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There are three interesting new elements in this configuration file. First, you set an explicit <provider> that should be used for this persistence unit. This is usually required only if you work with several JPA implementations at the same time, but we hope that Hibernate will, of course, be the only one. Next, the specification requires that you list all annotated classes with <class> elements if you deploy in a non-Java EE environment Hibernate supports autodetection of mapping metadata everywhere, making this optional. Finally, the Hibernate configuration setting archive.autodetection tells Hibernate what metadata to scan for automatically: annotated classes (class) and/or Hibernate XML mapping files (hbm). By default, Hibernate EntityManager scans for both. The rest of the configuration file contains all options we explained and used earlier in this chapter in the regular hibernate.cfg.xml file. Automatic detection of annotated classes and XML mapping files is a great feature of JPA. It s usually only available in a Java EE application server; at least, this is what the EJB 3.0 specification guarantees. But Hibernate, as a JPA provider, also implements it in plain Java SE, though you may not be able to use the exact same configuration with any other JPA provider. You ve now created an application that is fully JPA specification-compliant. Your project directory should look like this (note that we also moved log4j.properties to the etc/ directory):

Description The number of object handles in the tables of all processes. A handle represents a specific input/output (I/O) instance of a thread. The number of running threads, including one idle thread per processor. A thread is an object within a process that runs program instructions. The number of active processes, including the idle process. A process can have multiple threads, each of which in turn can have multiple handles.

Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.

WORKDIR +etc log4j.properties +META-INF persistence.xml +lib <all required libraries> +src +hello HelloWorld.java Message.java

Physical Memory (K): The amount of physical RAM installed in the computer. Total Available System Cache Commit Charge: Total Limit Peak Paged The amount of physical memory available to processes. The amount of physical memory released to the file cache on demand. The size of virtual memory in use by all processes. The amount of virtual memory that can be committed to all processes without enlarging the paging file. The maximum amount of virtual memory used in the session. The size of the paged pool allocated to the operating system. The paged pool is data in physical memory that can be written to the page file if Windows needs to make space in physical memory for other data. The size of the nonpaged pool allocated to the operating system. Windows cannot page all memory to a page file. In particular, many threads created by the Windows kernel cannot be paged.

When Task Manager is running, Windows XP Professional displays an accurate miniature CPU usage icon on the taskbar. If you point to the icon, Task Manager displays the percentage of processor usage in text format.

All JPA configuration settings are bundled in persistence.xml, all mapping metadata is included in the Java source code of the Message class, and Hibernate

The Networking tab in Task Manager, shown in Figure 19-4, displays a visual interpretation of the current network traffic on various network connections on the computer. Although it is possible to get an idea about network performance from this tab, it is actually more useful for giving you a quick snapshot of network availability on each connection configured on your computer.

19-9

mapping types (continued) custom 220 date and time 215 large values and locators 216 querying with 238 using 219 maps mapping 310 ternary associations 311 values as entity associations 310 marker interface 546 creating 546 MatchMode 667 max() 655 max_fetch_depth 581 maxelement() 661 maxindex() 661 MBean 103 merge changes 467 conflicting updates 459 merge() 411, 413, 425, 532 mergedItem 425 merging 388, 391, 424, 499 state 411 messages component 800 handle to a Java resource bundle 800 messages_de.properties 800 messages_en.properties 800 meta elements 93 metadata 123 deployment dependent 70 global 133 override 130 package 134 META-INF/ejb-jar.xml 788 metamodel 139 meta-type 319 method chaining 671 min() 655 minelement() 661 minindex() 661 mixing inheritance strategies 207 Model/View/Controller (MVC) 699 models, fine-grained 177 monitoring CollectionStatistics 59 EntityStatistics 59

Figure 19-4

By default, the graph of network activity for each connection scales dynamically to show how much network utilization there is when compared with the theoretical maximum for the connection. For example, on a 100 Mbps connection, when there is no network activity on a connection, the vertical scale on the graph shows the values 0 percent, .5 percent, and 1 percent of the theoretical maximum. As network activity increases, the graph scales to show a greater percentage up to 100 percent, indicating the full 100 Mbps potential. Because most people use this tab not to measure the exact network throughput, but rather to see whether there is network throughput (and sometimes what the maximum value is), this scale can be rather confusing. Fortunately, you have two options for controlling the way Task Manager displays the graph: