Impossibile inizializzare lentamente una raccolta .. nessuna sessione o sessione è stata chiusa

Non so cos'altro provare, ho aggiornato a Jackson 2, modificato in Lazy, utilizzato @JsonIgnore ... ma non è stato risolto nulla. Qualche idea di cosa può essere?Impossibile inizializzare lentamente una raccolta .. nessuna sessione o sessione è stata chiusa

Ambiente

Spring MVC 3.2.5
Jackson 2.2
Hibernate 3.5.4

ERRORE Estado HTTP 500 - Impossibile scrivere JSON: fallito inizializzare pigramente una raccolta di ruoli: com.javalabs.web.dao.Task.actions, no sessi on o session è stata chiusa (tramite la catena di riferimenti: java.util.HashMap ["actions"] -> java.util.ArrayList [0] -> com.javalabs.web.dao.TaskAction ["task"] -> com. javalabs.web.dao.Task [ "azioni"]); l'eccezione nidificata è com.fasterxml.jackson.databind.JsonMappingException: impossibile inizializzare in modo lasso un insieme di ruoli: com.javalabs.web.dao.Task.actions, nessuna sessione o sessione è stata chiusa (tramite la catena di riferimenti: java.util.HashMap ["actions"] -> java.util.ArrayList [0] -> com.javalabs.web.dao.TaskAction ["task"] -> com.javalabs.web.dao.Task ["actions"])

Errore traccia

org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: failed to lazily initialize a collection of role: com.javalabs.web.dao.Task.actions, no session or session was closed (through reference chain: java.util.HashMap["actions"]->java.util.ArrayList[0]->com.javalabs.web.dao.TaskAction["task"]->com.javalabs.web.dao.Task["actions"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: failed to lazily initialize a collection of role: com.javalabs.web.dao.Task.actions, no session or session was closed (through reference chain: java.util.HashMap["actions"]->java.util.ArrayList[0]->com.javalabs.web.dao.TaskAction["task"]->com.javalabs.web.dao.Task["actions"]) 
org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:207) 
org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179) 
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148) 
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90) 
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189) 
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69) 
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) 
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:620) 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343) 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260) 
causa raíz 

com.fasterxml.jackson.databind.JsonMappingException: failed to lazily initialize a collection of role: com.javalabs.web.dao.Task.actions, no session or session was closed (through reference chain: java.util.HashMap["actions"]->java.util.ArrayList[0]->com.javalabs.web.dao.TaskAction["task"]->com.javalabs.web.dao.Task["actions"]) 
com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:232) 
com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:197) 
com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:184) 
com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:605) 
com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:142) 
com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:569) 
com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:597) 
com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:142) 
com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:100) 
com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:21) 
com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:186) 
com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:394) 
com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:315) 
com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:27) 
com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:118) 
com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1819) 
org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:204) 
org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179) 
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148) 
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90) 
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189) 
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69) 
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) 
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:620) 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343) 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260) 
causa raíz 

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.javalabs.web.dao.Task.actions, no session or session was closed 
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383) 
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375) 
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368) 
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111) 
org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:272) 
com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:90) 
com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23) 
com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:186) 
com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:569) 
com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:597) 
com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:142) 
com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:569) 
com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:597) 
com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:142) 
com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:100) 
com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:21) 
com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:186) 
com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:394) 
com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:315) 
com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:27) 
com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:118) 
com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1819) 
org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:204) 
org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179) 
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148) 
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90) 
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189) 
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69) 
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) 
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:620) 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343) 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)

MODELLO

enter image description here

TaskController.java

@Controller 
public class TaskController { 

... 

    @RequestMapping(value = "/getactions/{id}", method = RequestMethod.GET, produces = "application/json") 
    public @ResponseBody Map<String, Object> getActions(Principal principal, 
      @PathVariable Long id) { 
     logger.info("Task controller get actions..."); 

     List<TaskAction> actions = null; 

     if (principal == null) { 
      actions = new ArrayList<TaskAction>(); 
     } else { 
      actions = taskActionService.getAllTaskActions(id); 
     } 

     Map<String, Object> data = new HashMap<String, Object>(); 
     data.put("actions", actions); 
     data.put("number", actions.size()); 

     return data; 
    } 
}

Task.java

@Entity 
@Table(name = "t_task") 
public class Task { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "idTask") 
    private long idTask; 
    @Size(min = 5, max = 100) 
    @Column(name = "taskname") 
    private String taskname; 
    ... 
    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "task", orphanRemoval = true) 
    private List<TaskAction> actions = new ArrayList<TaskAction>(); 
    @Column(name = "timestamp") 
    private Timestamp timestamp; 
... 
}

User.java @Entity @Table (name = "t_user") public class User {

@Id 
@GeneratedValue(strategy=GenerationType.AUTO) 
@Column(name = "idUser") 
private long idUser; 

... 

@ManyToMany(cascade = { CascadeType.ALL }) 
@JsonIgnore 
@JoinTable(name = "r_userrole", joinColumns = { @JoinColumn(name = "idUser") }, inverseJoinColumns = { @JoinColumn(name = "idRole") }) 
private Set<Role> roles = new HashSet<Role>();

...}

TaskAction.java

@Entity 
@Table(name = "t_taskaction") 
public class TaskAction { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "idTaskAction") 
    private long idTaskAction; 
    @ManyToOne 
    @JoinColumn(name = "idTask", nullable = false) 
    private Task task; 
    ... 
    @ManyToOne(fetch = FetchType.LAZY) 
    @JoinColumn(name = "idUser", nullable = false) 
    private User user; 
    @Column(name = "timestamp") 
    private Date timestamp; 
    ... 
}

TaskActionDao.java

@Repository 
@Transactional 
@Component("taskActionDao") 
public class TaskActionDao { 

    @Autowired 
    private SessionFactory sessionFactory; 

    public Session session() { 
     return sessionFactory.getCurrentSession(); 
    } 

    ... 

    @SuppressWarnings("unchecked") 
    public List<TaskAction> getAllTaskActions() { 
     Query q = session().createQuery("from TaskAction"); 
     List<TaskAction> la = q.list(); 
     //createQuery("from TaskAction").list(); 
     System.out.println(">>>>>>>>>>getAllActions>>>>>>>>>>> " + la.size()); 
     return la; 
    } 

    @SuppressWarnings("unchecked") 
    public List<TaskAction> getAllTaskActions(long idTask) { 
     Criteria crit = session().createCriteria(TaskAction.class); 
     crit.add(Restrictions.eq("task.idTask", idTask)); 
     System.out.println(">>>>>>>>getAllActions(id)>>>>>>>>>>>>> " + crit.list().size()); 
     return crit.list(); 
    } 
}

fonte

2014-09-08 Joe

Che dire TaskAction.java? – maszter

Scusa, l'avevo dimenticato. – Joe

Pugno di tutto, non abbiamo bisogno User.java a tutto qui. Non ha niente a che fare. Il problema è correlato a Task.actions. Si carica la raccolta di TaskAction, TaskAction ha Task e questa attività ha una raccolta di TaskAction che non può essere inizializzata.È possibile aggiungere @JsonIgnore a:

private List<TaskAction> actions = new ArrayList<TaskAction>(); //Task class

oppure a:

private Task task; //TaskAction class

Potete anche provare con il cambiamento FetchType.LAZY-FetchType.EAGER per la raccolta di azioni in Task.java, però io non sono sicuro che sta andando a lavoro (riferimenti circolari)

fonte

2014-09-08 22:01:41 maszter

Grazie per la tua risposta. Ho provato con @JsonIgnore ha funzionato, ma ho bisogno di informazioni sulle azioni, e con FetchType.EAGER ho avuto troppe informazioni, che non ho bisogno e non so da dove provenga. – Joe

Ora sto provando con @JsonIdentityInfo, è un modo per gestire i riferimenti circolari. – Joe

Prova anche con @JsonIgnoreProperties. – Shamseer

Recentemente ho riscontrato un problema simile: Jackson versione 1.9 e inferiore con relazioni birionali (evitando cicli)

E la soluzione sembra l'aggiornamento a Jackson 2.0, e aggiungere alle classi la seguente annotazione:

@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, 
        property = "idTaskAction") 
public class TaskAction

More info

fonte

2014-09-09 20:01:07 Joe

Ho avuto un problema che mostra l'eccezione stessa di cui sopra, che lamentano la 'no session' ma ho scoperto che il problema era dovuto all'entità a cui si fa riferimento nel DTO piuttosto che al suo ID. Quindi, nel caso in cui si verifichi il problema sopra suggerirò di verificare se uno non ha causato alcun problema di serializzazione.

fonte

2015-08-12 14:25:23 Yoku

Dal momento che si sta accedendo il tuo oggetto al di fuori dell'oggetto di Hibernate Session, così si dovrebbe aggiungere il @JsonIgnore annotazione prima di ogni annotazione @OneToMany nel modello

fonte

2016-02-26 15:06:26

ha funzionato.grazie – gaurav

Si prega di aggiungere annotazioni @JsonIgnore prima di ogni annotazione @OneToMany in voi entità classe La mia soluzione

@JsonIgnore 
@OneToMany(cascade = CascadeType.ALL, mappedBy = "domainDataId")

Grazie Shahid Hussain Abbasi

fonte

2018-02-12 18:23:04

ha funzionato..grazie – gaurav

Impossibile inizializzare lentamente una raccolta .. nessuna sessione o sessione è stata chiusa

risposta

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