Just for clarification some of my requirements: - Session scoped "leftTreeBean" (because conversation is too short) - "leftTreebean" provides a getRoot method that creates a new TreeNodeimpl and makes db query to populate first level of the tree. Tree nodes are a custom class ClazzTreeNode. ClazzTreeNode is not a seam component. Just a java object. Its "getChildren" makes a database call to a dao to find out the children of a specific node. I would like to push the code to findChildrens, findFirstLevel and so on into another classes (DAO) to be able to reuse them. Note: During working with the application tree can be modified. | Tree is huge (about 2.5 million nodes) so it cannot be loaded in memory. | I expect DAO-s to be stateless session beans | | I use richfaces with ajax switch type. | | Any critics to this design ? | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4092447#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...