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The primary key class must contain fields or properties that match the primary key attributes in the entity in both name and type. Listing 10-5 shows the EmployeeId primary key class. It has two fields, one to represent the country and one to represent the employee number. We have also supplied equals() and hashCode() methods to allow the class to be used in sorting and hashing operations. Listing 10-5. The EmployeeId Id Class public class EmployeeId implements Serializable { private String country; private int id; public EmployeeId() {} public EmployeeId(String country, int id) { this.country = country; this.id = id; } public String getCountry() { return country; } public int getId() { return id; } public boolean equals(Object o) { return ((o instanceof EmployeeId) && country.equals(((EmployeeId)o).getCountry()) && id == ((EmployeeId)o).getId()); } public int hashCode() { return country.hashCode() + id; }

<input type=" button" value="Update" onClick=" eventValidateAndSubmit ('UWR002','SCR001')"/> </form>

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Note that there are no setter methods on the EmployeeId class. Once it has been constructed using the primary key values, it can t be changed. We do this to enforce the notion that a primary key value cannot be changed, even when it is made up of multiple fields. Because the @Id annotation was placed on the fields of the entity, the provider will also use field access when it needs to work with the primary key class. The id class is useful as a structured object that encapsulates all of the primary key information. For example, when doing a query based upon the primary key, such as the find() method of the EntityManager interface, an instance of the id class can be used as an argument instead of some unstructured and unordered collection of primary key data. Listing 10-6 shows a code snippet that searches for an Employee with a given country name and employee number. A new instance of the EmployeeId class is constructed using the method arguments and then used as the argument to the find() method. Listing 10-6. Invoking a Primary Key Query on an Entity with an Id Class EmployeeId id = new EmployeeId(country, id); Employee emp = em.find(Employee.class, id);

The controller used this combination of event code and screen code to uniquely identify a block of code to be executed for each user action and subsequent selection of the next view to be rendered. This controller was another JSP and was cluttered with several long-running if-else blocks, as shown in Listing 3-2.

Now that we have a factory, we can easily obtain an entity manager from it. The following example demonstrates creating an entity manager from the factory that we acquired in the previous example: EntityManager em = emf.createEntityManager(); With this entity manager, we are now in a position to start working with persistent entities.

Before an object is saved. Permits the state of the object to be changed immediately before it is saved.

Persisting an entity is the operation of taking a transient entity, or one that does not yet have any persistent representation in the database, and storing its state so that it can be retrieved later This is really the basis of persistence creating state that may outlive the process that created it We are going to start by using the entity manager to persist an instance of Employee Here is a code example that does just that: Employee emp = new Employee(158); empersist(emp); The first line in this code segment is simply creating an Employee instance that we want to persist If we ignore the sad fact that we seem to be employing a nameless individual and paying him nothing (we are setting only the id, not the name or salary) the instantiated Employee is just a regular Java object.

<% String eventCode = request.getParameter("eventCode"); String screenCode = request.getParameter("screenCode"); String inputPage = request.getParameter("referrer"); Sting userCd = request.getParameter("userCode"); String nextView = ""; try{ SecurityChecker.getInstance().check(userCd, eventCode); if(screenCode.equals("SCR001") && eventCode.equals("UWR002")){ //Look up session bean //Create policy by invoking session bean method nextView = "Policy.jsp"; } else if(screenCode.equals("UWR002") && eventCode.equals("SCR001")){ //similar to above nextView = "Policy.jsp"; } else{ request.setAttribute("ERROR_MESSAGE", "You have attempted an unsupported function"); nextView = "error.jsp"; } } catch(AppException appExp){ request.setAttribute("ERROR_MESSAGE",exp.getMessage()); nextView = inputPage; } catch(Throwable exp){

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