Hibernate Lazy Load error

seen in production - unsure of path to reporduce:

org.sakaiproject.portal.api.PortalHandlerException: org.sakaiproject.tool.api.ToolException: org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: javax.faces.el.EvaluationException: javax.faces.el.EvaluationException: Error getting property 'attachList' from bean of type org.sakaiproject.tool.messageforums.ui.DiscussionTopicBean: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.attachmentsSet, no session or session was closed
at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:881)
caused by: org.sakaiproject.tool.api.ToolException: org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: javax.faces.el.EvaluationException: javax.faces.el.EvaluationException: Error getting property 'attachList' from bean of type org.sakaiproject.tool.messageforums.ui.DiscussionTopicBean: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.attachmentsSet, no session or session was closed
at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1470)
caused by: org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: javax.faces.el.EvaluationException: javax.faces.el.EvaluationException: Error getting property 'attachList' from bean of type org.sakaiproject.tool.messageforums.ui.DiscussionTopicBean: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.attachmentsSet, no session or session was closed
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
caused by: javax.servlet.ServletException: javax.servlet.jsp.JspException: javax.faces.el.EvaluationException: javax.faces.el.EvaluationException: Error getting property 'attachList' from bean of type org.sakaiproject.tool.messageforums.ui.DiscussionTopicBean: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.attachmentsSet, no session or session was closed
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:841)
caused by: javax.faces.el.EvaluationException: javax.faces.el.EvaluationException: Error getting property 'attachList' from bean of type org.sakaiproject.tool.messageforums.ui.DiscussionTopicBean: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.attachmentsSet, no session or session was closed
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:143)
caused by: javax.faces.el.EvaluationException: Error getting property 'attachList' from bean of type org.sakaiproject.tool.messageforums.ui.DiscussionTopicBean: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.attachmentsSet, no session or session was closed
at com.sun.faces.el.impl.ArraySuffix.evaluate(ArraySuffix.java:187)
caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.attachmentsSet, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:163)
at org.sakaiproject.component.app.messageforums.dao.hibernate.Util.setToList(Util.java:34)
at org.sakaiproject.component.app.messageforums.dao.hibernate.TopicImpl.getAttachments(TopicImpl.java:111)
at org.sakaiproject.tool.messageforums.ui.DiscussionTopicBean.getAttachList(DiscussionTopicBean.java:1004)
at sun.reflect.GeneratedMethodAccessor2282.invoke(null:-1)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.faces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:99)
at com.sun.faces.el.impl.ArraySuffix.evaluate(ArraySuffix.java:187)
at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:171)
at com.sun.faces.el.impl.UnaryOperatorExpression.evaluate(UnaryOperatorExpression.java:187)
at com.sun.faces.el.impl.BinaryOperatorExpression.evaluate(BinaryOperatorExpression.java:185)
at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:263)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:160)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:143)
at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:335)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getChildren(HtmlBasicRenderer.java:490)
at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:148)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:721)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:465)
at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:253)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:721)
at javax.faces.webapp.UIComponentTag.encodeChildren(UIComponentTag.java:629)
at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:566)
at com.sun.faces.taglib.html_basic.PanelGridTag.doEndTag(PanelGridTag.java:460)