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org.hibernate.SessionException: Session is closed!	at org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:50)	at org.hibernate.impl.SessionImpl.getPersistenceContext(SessionImpl.java:1794)	at org.hibernate.proxy.BasicLazyInitializer.getReplacement(BasicLazyInitializer.java:100)	at org.hibernate.proxy.BasicLazyInitializer.invoke(BasicLazyInitializer.java:54)	at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:156)	at com.mjoy.dcmbase.entities.Medio$$EnhancerByCGLIB$$52ca026d.writeReplace()	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:896)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1011)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)	at java.util.HashMap.writeObject(HashMap.java:980)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:809)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1296)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)	at org.hibernate.util.SerializationHelper.serialize(SerializationHelper.java:148)	at org.hibernate.util.SerializationHelper.serialize(SerializationHelper.java:172)	at org.hibernate.type.SerializableType.toBytes(SerializableType.java:74)	at org.hibernate.type.SerializableType.deepCopyNotNull(SerializableType.java:70)	at org.hibernate.type.MutableType.deepCopy(MutableType.java:25)	at org.hibernate.type.TypeFactory.deepCopy(TypeFactory.java:323)	at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:255)	at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167)	at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101)	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:98)	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)	at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:529)	at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:521)	at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:517)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:292)	at $Proxy0.saveOrUpdate(Unknown Source)	at com.mjoy.dcmbase.persistence.PersistenceManager.saveOrUpdate(PersistenceManager.java:247)	at com.mjoy.dcmbase.entities.Sesion.saveOrUpdate(Sesion.java:221)	at com.mjoy.dcm.handler.RankingLogic.empiezaTransaccion(RankingLogic.java:104)	at com.mjoy.dcm.handler.VentaRankingHandler.execute(VentaRankingHandler.java:76)	at com.mjoy.dcm.servlets.DCM.doAction(DCM.java:115)	at com.mjoy.dcm.servlets.DCM.doGet(DCM.java:149)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)	at java.lang.Thread.run(Thread.java:534)