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Most modern-day applications are developed iteratively. The system grows gradually as more and more requirements become available. The core of such systems is a high-level design and architecture that evolves through iterations. It is also imperative that design and architecture are documented in both text and visual forms for the benefit of the development and maintenance teams. The visual representation is immensely useful because it helps developers understand runtime interactions and compile-time dependencies. UML is a graphical language used for modeling and visualizing architecture and detailed design in complex enterprise systems. It is based on a specification developed by Object Management Group (OMG). I will use UML 2.0 notations (which is the latest version) available at http://www.uml.org/. However, UML is not limited to architecture and design but can be used in all phases of software development. UML provides a rich set of notation to depict the classes and objects and various relationship and interactions. Modern UML modeling tools such as IBM Rational XDE, Visual Paradigm, Sparx Systems Enterprise Architect, and so on, allow design patterns and best practices to be applied during system design. Moreover, with these tools, the design model can be used to generate significant portions of the application source code. There are several kinds of UML diagram. But for analysis of Java EE design patterns, I will concentrate primarily on class and sequence diagrams and a simple extension mechanism called stereotypes. If you are new to UML or eager to know more, the best UML reference is UML Distilled Third Edition by Martin Fowler (Addison Wesley, 2005).

A new Employee instance is then created, supplying the primary key and basic information about the Employee We then assign the employee to the department, by setting the department attribute of the Employee to point to the Department instance we retrieved earlier Because the relationship is bidirectional, we then add the new Employee instance to the employees collection in the Department instance Finally the new Employee instance is persisted with the call to persist() Assuming a transaction then commits, the new entity will be stored in the database An interesting thing about this example is that the Department is a passive participant despite the Employee instance being added to its collection The Employee entity is the owner of the relationship because it is in a many-to-one relationship with the Department.

Note SQL injection is an attack against applications that create SQL directly from user input with string

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As we mentioned in 4, the source side of the relationship is the owner, while the target is the inverse in this type of relationship When the Employee is persisted, the foreign key to the Department is written out to the table mapped by the Employee, and no actual change is made to the Department entity s physical representation Had we only added the employee to the collection and not updated the other side of the relationship, nothing would have been persisted to the database..

A class diagram depicts the static relationships that exist among a group of classes and interfaces in the system. The different types of relationships that I will discuss are generalization, aggregation, and inheritance. Figure 1-8 shows the UML notation for a class used to represent the details of an insurance claim. It is represented by a rectangle with three compartments. The first compartment is the name of the class. The second compartment denotes the attributes in the class, and the last one shows the operations defined on these attributes. Note that the + and signs before the attribute and method names are used to represent the visibility. The + sign denotes public visibility, and the sign denotes private visibility or that the attribute is not accessible outside this class. Also note that, optionally, you can denote the data type of the attributes, method return type, and parameters.

The ever-present find() method is the workhorse of the entity manager. Whenever an entity needs to be located by its primary key, find() is usually the best way to go. Not only does it have simple semantics, but most persistence providers will also optimize this operation to use an in-memory cache that minimizes trips to the database. The find() operation returns a managed entity instance in all cases except when invoked outside of a transaction on a transaction-scoped entity manager. In this case, the entity instance is returned in a detached state. It is not associated with any persistence context.

concatenation. For instance, if we accept a name from the user through a web application form, then very bad form would be to construct an SQL (or HQL) query like this:

There exists a special version of find() that can be used in one particular situation That situation is when a relationship is being created between two entities in a one-to-one or many-to-one relationship in which the target entity already exists and its primary key is well known Because we are only creating a relationship, it might not be necessary to fully load the target entity to create the foreign key reference to it Only its primary key is required The getReference() operation can be used for this purpose Consider the following example: Department dept = emgetReference(Departmentclass, 30); Employee emp = new Employee(); empsetId(53); empsetName("Peter"); empsetDepartment(dept); deptgetEmployees()add(emp); empersist(emp); The only difference between this sequence of operations and the ones we demonstrated earlier is that the find() call has been replaced with a call to getReference().

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