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As before, the place to start is the configuration of the persistence unit, which is chiefly in the creation of the persistence.xml file. We will outline the differences between creating a persistence.xml file for a Java SE application and creating one for a Java EE application.

When running in a server environment, the transaction-type attribute in the persistence unit defaults to being JTA. The JTA transaction layer was designed for use within the Java EE server and is intended to be fully integrated and coupled to the server components. Given this fact, JPA does not provide support for using JTA outside the server. Some providers may offer this support, but it cannot be portably relied upon, and of course it relies upon the JTA component being present. The transaction type does not normally need to be specified when deploying to Java SE. It will just default to being RESOURCE_LOCAL, but may be specified explicitly to make the programming contract more clear.

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J2ME Polish also provides a logging framework, which offers different logging levels and the ability to view logging messages on real devices. You can specify logging levels for packages and classes, and deactivate the logging completely, so that no precious space is wasted in the final application. You ll learn more about invoking emulators in 7, and you ll get to know the details of the logging framework in 9.

In this example, you re going to put a few U.S. cities on the map. First you re going to store the coordinates for the cities in an array. Then you re going to loop through that array to put each one of those on a map. Before you start learning how to do this, let s start with a clean plate. I m going to use the code in Listing 5-11 as a starting point for this example. Listing 5-11. A Fresh Start (function() { window.onload = function() { // Creating an object literal containing the properties // we want to pass to the map var options = { zoom: 3, center: new google.maps.LatLng(37.09, -95.71),

When we described configuration in the server, we illustrated how the jta-data-source element denotes the JNDI location of the data source that will be used to obtain connections. We also saw that some servers might even default the data source. The non-jta-data-source element is used in the server to specify where resource-local connections can be obtained in JNDI. It may also be used by providers that do optimized reading through non-JTA connections. When configuring for outside the server, not only can we not rely upon JTA, as we described in the transaction type section, but we cannot rely upon JNDI at all. We therefore cannot portably rely upon either of the data source elements in Java SE configurations. When using resource-local transactions outside the server, the provider obtains database connections directly vended out by the JDBC driver. In order for it to get these connections, it must obtain the driver-specific information, which typically includes the name of the driver class, the URL that the driver uses to connect to the database, and the user and password authentication that the driver also passes to the database. This metadata may be specified in whichever way the provider prefers it to be specified, but all vendors must support the standard JDBC properties in the properties section. Listing 13-15 shows an example of using the standard properties to connect to the Derby database through the Derby driver. Listing 13-15. Specifiying Resource-Level JDBC Properties <persistence-unit name="EmployeeService"> ... <properties> <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/> <property name="javax.persistence.jdbc.url" value="jdbc:derby://localhost:1527/EmpServDB;create=true"/> <property name="javax.persistence.jdbc.user" value="APP"/> <property name="javax.persistence.jdbc.password" value="APP"/> </properties> </persistence-unit>

When you implement and test your first prototype, you usually discover shortcomings that need to be fixed in the optimization phase. Typical shortcomings include the following: Device-specific bugs: You encounter bugs on some devices, but not on others. You can solve these problems by using preprocessing for circumventing device-specific bugs. 8 describes how to preprocess your application with J2ME Polish. In 15 you will learn what problems you might encounter in the real world and how you can solve them. Application size: Your application is too large. Usually, you can use automatic resource assembling to optimize resources usage and adjust your application s architecture. The automatic assembling of resources is discussed in 7. Application performance: The performance is not as good as expected. You can use a variety of techniques for improving your application s performance. 16 is devoted to optimization strategies.

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