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It is important to note that Spring MVC is not the only way of connecting to the Spring business tier. It is possible to expose Spring business objects as web services. Similarly, various other remoting options like Spring remoting, Burlap-Hessian, and so on, can be used to connect to Spring components, making them available as remote components. I will explore a few remoting solutions in connection with the integration tier patterns in 4.

If we did not want to (or were not able to) use the typed parameter version of Map<KeyType, ValueType>, we would define it using the non-parameterized style of Map shown in Listing 5-19 Listing 5-19 One-to-Many Relationship Using a Non-parameterized Map @Entity public class Department { // .. @OneToMany(targetEntity=Employeeclass, mappedBy="department") @MapKey private Map employees; // .. } The targetEntity element only ever indicates the type of the Map value Of course, if the Map holds an element collection and not a relationship, the targetClass element of @ElementCollection is used to indicate the value type of the Map In Listing 5-19, the type of the Map key can be easily deduced because the mapping is an entity relationship The @MapKey default is to use the identifier attribute, id, of type int or Integer.

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As you can see, this makes paging through the result set easy. You can increase the first result you return from 1, to 21, to 41, etc. to page through the result set. If you only have one result in your result set, Hibernate has a shortcut method for obtaining just that object.

If @MapKey had been specified and dictated that the key be an attribute that was not an identifier attribute, the type would still have been deducible because the entity attributes are all mapped with known types However, if the key isn t an attribute of the target entity, @MapKeyClass might be used instead of @MapKey It indicates the type of the key class when the Map is not defined in a typed way using generics It is also used when the Map references an element collection instead of a relationship because basic or embeddable types do not have identifier attributes, and basic types do not even have attributes To illustrate how @MapKeyClass is used, let s take the element collection in Listing 5-7 and assume that it does not define the type parameters on the Map.

The integration tier in most applications interacts with the RDBMS using the JDBC API through POJO data access objects. The data access objects provide a consistent API for the business tier objects and wrap the JDBC API. Spring DAO provides templates for simple and flexible data access objects. The data access objects update relational databases as well as retrieve data from them. The retrieved data is wrapped in JavaBean objects and returned to the layers above. Just like the other two tiers, Spring provides plenty of options even in the integration tier. Spring ORM allows development teams to easily use an object relational bridge solution such as Hibernate or TopLink. The integration tier in a Java EE application is not limited to communicating with relational databases. It can be a requirement to connect to a mainframe or an ERP or CRM system. Just as with the business tier, here too we can leverage the Spring JEE module to connect to these systems and applications using standard technologies such as JCA or web services.

The typing is filled in through the use of the @MapKeyClass annotation and the targetClass element in @ElementCollection, as shown in Listing 5-20 Listing 5-20 Untyped Element Collection of Strings with String Keys @Entity public class Employee { @Id private int id;.

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