Jom*_*oos 110 java jpa spring-data-jpa
好吧,我搜索谷歌并找到了很多结果,但没有一个能够回答我的问题.所以,在这里.
我试图通过最小的pinterest clone实现来研究Spring MVC和Spring Data JPA.因此,以下是我认为与我的问题相关的代码部分.
型号/实体
@Entity
@Table(name = "pin_item")
public class PinItem implements Serializable {
// properties ...
@JoinColumn(name = "board_id", referencedColumnName = "user_board_id")
@ManyToOne(optional = false)
private UserBoard board;
// getters and setters...
}
@Entity
@Table(name = "user_board")
public class UserBoard implements Serializable {
// properties ...
@OneToMany(cascade = CascadeType.ALL, mappedBy = "board")
private List<PinItem> pinItemList;
// getters and setters...
}
服务
@Service
@Transactional(readOnly = true)
public class BoardServiceImpl implements BoardService {
@Autowired
private UserBoardRepository boardRepository;
@Override
public List<UserBoard> findLatestBoards() {
PageRequest request = new PageRequest(
0, PresentationUtil.PAGE_SIZE,
Sort.Direction.DESC, "boardId"
);
return boardRepository.findAll(request).getContent();
}
// Other Methods
}
知识库
public interface UserBoardRepository extends JpaRepository<UserBoard, Integer> {
}
现在,当我调用该findLatestBoards方法时BoardService,行中会抛出"No Property Found"异常return boardRepository.findAll(request).getContent();.这是tomcat日志的摘录.
调试日志
12:28:44,254 DEBUG AnnotationTransactionAttributeSource:106 - Adding transactional method 'findLatestBoards' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; ''
12:28:44,254 DEBUG DefaultListableBeanFactory:246 - Returning cached instance of singleton bean 'transactionManager'
12:28:44,254 DEBUG JpaTransactionManager:366 - Creating new transaction with name [com.tecnooc.picpin.service.impl.BoardServiceImpl.findLatestBoards]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; ''
12:28:44,254 DEBUG JpaTransactionManager:369 - Opened new EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] for JPA transaction
12:28:44,255 DEBUG AbstractTransactionImpl:158 - begin
12:28:44,255 DEBUG LogicalConnectionImpl:212 - Obtaining JDBC connection
12:28:44,255 DEBUG DriverManagerDataSource:162 - Creating new JDBC DriverManager Connection to [jdbc:mysql://localhost:3306/pic_pin]
12:28:44,266 DEBUG LogicalConnectionImpl:218 - Obtained JDBC connection
12:28:44,267 DEBUG JdbcTransaction:69 - initial autocommit status: true
12:28:44,267 DEBUG JdbcTransaction:71 - disabling autocommit
12:28:44,267 DEBUG JpaTransactionManager:401 - Exposing JPA transaction as JDBC transaction [org.springframework.orm.jpa.vendor.HibernateJpaDialect$HibernateConnectionHandle@370da60e]
12:28:44,274 DEBUG TransactionalRepositoryProxyPostProcessor$CustomAnnotationTransactionAttributeSource:286 - Adding transactional method 'findAll' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; ''
12:28:44,274 DEBUG DefaultListableBeanFactory:246 - Returning cached instance of singleton bean 'transactionManager'
12:28:44,274 DEBUG JpaTransactionManager:332 - Found thread-bound EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] for JPA transaction
12:28:44,274 DEBUG JpaTransactionManager:471 - Participating in existing transaction
12:28:44,279 DEBUG CachedIntrospectionResults:159 - Not strongly caching class [java.io.Serializable] because it is not cache-safe
12:28:44,281 DEBUG JpaTransactionManager:851 - Participating transaction failed - marking existing transaction as rollback-only
12:28:44,281 DEBUG JpaTransactionManager:559 - Setting JPA transaction on EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] rollback-only
12:28:44,283 DEBUG JpaTransactionManager:844 - Initiating transaction rollback
12:28:44,284 DEBUG JpaTransactionManager:534 - Rolling back JPA transaction on EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194]
12:28:44,284 DEBUG AbstractTransactionImpl:203 - rolling back
12:28:44,284 DEBUG JdbcTransaction:164 - rolled JDBC Connection
12:28:44,285 DEBUG JdbcTransaction:126 - re-enabling autocommit
12:28:44,285 DEBUG JpaTransactionManager:594 - Closing JPA EntityManager [org.hibernate.ejb.EntityManagerImpl@75284194] after transaction
12:28:44,285 DEBUG EntityManagerFactoryUtils:338 - Closing JPA EntityManager
12:28:44,286 DEBUG LogicalConnectionImpl:232 - Releasing JDBC connection
12:28:44,286 DEBUG LogicalConnectionImpl:250 - Released JDBC connection
12:28:44,287 DEBUG ExceptionHandlerExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.tecnooc.picpin.controller.BoardController.latest(javax.servlet.http.HttpSession,org.springframework.ui.Model)]: org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
12:28:44,289 DEBUG ResponseStatusExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.tecnooc.picpin.controller.BoardController.latest(javax.servlet.http.HttpSession,org.springframework.ui.Model)]: org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
12:28:44,290 DEBUG DefaultHandlerExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.tecnooc.picpin.controller.BoardController.latest(javax.servlet.http.HttpSession,org.springframework.ui.Model)]: org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
12:28:44,291 DEBUG DispatcherServlet:959 - Could not complete request
例外
例外是" org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard".但是,如果我理解正确,该属性board存在于PinItem并正确映射mappedBy = "board"到UserBoard.
org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:75)
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:327)
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:353)
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:307)
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:271)
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:245)
at org.springframework.data.jpa.repository.query.QueryUtils.toJpaOrder(QueryUtils.java:408)
at org.springframework.data.jpa.repository.query.QueryUtils.toOrders(QueryUtils.java:372)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:456)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:437)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:319)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:289)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:333)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.data.jpa.repository.support.LockModeRepositoryPostProcessor$LockModePopulatingMethodIntercceptor.invoke(LockModeRepositoryPostProcessor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy147.findAll(Unknown Source)
at com.tecnooc.picpin.service.impl.BoardServiceImpl.findLatestBoards(BoardServiceImpl.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy148.findLatestBoards(Unknown Source)
at com.tecnooc.picpin.controller.BoardController.latest(BoardController.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
我不明白为什么抛出这个异常.知道为什么会这样吗？
注意:我使用Hibernate作为持久性提供程序.此外,我放在这里的代码部分是我认为与问题相关的.如果不是,请告诉我,我将以所需部分更新问题.
Ala*_*Dee 122
我遇到了同样的问题并在此处找到了解决方案:http://java.dzone.com/articles/persistence-layer-spring-data
我重命名了一个实体属性.但是使用Springs Automatic Custom Queries有一个为旧属性名定义的接口.
public interface IFooDAO extends JpaRepository< Foo, Long >{
Foo findByOldPropName( final String name );
}
该错误表明它无法再找到"OldPropName"并抛出异常.
引用DZone上的文章:
当Spring Data创建新的Repository实现时,它会分析接口定义的所有方法,并尝试从方法名称自动生成查询.虽然这有局限性,但它是一种非常强大而优雅的方法,可以轻松定义新的自定义访问方法.例如,如果托管实体具有名称字段(以及该字段的Java Bean标准getter和setter),则在DAO接口中定义findByName方法将自动生成正确的查询:
public interface IFooDAO extends JpaRepository< Foo, Long >{
Foo findByName( final String name );
}
这是一个相对简单的例子; 查询创建机制支持更大的关键字集.
如果解析器无法将该属性与域对象字段匹配,则抛出以下异常:
java.lang.IllegalArgumentException: No property nam found for type class org.rest.model.Foo
Kum*_*hek 39
修复了,在使用CrudRepositorySpring时,我们必须在findBy之后正确附加属性名,否则会给你异常
"No Type Found for Type"
我得到了这个例外.因为属性名称和方法名称不同步.
我使用下面的代码进行数据库访问.
public interface UserDao extends CrudRepository<User, Long> {
User findByUsername(String username);
我的域用户有财产.
@Entity
public class User implements UserDetails {
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "userId", nullable = false, updatable = false)
private Long userId;
private String username;
Abh*_*ash 26
由于您的JPA存储库名称是UserBoardRepository,您的自定义接口名称应为UserBoardRepositoryCustom(它应以'Custom'结尾),您的实现类名称应为UserBoardRepositoryImpl(应以Impl结尾;您可以使用存储库以不同的后缀设置它)impl-postfix属性)
oak*_*oak 16
如果您尝试访问不存在的属性,则会发生此错误
我的猜测是,排序是由春天property name而不是通过real column name.并且错误表明,"UserBoard"没有名为的属性"boardId".
最好成绩,
橡木
小智 9
就我而言，我在创建 PageRequest 对象时使用了错误的列名称进行排序。
PageRequest paging = PageRequest.of(page, 30, Sort.by("column_name"));
正确的语法是
PageRequest paging = PageRequest.of(page, 30, Sort.by("columnName"));
Spring 给出错误“未找到类型列的属性”。我正在查看存储库和实体，但没有找到任何内容。错误发生在我创建 PageRequest 对象的控制器上。
因此，当您使用错误的语义时，会引发错误，但您不一定只在存储库中犯了错误。
在我的情况下，我的方法名称中有一个错字（驼峰式的情况）。我将其命名为“ findbyLastName”，并遇到此异常。在将其更改为“ findByLastName”之后，异常消失了。
此处尚未提及的导致此错误的另一种情况是，当从 Swagger 调用 API 时，API 会接收Pageable（或Sort）并将其按原样传递到 JPA 存储库。
SwaggerPageable参数的默认值是这样的：
{
"page": 0,
"size": 0,
"sort": [
"string"
]
}
请注意，"string"there 是一个确实存在的属性。运行 API 而不删除或更改它会导致org.springframework.data.mapping.PropertyReferenceException: No property string found for type ...
在这里注意：Zane XY和Alan B. Dee的答案非常好。但是对于那些现在将使用Spring Boot和Spring Data的人来说，这是一个更现代的答案。
假设您有一个类，例如：
@Entity
class MyClass {
@Id
@GeneratedValue
private Long id;
private String myClassName;
}
现在JpaRepository，这看起来像
interface MyClassRepository extends JpaRepository {
Collection<MyClass> findByMyClassName(String myClassName);
}
现在，您的“自定义” 方法查找必须Collection<MyClass> findByMyClassName(String myClassName)准确拼写，因为Spring需要某种机制来将此方法映射到MyClass属性上myClassName！
我想通了这一点，因为对我来说，这似乎是自然的找到其名称的类 语义，而实际上，synatxically你通过myClassName找到
干杯
在 JPA 中，关系有一个所有者，通过mappedBy在UserBoard类中使用，您可以得知该PinItem所有者是该双向关系的所有者，并且该关系的属性PinItem名为board。
在您的UserBoard类中，您没有任何名为 name 的字段/属性board，但它有一个 property pinItemList，因此您可以尝试使用该属性。
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