
ProviderManager.java:182
at com.ahurufoundation.management.auth.JWTAuthenticationFilter.attemptAuthentication(JWTAuthenticationFilter.java:41) ~[main/:na]
JWTAuthenticationFilter.java:41
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:222) [spring-security-web-5.4.5.jar:5.4.5]
AbstractAuthenticationProcessingFilter.java:222
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212) [spring-security-web-5.4.5.jar:5.4.5]
AbstractAuthenticationProcessingFilter.java:212
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103) [spring-security-web-5.4.5.jar:5.4.5]
LogoutFilter.java:103
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89) [spring-security-web-5.4.5.jar:5.4.5]
LogoutFilter.java:89
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91) [spring-web-5.3.4.jar:5.3.4]
CorsFilter.java:91
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) [spring-security-web-5.4.5.jar:5.4.5]
HeaderWriterFilter.java:90
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) [spring-security-web-5.4.5.jar:5.4.5]
HeaderWriterFilter.java:75
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110) [spring-security-web-5.4.5.jar:5.4.5]
SecurityContextPersistenceFilter.java:110
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80) [spring-security-web-5.4.5.jar:5.4.5]
SecurityContextPersistenceFilter.java:80
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55) [spring-security-web-5.4.5.jar:5.4.5]
WebAsyncManagerIntegrationFilter.java:55
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55) [spring-security-web-5.4.5.jar:5.4.5]
WebAsyncManagerIntegrationFilter.java:55
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:211
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183) [spring-security-web-5.4.5.jar:5.4.5]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) [spring-web-5.3.4.jar:5.3.4]
DelegatingFilterProxy.java:358
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) [spring-web-5.3.4.jar:5.3.4]
DelegatingFilterProxy.java:271
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.3.4.jar:5.3.4]
RequestContextFilter.java:100
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.3.4.jar:5.3.4]
FormContentFilter.java:93
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.3.4.jar:5.3.4]
CharacterEncodingFilter.java:201
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardWrapperValve.java:202
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardContextValve.java:97
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.43.jar:9.0.43]
AuthenticatorBase.java:542
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardHostValve.java:143
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.43.jar:9.0.43]
ErrorReportValve.java:92
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardEngineValve.java:78
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) [tomcat-embed-core-9.0.43.jar:9.0.43]
CoyoteAdapter.java:346
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) [tomcat-embed-core-9.0.43.jar:9.0.43]
Http11Processor.java:374
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.43.jar:9.0.43]
AbstractProcessorLight.java:65
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) [tomcat-embed-core-9.0.43.jar:9.0.43]
AbstractProtocol.java:887
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) [tomcat-embed-core-9.0.43.jar:9.0.43]
NioEndpoint.java:1684
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.43.jar:9.0.43]
SocketProcessorBase.java:49
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_221]
ThreadPoolExecutor.java:1149
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_221]
ThreadPoolExecutor.java:624
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.43.jar:9.0.43]
TaskThread.java:61
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_221]
Thread.java:748
Caused by: org.hibernate.LazyInitializationException: could not initialize proxy [com.ahurufoundation.management.data.mysql.entity.user.CompanyEntity#1] - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:170) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
AbstractLazyInitializer.java:170
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:310) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
AbstractLazyInitializer.java:310
at org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor.intercept(ByteBuddyInterceptor.java:45) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
ByteBuddyInterceptor.java:45
at org.hibernate.proxy.ProxyConfiguration$InterceptorDispatcher.intercept(ProxyConfiguration.java:95) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
ProxyConfiguration.java:95
at com.ahurufoundation.management.data.mysql.entity.user.CompanyEntity$HibernateProxy$FN6IM1Ba.getName(Unknown Source) ~[main/:na]
at com.ahurufoundation.management.auth.UserDetailsServiceImpl.loadUserByUsername(UserDetailsServiceImpl.java:33) ~[main/:na]
UserDetailsServiceImpl.java:33
at org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:93) ~[spring-security-core-5.4.5.jar:5.4.5]
DaoAuthenticationProvider.java:93
在多对一关系中需要指定引用的列名：
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "company_id", referencedColumnName = "id")
private CompanyEntity company; //can not extract data
就像您在联接 sql 查询中所做的那样
还要确保每当您尝试从 UserEntity 对象访问公司字段时，您都有一个打开的会话（您处于事务上下文中），因为它是延迟加载的（仅在访问时加载）
请注意，除非您调用：userEntity.getCompany() 公司对象将不会被初始化，这就是延迟加载的意思。它仅在访问时从数据库加载对象。
而且最重要的是！您需要在事务上下文中调用 userEntity.getCompany() 以便您有一个打开的会话（注释查找用户并使用 @Transactional 调用 getter 的方法）
示例（错误）：
@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserEntity user = userRepository.findByUsername(username);
// the call to user.getCompany() will throw the same error because as soon as the
// findByUsername returns the session is closed
CompanyEntity company = user.getCompany();
}
此示例将抛出相同的错误，因为一旦 findByUsername returns 会话关闭。
例子（好）：
@Override
@Transactional
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserEntity user = userRepository.findByUsername(username);
CompanyEntity company = user.getCompany();
}
现在这里的会话只会在离开 loadUserByUsername 方法后关闭，所以在里面你会有一个活动会话
规则：每次你有一个懒惰的关联，如果你想能够加载它，你需要有一个打开的会话（事务开始时总是打开一个会话)
我正在为用户和公司创建两个table，多个用户可以属于一个公司，所以是多对一的关系。但是由于某些原因，company_id外键变量无法从公司table中提取数据（请看下面的截图）。我已经谷歌搜索了一段时间，但没有找到任何解决方案。非常感谢您的帮助。
UserEntity.java
@Entity(name = "Users")
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@SuperBuilder
public class UserEntity extends DateAudit {
private static final long serialVersionUID = -6622427995561357149L;
@Id
@GeneratedValue()
@Type(type = "uuid-char")
@Column(columnDefinition = "VARCHAR(36)", updatable = false, nullable = false)
private UUID id;
@Column(unique = true, nullable = false)
private String username;
@Column(nullable = false)
private String password;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "company_id")
private CompanyEntity company; //can not extract data
@OneToMany(mappedBy = "user", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private List<ItemEntity> safetyPlans; //but this works
}
CompanyEntity.java
@Entity(name = "Companies")
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@SuperBuilder
public class CompanyEntity extends DateAudit {
private static final long serialVersionUID = -6622427995561357151L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false)
private String name;
@Column(nullable = false)
private String companyId;
@OneToMany(mappedBy = "company", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private List<UserEntity> users;
}
UserRepository.java
public interface UserRepository extends CrudRepository<UserEntity, String>, IUserRepository {
Optional<UserEntity> findOneById(UUID id);
Optional<UserEntity> findByUsername(String username);
List<UserEntity> findAll();
}
服务class
@Service
public class UserDetailsServiceImpl implements UserDetailsService {
private UserRepository userRepository;
public UserDetailsServiceImpl(UserRepository userRepository) {
this.userRepository = userRepository;
}
@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserEntity entity = userRepository.findByUsername(username).orElseThrow(() -> new UsernameNotFoundException(username));
return new User(entity.getUsername(), entity.getPassword(), emptyList());
}
}
公司table
用户table
读取值时的错误日志（例如entity.getCompany().getName()）：
2021-09-10 17:29:02.747 ERROR 88245 --- [nio-5000-exec-1] c.a.m.auth.JWTAuthenticationFilter : An internal error occurred while trying to authenticate the user.
org.springframework.security.authentication.InternalAuthenticationServiceException: could not initialize proxy [com.ahurufoundation.management.data.mysql.entity.user.CompanyEntity#1] - no Session
at org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:108) ~[spring-security-core-5.4.5.jar:5.4.5]
DaoAuthenticationProvider.java:108
at org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:133) ~[spring-security-core-5.4.5.jar:5.4.5]
AbstractUserDetailsAuthenticationProvider.java:133
at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:182) ~[spring-security-core-5.4.5.jar:5.4.5]
ProviderManager.java:182
at com.ahurufoundation.management.auth.JWTAuthenticationFilter.attemptAuthentication(JWTAuthenticationFilter.java:41) ~[main/:na]
JWTAuthenticationFilter.java:41
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:222) [spring-security-web-5.4.5.jar:5.4.5]
AbstractAuthenticationProcessingFilter.java:222
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212) [spring-security-web-5.4.5.jar:5.4.5]
AbstractAuthenticationProcessingFilter.java:212
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103) [spring-security-web-5.4.5.jar:5.4.5]
LogoutFilter.java:103
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89) [spring-security-web-5.4.5.jar:5.4.5]
LogoutFilter.java:89
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91) [spring-web-5.3.4.jar:5.3.4]
CorsFilter.java:91
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) [spring-security-web-5.4.5.jar:5.4.5]
HeaderWriterFilter.java:90
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) [spring-security-web-5.4.5.jar:5.4.5]
HeaderWriterFilter.java:75
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110) [spring-security-web-5.4.5.jar:5.4.5]
SecurityContextPersistenceFilter.java:110
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80) [spring-security-web-5.4.5.jar:5.4.5]
SecurityContextPersistenceFilter.java:80
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55) [spring-security-web-5.4.5.jar:5.4.5]
WebAsyncManagerIntegrationFilter.java:55
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55) [spring-security-web-5.4.5.jar:5.4.5]
WebAsyncManagerIntegrationFilter.java:55
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:336
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211) [spring-security-web-5.4.5.jar:5.4.5]
FilterChainProxy.java:211
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183) [spring-security-web-5.4.5.jar:5.4.5]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) [spring-web-5.3.4.jar:5.3.4]
DelegatingFilterProxy.java:358
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) [spring-web-5.3.4.jar:5.3.4]
DelegatingFilterProxy.java:271
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.3.4.jar:5.3.4]
RequestContextFilter.java:100
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.3.4.jar:5.3.4]
FormContentFilter.java:93
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.3.4.jar:5.3.4]
CharacterEncodingFilter.java:201
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.4.jar:5.3.4]
OncePerRequestFilter.java:119
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:189
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [tomcat-embed-core-9.0.43.jar:9.0.43]
ApplicationFilterChain.java:162
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardWrapperValve.java:202
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardContextValve.java:97
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.43.jar:9.0.43]
AuthenticatorBase.java:542
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardHostValve.java:143
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.43.jar:9.0.43]
ErrorReportValve.java:92
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.43.jar:9.0.43]
StandardEngineValve.java:78
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) [tomcat-embed-core-9.0.43.jar:9.0.43]
CoyoteAdapter.java:346
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) [tomcat-embed-core-9.0.43.jar:9.0.43]
Http11Processor.java:374
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.43.jar:9.0.43]
AbstractProcessorLight.java:65
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) [tomcat-embed-core-9.0.43.jar:9.0.43]
AbstractProtocol.java:887
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) [tomcat-embed-core-9.0.43.jar:9.0.43]
NioEndpoint.java:1684
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.43.jar:9.0.43]
SocketProcessorBase.java:49
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_221]
ThreadPoolExecutor.java:1149
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_221]
ThreadPoolExecutor.java:624
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.43.jar:9.0.43]
TaskThread.java:61
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_221]
Thread.java:748
Caused by: org.hibernate.LazyInitializationException: could not initialize proxy [com.ahurufoundation.management.data.mysql.entity.user.CompanyEntity#1] - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:170) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
AbstractLazyInitializer.java:170
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:310) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
AbstractLazyInitializer.java:310
at org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor.intercept(ByteBuddyInterceptor.java:45) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
ByteBuddyInterceptor.java:45
at org.hibernate.proxy.ProxyConfiguration$InterceptorDispatcher.intercept(ProxyConfiguration.java:95) ~[hibernate-core-5.4.28.Final.jar:5.4.28.Final]
ProxyConfiguration.java:95
at com.ahurufoundation.management.data.mysql.entity.user.CompanyEntity$HibernateProxy$FN6IM1Ba.getName(Unknown Source) ~[main/:na]
at com.ahurufoundation.management.auth.UserDetailsServiceImpl.loadUserByUsername(UserDetailsServiceImpl.java:33) ~[main/:na]
UserDetailsServiceImpl.java:33
at org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:93) ~[spring-security-core-5.4.5.jar:5.4.5]
DaoAuthenticationProvider.java:93
在多对一关系中需要指定引用的列名：
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "company_id", referencedColumnName = "id")
private CompanyEntity company; //can not extract data
就像您在联接 sql 查询中所做的那样
还要确保每当您尝试从 UserEntity 对象访问公司字段时，您都有一个打开的会话（您处于事务上下文中），因为它是延迟加载的（仅在访问时加载）
请注意，除非您调用：userEntity.getCompany() 公司对象将不会被初始化，这就是延迟加载的意思。它仅在访问时从数据库加载对象。
而且最重要的是！您需要在事务上下文中调用 userEntity.getCompany() 以便您有一个打开的会话（注释查找用户并使用 @Transactional 调用 getter 的方法）
示例（错误）：
@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserEntity user = userRepository.findByUsername(username);
// the call to user.getCompany() will throw the same error because as soon as the
// findByUsername returns the session is closed
CompanyEntity company = user.getCompany();
}
此示例将抛出相同的错误，因为一旦 findByUsername returns 会话关闭。
例子（好）：
@Override
@Transactional
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserEntity user = userRepository.findByUsername(username);
CompanyEntity company = user.getCompany();
}
现在这里的会话只会在离开 loadUserByUsername 方法后关闭，所以在里面你会有一个活动会话
规则：每次你有一个懒惰的关联，如果你想能够加载它，你需要有一个打开的会话（事务开始时总是打开一个会话)