org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: model.Category.subcategoryCollection, 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.PersistentBag.toString(PersistentBag.java:483)
        at org.netbeans.modules.hibernate.hqleditor.ui.HQLEditorTopComponent.createTableData(HQLEditorTopComponent.java:544)
        at org.netbeans.modules.hibernate.hqleditor.ui.HQLEditorTopComponent.setResult(HQLEditorTopComponent.java:488)
        at org.netbeans.modules.hibernate.hqleditor.HQLEditorController$1.run(HQLEditorController.java:131)