cascading

Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths

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All relationships in your model are required because all foreign key properties (CountryId, RegionId, CityId) are not nullable. For required one-to-many relationships EF will enable cascading delete by convention. Country and Region have multiple delete paths to the Store table, for example if you delete a Country the related Stores can be deleted via three … Read more

Make multiple dependent / cascading selection components in JSF

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Put the bean in the view scope and get rid of any business logic in getter methods. The bean must be placed in the view scope so that all previous selections and new available items are remembered for subsequent postbacks, otherwise things will fail when JSF needs to validate the selected item against the list … Read more