JpaRepository 连接问题，无法通过登录找到用户

Posted 2023-03-26

【中文标题】JpaRepository 连接问题，无法通过登录找到用户

【英文标题】：Problem with JpaRepository connection, cannot find a user by login

【发布时间】：2021-01-29 03:15:11

【问题描述】：

我做了一个简单的 crud 程序。 我使用过 Spring 审计 目前一切正常： 当我发布新的“库存”时没有问题，但是当我尝试更新它时，我收到了这个错误 我很久没见过 ***Error 问题是当我向我的数据库添加一个新对象时，它会通过登录到存储库中找到用户， 与班级：

public User findUserByLogin(String login)
        return userRepository.findByLogin(login);

public User getThisUser()
    return findUserByLogin(request.getUserPrincipal().getName());

存储库：

@Query("select u from User u where lower(u.login) = lower(?1) ")
User findByLogin(String login);

当我更新已经存在的对象时，它会抛出 null，并试图找到它卡住的东西。 我是不是忘记了什么？ 我不添加 DTO，我认为该类在这里没有问题。 （我认为:)）

@Entity
@EntityListeners(AuditingEntityListener.class)
public class Inventory extends BaseEntity

    @Embedded
    private EntityDescription entityDescription;
    private BigDecimal price;

    public EntityDescription getEntityDescription() 
        return entityDescription;
    

    public void setEntityDescription(EntityDescription entityDescription) 
        this.entityDescription = entityDescription;
    

    public BigDecimal getPrice() 
        return price;
    

    public void setPrice(BigDecimal price) 
        this.price = price;
    

基础实体：

@MappedSuperclass
public class BaseEntity extends AbstractAuditable<User, Long> 

    @Version
    private Long version;

    public Long getVersion() 
        return version;
    

    public void setVersion(Long version) 
        this.version = version;
    

    @Override
    public String toString() 
        return "BaseEntity" +
                "version=" + version +
                '';
    

@Service
public class UserService 

    private final HttpServletRequest request;
    private final UserRepository userRepository;
    private final UserRoleRepository userRoleRepository;

    public UserService(HttpServletRequest request,
                       UserRepository userRepository,
                       UserRoleRepository userRoleRepository) 
        this.request = request;
        this.userRepository = userRepository;
        this.userRoleRepository = userRoleRepository;
    

    public List<User> findAll()
        return userRepository.findAll();
    

    public User findUserByLogin(String login)
        return userRepository.findByLogin(login);
    

    public User getThisUser()
        return findUserByLogin(request.getUserPrincipal().getName());
    

@GetMapping("/inventory")
    public List<InventoryDTO> allInventory()
        return inventoryService.findAll();
    

    @PostMapping("/inventory")
    public InventoryDTO addInventory(@RequestBody InventoryDTO inventoryDTO)
        return inventoryService.add(inventoryDTO);
    

    @GetMapping("/inventory/id")
    public InventoryDTO getInventoryById(@PathVariable Long id)
        return inventoryService.findById(id);
    

    @DeleteMapping("/inventory/id")
    public List<InventoryDTO> deleteItem(@PathVariable Long id)
        inventoryService.remove(id);
        return inventoryService.findAll();
    

    @PostMapping("/inventory/id")
    public InventoryDTO updateInventory(@PathVariable Long id, @RequestBody InventoryDTO inventoryDTO)
        return inventoryService.update(id, inventoryDTO);
    

还有错误：

    java.lang.***Error: null
    at java.base/java.net.URL.<init>(URL.java:605) ~[na:na]
    at java.base/java.net.URL.<init>(URL.java:553) ~[na:na]
    at java.base/jdk.internal.loader.URLClassPath$FileLoader.getResource(URLClassPath.java:1222) ~[na:na]
    at java.base/jdk.internal.loader.URLClassPath.getResource(URLClassPath.java:317) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:718) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:644) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602) ~[na:na]
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
    at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016) ~[na:na]
    at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:823) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:721) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:644) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602) ~[na:na]
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
    at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1533) ~[hibernate-core-5.4.21.Final.jar:5.4.21.Final]
    at org.hibernate.query.internal.AbstractProducedQuery.getSingleResult(AbstractProducedQuery.java:1581) ~[hibernate-core-5.4.21.Final.jar:5.4.21.Final]
    at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:196) ~[spring-data-jpa-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:88) ~[spring-data-jpa-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:154) ~[spring-data-jpa-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:142) ~[spring-data-jpa-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor$QueryMethodInvoker.invoke(QueryExecutorMethodInterceptor.java:195) ~[spring-data-commons-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:152) ~[spring-data-commons-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:130) ~[spring-data-commons-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:367) ~[spring-tx-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118) ~[spring-tx-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:149) ~[spring-data-jpa-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at com.sun.proxy.$Proxy102.findByLogin(Unknown Source) ~[na:na]
    at com.teamcompetencymatrix.www.service.UserService.findUserByLogin(UserService.java:31) ~[classes/:na]
    at com.teamcompetencymatrix.www.service.UserService.getThisUser(UserService.java:35) ~[classes/:na]
    at com.teamcompetencymatrix.www.config.AuditorAwareImpl.getCurrentAuditor(AuditorAwareImpl.java:24) ~[classes/:na]
    at org.springframework.data.auditing.AuditingHandler.lambda$touchAuditor$6(AuditingHandler.java:193) ~[spring-data-commons-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at java.base/java.util.Optional.map(Optional.java:258) ~[na:na]
    at org.springframework.data.auditing.AuditingHandler.touchAuditor(AuditingHandler.java:191) ~[spring-data-commons-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at org.springframework.data.auditing.AuditingHandler.lambda$touch$0(AuditingHandler.java:165) ~[spring-data-commons-2.3.4.RELEASE.jar:2.3.4.RELEASE]
    at java.base/java.util.Optional.map(Optional.java:258) ~[na:na]

【参考方案1】：

解决方案在 UserRepository 中

我添加了@Transactional注解

问题在于寻找审计师。 这是交易的问题，所以制作一个新的解决了这个问题。

@Transactional(propagation = Propagation.REQUIRES_NEW)
@Query("select u from User u where lower(u.login) = lower(?1) ")
User findAuditorByLogin(String login);

这是一个可行的解决方案，但也许还有更好的解决方案。