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The select() method of the CriteriaQuery interface is used to form the SELECT clause in a criteria API query definition. All forms of the SELECT clause may be represented via the select() method, although convenience methods also exist to simplify coding. The select() method requires an argument of type Selection, an interface extended by Expression as well as CompoundSelection to handle the case where the result type of a query is a Tuple or array of results.

NOTE Some vendors may allow the call to select() to be omitted in the case where there is a single query root and it matches the declared result type for the query. This is non-portable behavior.

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principal and credential. On successful authentication, this method returns the Authentication object with the user s role list. This will be required later during authorization. The authenticated user is redirected to the URL specified by the property defaultTargetUrl. In this case, the user is directed to the web page for underwriting a new policy. If the authentication fails, an AuthenticationException will be raised. In this case, the user is redirected to the URL set in the property authenticationFailureUrl. In this example, the user is redirected to the login page. The errorId specified in the authenticationFailureUrl flags the login.jsp file in Listing 6-5 to display the error messages because of an authentication failure. Spring Security provides one custom authentication manager implementation in the form of the ProviderManager class. This in turn delegates to authentication providers. Authentication providers are adapters for the underlying authentication technology. With this strategy, it is possible to authenticate with any identity management system. The ProviderManager class can be configured to work with multiple authentication providers. It will iterate through the list of authentication providers until the user is authenticated by one of them or the provider collection is exhausted. Listing 6-8 shows the provider manager configuration.

Thus far, we have been passing in a query root to the select() method, therefore indicating that we want the entity to be the result of the query We could also supply a single-valued expression such as selecting an attribute from an entity or any compatible scalar expression The following example demonstrates this approach by selecting the name attribute of the Employee entity: CriteriaQuery<String> c = cbcreateQuery(Stringclass); Root<Employee> emp = cfrom(Employeeclass); cselect(emp<String>get("name")); This query will return all employee names, including any duplicates Duplicate results from a query may be removed by invoking distinct(true) from the AbstractQuery interface This is identical in behavior to the DISTINCT keyword in a JP QL query Also note the unusual syntax we used to declare that the name attribute was of type String.

Taking the requirements listed previously, we scan for nouns to identify likely candidates for our POJO objects. These are Client Product Catalog Price Stock Order We will discard Client since we are assuming that client logic already exists. For our purposes, this will essentially correspond to the test harness logic. We examine our classes in turn and outline their attributes. The Product consists of a Stock Keeping Unit (SKU) and a description. The Price consists of the price and the Product with which it is associated. The Catalog consists of the catalog name and a list of Products at specific Prices. We will separate out the pairs of priced products as CatalogEntry classes. A Catalog, therefore, consists of a set of CatalogEntry objects. The CatalogEntry consists of a Product and a Price attribute. The Stock consists of the number of units in stock and the Product with which it is associated. The Order needs to represent the set of items that a customer has purchased, the price that they were to be charged, and the number of units of each product that they were purchasing. The combination of price, product, and quantity is usually referred to as a line item (simply because it represents a single line on an invoice) and so we will refactor this out as a LineItem class. To recap, LineItems, therefore, consist of a Price, Product, and quantity attribute. Our Order class now consists of a set of LineItem entries but we would like to distinguish between the orders that are pending and the orders that have been expedited. There are a number of ways to represent this distinction, but we will select the simplest for our example, and add an attribute to the Order class.

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