What steps will reproduce the problem? 1. Declare two entity linked by OneToMany (Parent->OneToMany->Child) relation. Owner relationship has a List with a collection of objects. (Parent.childs) 2. Adding other ManyToOne relations Lazy loading works fine, but not with ArrayCollection. FetchType.EAGER works fine.

What is the expected output? What do you see instead? Not lazy collection.

What version of the product are you using? Spring3-BlazeDS4-dpHibernate2.0-RC6-Hibernate-3.3-MySQL-Flex SDK 4+ On what operating system? Windows 7

Please provide any additional information below.

Error I obtain:

10:40:44,763 DEBUG SessionImpl:220 - opened session at timestamp: 13390584447 10:40:44,787 DEBUG SessionImpl:220 - opened session at timestamp: 13390584447 {operation})****************getPadreList 10:40:44,788 DEBUG AbstractBatcher:358 - about to open PreparedStatement (open PreparedStatements: 0, globally: 0) 10:40:44,788 DEBUG ConnectionManager:415 - opening JDBC connection 10:40:44,789 DEBUG SQL:393 - select this_.id as id0_0_, this_.name as name0_0_ from prueba.padre this_ Hibernate: select this_.id as id0_0_, this_.name as name0_0_ from prueba.padre this_ 10:40:44,789 DEBUG AbstractBatcher:374 - about to open ResultSet (open ResultSets: 0, globally: 0) 10:40:44,789 DEBUG Loader:1164 - result row: EntityKey[es.prueba.model.Padre#1] 10:40:44,790 DEBUG Loader:1164 - result row: EntityKey[es.prueba.model.Padre#2] 10:40:44,791 DEBUG Loader:1164 - result row: EntityKey[es.prueba.model.Padre#3] 10:40:44,791 DEBUG AbstractBatcher:381 - about to close ResultSet (open ResultSets: 1, globally: 1) 10:40:44,792 DEBUG AbstractBatcher:366 - about to close PreparedStatement (open PreparedStatements: 1, globally: 1) 10:40:44,792 DEBUG TwoPhaseLoad:107 - resolving associations for [es.prueba.model.Padre#1] 10:40:44,792 DEBUG TwoPhaseLoad:206 - done materializing entity [es.prueba.model.Padre#1] 10:40:44,792 DEBUG TwoPhaseLoad:107 - resolving associations for [es.prueba.model.Padre#2] 10:40:44,793 DEBUG TwoPhaseLoad:206 - done materializing entity [es.prueba.model.Padre#2] 10:40:44,794 DEBUG TwoPhaseLoad:107 - resolving associations for [es.prueba.model.Padre#3] 10:40:44,794 DEBUG TwoPhaseLoad:206 - done materializing entity [es.prueba.model.Padre#3] 10:40:44,794 DEBUG StatefulPersistenceContext:748 - initializing non-lazy collections 10:40:44,794 DEBUG DistinctRootEntityResultTransformer:46 - transformed: 3 rows to: 3 distinct results 10:40:44,794 DEBUG ConnectionManager:296 - transaction completed on session with on_close connection release mode; be sure to close the session to release JDBC resources! {invoke} 7 java.lang.NullPointerException at org.dphibernate.serialization.HibernateSerializer.getCollectionProxies(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeAbstractPersistentCollection(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeCollection(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.adapters.RemotingAdapter.invoke(Unknown Source) at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183) at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1406) at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:1005) at flex.messaging.endpoints.AbstractEndpoint$$FastClassByCGLIB$$1a3ef066.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:692) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.flex.core.MessageInterceptionAdvice.invoke(MessageInterceptionAdvice.java:66) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(Cglib2AopProxy.java:576) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$2c4cc0f6.serviceMessage(<generated>) at flex.messaging.endpoints.amf.MessageBrokerFilter.invoke(MessageBrokerFilter.java:103) at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158) at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:44) at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67) at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:166) at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:308) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$2c4cc0f6.service(<generated>) at org.springframework.flex.servlet.MessageBrokerHandlerAdapter.handle(MessageBrokerHandlerAdapter.java:101) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 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:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) java.lang.NullPointerException at org.dphibernate.serialization.HibernateSerializer.getCollectionProxies(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeAbstractPersistentCollection(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeCollection(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.adapters.RemotingAdapter.invoke(Unknown Source) at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183) at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1406) at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:1005) at flex.messaging.endpoints.AbstractEndpoint$$FastClassByCGLIB$$1a3ef066.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:692) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.flex.core.MessageInterceptionAdvice.invoke(MessageInterceptionAdvice.java:66) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(Cglib2AopProxy.java:576) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$2c4cc0f6.serviceMessage(<generated>) at flex.messaging.endpoints.amf.MessageBrokerFilter.invoke(MessageBrokerFilter.java:103) at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158) at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:44) at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67) at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:166) at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:308) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$2c4cc0f6.service(<generated>) at org.springframework.flex.servlet.MessageBrokerHandlerAdapter.handle(MessageBrokerHandlerAdapter.java:101) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 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:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) java.lang.NullPointerException at org.dphibernate.serialization.HibernateSerializer.getCollectionProxies(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeAbstractPersistentCollection(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeCollection(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.writeBean(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.serialization.HibernateSerializer.serialize(Unknown Source) at org.dphibernate.adapters.RemotingAdapter.invoke(Unknown Source) at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183) at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1406) at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:1005) at flex.messaging.endpoints.AbstractEndpoint$$FastClassByCGLIB$$1a3ef066.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:692) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.flex.core.MessageInterceptionAdvice.invoke(MessageInterceptionAdvice.java:66) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(Cglib2AopProxy.java:576) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$2c4cc0f6.serviceMessage(<generated>) at flex.messaging.endpoints.amf.MessageBrokerFilter.invoke(MessageBrokerFilter.java:103) at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158) at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:44) at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67) at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:166) at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:308) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$2c4cc0f6.service(<generated>) at org.springframework.flex.servlet.MessageBrokerHandlerAdapter.handle(MessageBrokerHandlerAdapter.java:101) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647){serialize} 8

at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

10:40:44,803 DEBUG ConnectionManager:435 - releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)]

10:40:44,804 DEBUG ConnectionManager:296 - transaction completed on session with on_close connection release mode; be sure to close the session to release JDBC resources!

I've got it!, sorry but there were a problem width "flex-servlet.xml" configuration. Missing: