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tables constraints 368, 370 joining one entity to two tables 342 moving properties to secondary 342 per class hierarchy 199, 316 per concrete class 192, 316, 319 per concrete class with union 195, 316 317 per subclass 203, 316 targetEntity 263 temporal data 545 TemporalType 219 temporary Session 552 ternary association with components 307 with maps 311 ternary logic 636, 667 for restrictions 635 test class, writing 741 test method 733 test suite 733, 735 creating and running 734 testing 730 base data sets 740 business logic 732 creating suites 734 for failure 733 overview 731 persistence layer 736 preparing integration 736 TestNG 730, 732 introduction 732 logic unit test 732 theta-style joins 644 645, 652, 820 ThreadLocal Session 481 ThreadLocal Session pattern 482 timeout 440, 445, 624 timestamp 461 Tomcat 98, 102 TooShortOrLongUsername 800 Transaction API 438, 445 transaction assemblies complex 512 transaction demarcation 435 declarative 437 programmatic 435

When you first start the Performance tool, the graph displays three counters by default: Pages/sec Represents the rate at which pages are read from or written to disk during virtual memory operations. Consistently high values can indicate that not enough memory is present on a computer. Avg. Disk Queue Length Represents the average number of read and write requests queued for the selected disk. Consistent values above 0 means that requests are backing up, which might indicate not enough memory or a slow disk system. %Processor Time Represents the percentage of elapsed time that the processor spends executing nonidle tasks. Consistently high values (exceeding approximately 80 percent) might indicate that the processor is slowing down your computer.

Adding counters to an object (such as those described in Table 19-3) allows you to track certain aspects of the object. The three default counters loaded with System Monitor actually do a very good job of representing the basic aspects of a computer s performance. Of course, they are only three of the hundreds of counters that are available. The counters that you monitor depend on whether you are trying to collect general baseline information, troubleshoot a performance problem, diagnose an issue with an application, and so on. The following steps allow you to add counters to an object in System Monitor: 1. At the bottom of the Performance console, right-click Counter and click Add Counters. The Add Counters dialog box appears. 2. In the Performance Object list box, select the object for which you want to add counters. 3. Ensure that Select Counters From List is selected. You can add all counters, but that usually provides more information than you need or can interpret. 4. Select a counter from the list, and click Add.

automatically scans and finds the metadata on startup. Compared to pure Hibernate, you now have these benefits:

19-16

19

Automatic scanning of deployed metadata, an important feature in large projects. Maintaining a list of annotated classes or mapping files becomes difficult if hundreds of entities are developed by a large team. Standardized and simplified configuration, with a standard location for the configuration file, and a deployment concept the persistence unit that has many more advantages in larger projects that wrap several units (JARs) in an application archive (EAR). Standardized data access code, entity instance lifecycle, and queries that are fully portable. There is no proprietary import in your application.

In the following case scenarios, you will apply what you ve learned about the Windows 7 deployment process. You can find answers to these questions in the Answers section at the end of this book.

If you want to add several counters at the same time, you can hold down Ctrl to select individual counters from the list. You can hold down Shift if you want to select several counters in a row, and click the first in the list you want and then click the last in the list that you want to select. All counters listed between the first and last you clicked are automatically selected.

5. When you have completed your selection of objects and counters, click Close to return to the Performance console. Table 19-4 explains a few of the counters that you might find useful for evaluating your computer s performance.

These are only some of the advantages of JPA. You ll see its real power if you combine it with the full EJB 3.0 programming model and other managed components.

Table 19-4