org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.example.domain.AuthorEntity.books, could not initialize proxy - no Session

Spring JIRA | Gavin Foley | 2 years ago
  1. 0

    I've got a small project for getting to know Spring Data REST. It contains two entities ({{BookEntity}} and {{AuthorEntity}}) and two corresponding repositories ({{BookRepository}} and {{AuthorRepository}}). There's a many-to-many relationship between {{BookEntity}} and {{AuthorEntity}}, but {{BookEntity.authors}} has {{FetchType.EAGER}} while {{AuthorEntity.books}} has {{FetchType.LAZY}}. I created one book and one author, but did not link them together, so both associated collections should be empty. Navigating to /books/1/authors returns an empty set, which is the desired result. Navigating to /authors/1/books throws this exception: {quote} org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.example.domain.AuthorEntity.books, could not initialize proxy - no Session at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:575) at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:214) at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:554) at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:142) at org.hibernate.collection.internal.PersistentSet.iterator(PersistentSet.java:180) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController$1.apply(RepositoryPropertyReferenceController.java:127) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController$1.apply(RepositoryPropertyReferenceController.java:114) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.doWithReferencedProperty(RepositoryPropertyReferenceController.java:473) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReference(RepositoryPropertyReferenceController.java:152) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659) at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) {quote} {code:title=BookEntity.groovy} @Entity(name = 'book') @EqualsAndHashCode class BookEntity { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) long id @Column(nullable = false) String title @Column(nullable = false) String isbn @Column(nullable = false) String publisher @ManyToMany(fetch = FetchType.EAGER, cascade = [CascadeType.ALL]) @JoinTable(name = 'books_authors', joinColumns = @JoinColumn(name = 'book_id'), inverseJoinColumns = @JoinColumn(name = 'author_id')) Set<AuthorEntity> authors } {code} {code:title=AuthorEntity.groovy} @Entity(name = 'author') @EqualsAndHashCode class AuthorEntity { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) long id @Column(nullable = false, unique = true) String fullName @ManyToMany(mappedBy = "authors") Set<BookEntity> books } {code} {code:title=BookRepository.groovy} @RepositoryRestResource(collectionResourceRel = "books", path = "books") interface BookRepository extends CrudRepository<BookEntity, Long> {} {code} {code:title=AuthorRepository.groovy} @RepositoryRestResource(collectionResourceRel = "authors", path = "authors") interface AuthorRepository extends CrudRepository<AuthorEntity, Long> {} {code}

    Spring JIRA | 2 years ago | Gavin Foley
    org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.example.domain.AuthorEntity.books, could not initialize proxy - no Session
  2. 0

    I've got a small project for getting to know Spring Data REST. It contains two entities ({{BookEntity}} and {{AuthorEntity}}) and two corresponding repositories ({{BookRepository}} and {{AuthorRepository}}). There's a many-to-many relationship between {{BookEntity}} and {{AuthorEntity}}, but {{BookEntity.authors}} has {{FetchType.EAGER}} while {{AuthorEntity.books}} has {{FetchType.LAZY}}. I created one book and one author, but did not link them together, so both associated collections should be empty. Navigating to /books/1/authors returns an empty set, which is the desired result. Navigating to /authors/1/books throws this exception: {quote} org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.example.domain.AuthorEntity.books, could not initialize proxy - no Session at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:575) at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:214) at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:554) at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:142) at org.hibernate.collection.internal.PersistentSet.iterator(PersistentSet.java:180) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController$1.apply(RepositoryPropertyReferenceController.java:127) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController$1.apply(RepositoryPropertyReferenceController.java:114) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.doWithReferencedProperty(RepositoryPropertyReferenceController.java:473) at org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReference(RepositoryPropertyReferenceController.java:152) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659) at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) {quote} {code:title=BookEntity.groovy} @Entity(name = 'book') @EqualsAndHashCode class BookEntity { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) long id @Column(nullable = false) String title @Column(nullable = false) String isbn @Column(nullable = false) String publisher @ManyToMany(fetch = FetchType.EAGER, cascade = [CascadeType.ALL]) @JoinTable(name = 'books_authors', joinColumns = @JoinColumn(name = 'book_id'), inverseJoinColumns = @JoinColumn(name = 'author_id')) Set<AuthorEntity> authors } {code} {code:title=AuthorEntity.groovy} @Entity(name = 'author') @EqualsAndHashCode class AuthorEntity { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) long id @Column(nullable = false, unique = true) String fullName @ManyToMany(mappedBy = "authors") Set<BookEntity> books } {code} {code:title=BookRepository.groovy} @RepositoryRestResource(collectionResourceRel = "books", path = "books") interface BookRepository extends CrudRepository<BookEntity, Long> {} {code} {code:title=AuthorRepository.groovy} @RepositoryRestResource(collectionResourceRel = "authors", path = "authors") interface AuthorRepository extends CrudRepository<AuthorEntity, Long> {} {code}

    Spring JIRA | 2 years ago | Gavin Foley
    org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.example.domain.AuthorEntity.books, could not initialize proxy - no Session
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Root Cause Analysis

  1. org.hibernate.LazyInitializationException

    failed to lazily initialize a collection of role: com.example.domain.AuthorEntity.books, could not initialize proxy - no Session

    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException()
  2. Hibernate
    PersistentSet.iterator
    1. org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:575)
    2. org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:214)
    3. org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:554)
    4. org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:142)
    5. org.hibernate.collection.internal.PersistentSet.iterator(PersistentSet.java:180)
    5 frames
  3. Spring Data REST - WebMVC
    RepositoryPropertyReferenceController.followPropertyReference
    1. org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController$1.apply(RepositoryPropertyReferenceController.java:127)
    2. org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController$1.apply(RepositoryPropertyReferenceController.java:114)
    3. org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.doWithReferencedProperty(RepositoryPropertyReferenceController.java:473)
    4. org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReference(RepositoryPropertyReferenceController.java:152)
    4 frames
  4. Java RT
    Method.invoke
    1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    4. java.lang.reflect.Method.invoke(Method.java:497)
    4 frames
  5. Spring
    InvocableHandlerMethod.invokeForRequest
    1. org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
    2. org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
    2 frames
  6. Spring MVC
    FrameworkServlet.doGet
    1. org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    2. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
    3. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
    4. org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    5. org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    6. org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    7. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    8. org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    8 frames
  7. JavaServlet
    HttpServlet.service
    1. javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    1 frame
  8. Spring MVC
    FrameworkServlet.service
    1. org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    1 frame
  9. JavaServlet
    HttpServlet.service
    1. javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    1 frame
  10. Glassfish Core
    ApplicationFilterChain.doFilter
    1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    2 frames
  11. Tomcat WS
    WsFilter.doFilter
    1. org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    1 frame
  12. Glassfish Core
    ApplicationFilterChain.doFilter
    1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    2 frames
  13. Spring
    OncePerRequestFilter.doFilter
    1. org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    2. org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    2 frames
  14. Glassfish Core
    ApplicationFilterChain.doFilter
    1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    2 frames
  15. Spring
    OncePerRequestFilter.doFilter
    1. org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    2. org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    2 frames
  16. Glassfish Core
    CoyoteAdapter.service
    1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    3. org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    4. org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    5. org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    6. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    7. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    8. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    9. org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
    9 frames
  17. Grizzly HTTP
    NioEndpoint$SocketProcessor.run
    1. org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086)
    2. org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659)
    3. org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
    4. org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558)
    5. org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515)
    5 frames
  18. Java RT
    ThreadPoolExecutor$Worker.run
    1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    2 frames
  19. Tomcat Util
    TaskThread$WrappingRunnable.run
    1. org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    1 frame
  20. Java RT
    Thread.run
    1. java.lang.Thread.run(Thread.java:745)
    1 frame