Initialiser les collections paresseuses

Je développe une application Web Struts2 + Spring + Hibernate et je dois initialiser une collection paresseuse après avoir récupéré un object ou une collection de cet object.

Cas d’utilisation

J’ai un modèle d’ équipe avec une relation chargée d’ employés (je pense qu’il est évident qu’il s’agit d’une collection). À son tour, le modèle d’ employé a un registre de relations paresseux dont j’ai besoin uniquement pour des actions spécifiques, de sorte que je n’ai pas besoin du tout de le charger rapidement.

À présent. J’appelle mon teamService (injecté dans mon contrôleur Struts2 avec Spring) afin de récupérer un teamItem spécifique teamItem lequel ses employés de collecte ont déjà été chargés. Il est maintenant temps de charger pour chaque employé sa relation de registre.

• Stratégies de chargement paresseux / désagréable dans les cas distants (JPA)
• org.hibernate.LazyInitializationException: impossible d’initialiser le proxy – pas de session
• Hibernate: @ManyToOne (fetch = FetchType.LAZY) ne fonctionne pas sur la colonne référencée par la clé non primaire
• Chargement paresseux ne fonctionne pas correctement
• Spring, @Transactional et Hibernate Lazy Chargement

À l’aide de employeeService (également injecté dans mon contrôleur Struts2 avec Spring), j’appelle la méthode initializeCollections() de son DAO qui devrait charger l’appel de collecte paresseux.

 Hibernate.initialize(employee.getRegistry()); 

Lorsque j’exécute cette action, une org.hibernate.LazyInitializationException: could not initialize proxy - no Session exception de org.hibernate.LazyInitializationException: could not initialize proxy - no Session n’est levée.

trace de la stack:

 at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:167) ~[hibernate-core-3.6.10.Final.jar:3.6.10.Final] at org.hibernate.Hibernate.initialize(Hibernate.java:414) ~[hibernate-core-3.6.10.Final.jar:3.6.10.Final] at web.bkgd.simba.dao.registry.RegistryEmployeeDAO.initializeCollections(RegistryEmployeeDAO.java:438) ~[RegistryEmployeeDAO.class:?] at web.bkgd.simba.service.abstractions.BaseService.initializeCollections(BaseService.java:142) ~[BaseService.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79] at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79] at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.1.0.RELEASE.jar:4.1.0.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.1.0.RELEASE.jar:4.1.0.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.1.0.RELEASE.jar:4.1.0.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) ~[spring-tx-4.1.0.RELEASE.jar:4.1.0.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:266) ~[spring-tx-4.1.0.RELEASE.jar:4.1.0.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) ~[spring-tx-4.1.0.RELEASE.jar:4.1.0.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.0.RELEASE.jar:4.1.0.RELEASE] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) ~[spring-aop-4.1.0.RELEASE.jar:4.1.0.RELEASE] at com.sun.proxy.$Proxy1302.initializeCollections(Unknown Source) ~[?:?] at web.bkgd.simba.controller.ajax.agenda.TeamController.doSomething(TeamController.java:177) ~[AjaxTeamController.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79] at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79] at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870) ~[ognl-3.0.6.jar:?] at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293) ~[ognl-3.0.6.jar:?] at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68) ~[ognl-3.0.6.jar:?] at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369) ~[ognl-3.0.6.jar:?] at ognl.ASTMethod.getValueBody(ASTMethod.java:90) ~[ognl-3.0.6.jar:?] at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) ~[ognl-3.0.6.jar:?] at ognl.SimpleNode.getValue(SimpleNode.java:258) ~[ognl-3.0.6.jar:?] at ognl.Ognl.getValue(Ognl.java:494) ~[ognl-3.0.6.jar:?] at ognl.Ognl.getValue(Ognl.java:458) ~[ognl-3.0.6.jar:?] at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.ognl.OgnlUtil.comstackAndExecute(OgnlUtil.java:340) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at web.bkgd.simba.utility.interceptors.SessionCleanInterceptor.intercept(SessionCleanInterceptor.java:86) ~[SessionCleanInterceptor.class:?] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) ~[struts2-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) ~[xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) [xwork-core-2.3.24.1.jar:2.3.24.1] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) [xwork-core-2.3.24.1.jar:2.3.24.1] at web.bkgd.simba.utility.interceptors.LoginInterceptor.intercept(LoginInterceptor.java:113) [LoginInterceptor.class:?] at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) [xwork-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) [struts2-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564) [struts2-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81) [struts2-core-2.3.24.1.jar:2.3.24.1] at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99) [struts2-core-2.3.24.1.jar:2.3.24.1] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.61] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.61] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) [catalina.jar:7.0.61] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) [catalina.jar:7.0.61] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) [catalina.jar:7.0.61] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) [catalina.jar:7.0.61] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) [catalina.jar:7.0.61] at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) [catalina.jar:7.0.61] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) [catalina.jar:7.0.61] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) [catalina.jar:7.0.61] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) [tomcat-coyote.jar:7.0.61] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) [tomcat-coyote.jar:7.0.61] at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318) [tomcat-coyote.jar:7.0.61] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [?:1.7.0_79] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [?:1.7.0_79] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-coyote.jar:7.0.61] at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79] 

• Est-ce que je fais quelque chose de mal?
• Existe-t-il une autre façon de charger cette collection paresseuse?

EDIT 01-12-2015

J’ai essayé de suivre la réponse de Predrag Maric et j’ai un petit travail d’édition à faire car il semble que cela ne fonctionne toujours pas.

Alors:

1. Implémenter un modèle de session ouverte dans la vue

En aucune façon. Cette solution peut entraîner un chargement très profond des relations, notamment pour la sérialisation JSON. Bien sûr, je peux toujours définir la et charger ce dont j’ai besoin, mais j’ai encore un peu peur des performances.

2. Initialisez tout ce dont vous avez besoin dans le premier service

Et voici le point. J’ai changé mon action et ma structure DAO afin de mettre en œuvre cette fonction. J’ai utilisé un peu de reflection afin de créer une méthode générale que je peux utiliser dans chaque DAO de mon application.

Comment ça marche est très simple:

Exemple

CONTRIBUTION:

• beanClass: Équipe
• modèle: équipe sans relation chargée
• relations: Liste: {“relation”, “relation.childRelation.grandChildRelation”}

La méthode pour la première chaîne appelle simplement la méthode Hibernate.initialize() et pour la seconde, elle scinde la chaîne afin de charger:

• realation, retourne initializeRelations(relation.class, relation, "childRelation.grandChildRelation");
• childRelation, retourne initializeRelations(childRelation.class, childRelation, "grandChildRelation");
• grandChildRelation;

Ici vous avez le code:

TEAM DAO

Ces méthodes sont appelées après le chargement d’un bean team ou d’une liste de beans team à partir de la firebase database.

 /** * Initialize relations. This method returns true if a correct * initialization of the relation has been made by hibernate, false in any * other case. If the relations object is a List, the method recursively * call himself in order to initialize every single instance of the list. * If the relations ssortingng contains a "." it means that a grandchild * relation has to be loaded. * * @param beanClass * @param model * @param relations * @return boolean */ public boolean initializeRelations(Class beanClass, BaseModel model, Object relations) { // Check if relations is a List if (relations instanceof List) { // Recursively call initializeRelations for (Ssortingng relation : (List) relations) { return initializeRelations(beanClass, model, relation); } } else if (relations instanceof Ssortingng) { // If relations contains "." then a grandChild relation has to be loaded. if (((Ssortingng) relations).contains(".")) { Ssortingng[] childRelations = ((Ssortingng) relations).split("\\."); // Initialize the child relation Object newChildRelations = initializeRelation(beanClass, model, childRelations[0]); if (newChildRelations == null) { return false; } else if (newChildRelations instanceof BaseModel) { initializeRelations(newChildRelations.getClass(), model, (Object[]) Arrays.copyOfRange(childRelations, 1, childRelations.length)); } else if (newChildRelations instanceof List) { for (Object newChildRelation : childRelations) { initializeRelations(newChildRelation.getClass(), model, (Object[]) Arrays.copyOfRange(childRelations, 1, childRelations.length)); } } } else { Object newChildRelations = initializeRelation(beanClass, model, (Ssortingng) relations); return newChildRelations == null; } } return false; } private Object initializeRelation(Class beanClass, BaseModel model, Ssortingng relation) { try { for (PropertyDescriptor pd : Introspector.getBeanInfo(beanClass).getPropertyDescriptors()) { if (pd.getReadMethod() != null && !"class".equals(pd.getName()) && relation.toLowerCase().equals(pd.getName().toLowerCase()) && pd.getReadMethod().invoke(model) == null) { Hibernate.initialize(pd.getReadMethod().invoke(model)); return pd.getReadMethod().invoke(model); } } } catch (IntrospectionException ex) { LOG.warn("Cannot initialize ralation", ex); } catch (HibernateException | IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) { LOG.warn("Cannot initialize ralation", ex); } return null; } 

Mais ce que je vois dans mon journal est que seule la première relation est chargée

 [DEBUG] 01-12-2015 14:06:52 Controller - relation: Employee{data1="data1", data2="data2", data3="data3", data4="data4", data5="data5"} [DEBUG] 01-12-2015 14:06:52 Controller - child: [!!!model.Registry_$$_javassist_17@75ce9b7d=>org.hibernate.LazyInitializationException:could not initialize proxy - no Session!!!] 

• Implémentation de référence de chargement paresseux
• Hibernate: org.hibernate.LazyInitializationException: impossible d’initialiser le proxy – pas de session
• Quand la récupération d’un identifiant de proxy Hibernate initialise-t-elle le proxy?
• JPA / Hibernate: Relations @ManyToOne et @OneToOne marquées FetchType.LAZY et optional = false ne se chargeant pas paresseusement sur em.find ()?
• Charger un graphe d’object récursif sans N + 1 produit cartésien avec JPA et Hibernate

 sfBuilder.getProperties().put("hibernate.enable_lazy_load_no_trans", "true"); 

 teamService.getTeam(id, init); // and then in getTeam() if (init) { Hibernate.initialize(employee.getRegistry()); } 

 public class InitConfig { ... private boolean initRegistry; ... } teamService.getTeam(id, initConfig); // and then in getTeam() if (initConfig.getInitRegistry()) { Hibernate.initialize(employee.getRegistry()); }