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Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 Summary Key Terms Case Scenarios Suggested Practices Take a Practice Test 261 262 262 263 264

Page 19-10

Connection jdbcConnection = session.connection();

Answers might vary, but if the CPU is barely being utilized (such as when WordPad is the only running application), the CPU does not slow down the performance of the computer.

Page 19-11

This last option comes with some caveats: You aren t allowed to close the JDBC Connection you get from Hibernate this happens automatically. The exception to this rule is that in an environment that relies on aggressive connection releases, which means in a JTA or CMT environment, you have to close the returned connection in application code. A better and safer way to access a JDBC connection directly is through resource injection in a Java EE 5.0. Annotate a field or setter method in an EJB, an EJB listener, a servlet, a servlet filter, or even a JavaServer Faces backing bean, like this:

1. Which of the following methods can you use to start Task Manager (Choose all that apply.) a. Press CTRL+ALT+ESC b. Right-click the Desktop, and then click Task Manager c. Press CTRL+SHIFT+ESC d. Press CTRL+ALT+DELETE, and if necessary, click Task Manager

The correct answers are C and D. A and B are not correct because you cannot launch Task Manager by using these methods.

@Resource(mappedName="java:/HelloWorldDS") DataSource ds;

2. Which of the following tabs can be found in Task Manager (Choose all that apply.) a. Networking tab b. Programs tab c. Processes tab d. General tab

The correct answers are A and C. B is not correct because there is no Programs tab in Task Manager; programs are managed by using the Applications tab. D is not correct because there is no General tab in Task Manager.

So far, we ve assumed that you work on a new Hibernate or JPA project that involves no legacy application code or existing database schema. We now switch perspectives and consider a development process that is bottom-up. In such a scenario, you probably want to automatically reverse-engineer artifacts from an existing database schema.

Questions and Answers 19-31

7

3. What are page faults Do you think a larger or smaller number of page faults indicates better system performance Why

Your first step when mapping a legacy database likely involves an automatic reverse-engineering procedure. After all, an entity schema already exists in your database system. To make this easier, Hibernate has a set of tools that can read a schema and produce various artifacts from this metadata, including XML mapping files and Java source code. All of this is template-based, so many customizations are possible. You can control the reverse-engineering process with tools and tasks in your Ant build. The HibernateToolTask you used earlier to export SQL DDL from

Each time data has to be retrieved from the page file on the hard disk for a process, the data has been paged out of physical memory. This is known as a page fault. A smaller number of page faults indicates better system performance because it is faster to retrieve data from RAM than from a paging file on the hard drive.

4. What does CPU usage represent In general, is system performance better with a high CPU usage value or a low value

Hibernate mapping metadata has many more options, most of which are related to reverse engineering, as to how XML mapping files, Java code, or even whole application skeletons can be generated automatically from an existing database schema. We ll first show you how to write an Ant target that can load an existing database into a Hibernate metadata model. Next, you ll apply various exporters and produce XML files, Java code, and other useful artifacts from the database tables and columns.