Eh bien, j'ai cherché sur Google et trouvé de nombreux résultats, mais aucun d'entre eux n'a pu répondre à mon problème. Alors, voilà.
J'essaie d'étudier Spring MVC et Spring Data JPA en faisant une implémentation minimale du clone pinterest. Voici donc les parties de code qui, à mon avis, sont pertinentes pour mon problème.
Modèles / Entités
@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...
}
Un service
@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
}
Dépôt
public interface UserBoardRepository extends JpaRepository<UserBoard, Integer> {
}
Maintenant, lorsque j'appelle la findLatestBoards
méthode BoardService
, l'exception "Aucune propriété trouvée" est lancée sur la ligne return boardRepository.findAll(request).getContent();
. Voici l'extrait du journal tomcat.
JOURNAL DE DÉBOGAGE
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
Exception
L'exception est " org.springframework.data.mapping.PropertyReferenceException: No property board found for type com.tecnooc.picpin.model.UserBoard
". Mais, si j'ai bien compris, la propriété board
est présente dans PinItem
et est correctement mappée avec mappedBy = "board"
in 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)
Je ne comprends pas pourquoi cette exception est levée. Une idée de pourquoi cela se produit?
Remarque: j'utilise Hibernate comme fournisseur de persistance. En outre, la partie de code que j'ai mise ici est ce que je pensais être pertinente pour le problème. Si ce n'est pas le cas, faites-le moi savoir et je mettrai à jour la question avec la partie requise.