I am getting the below exception when the object tries to load the collection:

Caused by: org.hibernate.exception.GenericJDBCException: could not initialize a collection batch: [gov.ma.eohhs.newmmis.clm.model.PdPhysicianDetailAIM00.PaymentInfos#<component[sakClaim,numDetails]{sakClaim=400012628, numDetails=1}, component[sakClaim,numDetails]{sakClaim=400012628, numDetails=2}>]
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.loadCollectionBatch(Loader.java:2030)
at org.hibernate.loader.collection.BatchingCollectionInitializer.initialize(BatchingCollectionInitializer.java:47)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at org.hibernate.collection.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:454)
at gov.ma.eohhs.newmmis.clm.view.DetailPaymentInfoController.loadData(DetailPaymentInfoController.java:156)
at gov.ma.eohhs.newmmis.base.view.BaseMaintenanceController.setParentControllerName(BaseMaintenanceController.java:321)
at gov.ma.eohhs.newmmis.base.view.BaseNavigationController.recursiveShowPanel(BaseNavigationController.java:439)
at gov.ma.eohhs.newmmis.base.view.BaseNavigationController.showItemPanel(BaseNavigationController.java:406)
at gov.ma.eohhs.newmmis.base.view.BaseNavigationController.handleEvents(BaseNavigationController.java:364)
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:585)
at org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:129)
at gov.ma.eohhs.newmmis.base.view.components.navigator.Navigator.broadcast(Navigator.java:1013)
at org.ajax4jsf.framework.ajax.AjaxViewRoot.processEvents(AjaxViewRoot.java:281)
at org.ajax4jsf.framework.ajax.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:257)
at org.ajax4jsf.framework.ajax.AjaxViewRoot.processApplication(AjaxViewRoot.java:412)
at org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:316)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:232)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at gov.ma.eohhs.newmmis.base.view.HibernateSessionFilter.doFilterInternal(HibernateSessionFilter.java:332)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at gov.ma.eohhs.newmmis.base.servlet.PreferencesFilter.doFilter(PreferencesFilter.java:136)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at gov.ma.eohhs.newmmis.base.servlet.NoMultipleSubmitFilter.doFilter(NoMultipleSubmitFilter.java:99)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at gov.ma.eohhs.newmmis.base.servlet.SecurityFilter.doFilter(SecurityFilter.java:162)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:122)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3229)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2002)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1908)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1362)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
Caused by: java.sql.SQLException: Io exception: End of TNS data channel
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:815)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1037)
at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:839)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1132)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3316)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3361)
at weblogic.jdbc.wrapper.PreparedStatement.executeQuery(PreparedStatement.java:100)
at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:186)
at org.hibernate.loader.Loader.getResultSet(Loader.java:1778)
at org.hibernate.loader.Loader.doQuery(Loader.java:662)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.loadCollectionBatch(Loader.java:2023)
at org.hibernate.loader.collection.BatchingCollectionInitializer.initialize(BatchingCollectionInitializer.java:47)

Root Cause:Caused by: java.sql.SQLException: Io exception: End of TNS data channel

The object model is as foll:

Below is the mapping between Claim-ClaimDetails:

mapping between ClaimDetails-PaymentInfos:

It is able to load other collections mapped similarly except this. After the getPaymentInfos() is called in ClaimDetails obj, it throws the above exception

Any help/pointers is very much appreciated,
Thank you in advance.