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// the normal MIDP 1.0 splash screen, // this class resides in source/midp1: package com.apress.folders; import javax.microedition.lcdui.*; public class Splash extends Canvas { public void paint( Graphics g ) { g.drawString("Starting!", getWidth()/2, getHeight()/2, Graphics.HCENTER | Graphics.BASELINE ); } } // the MIDP 2.0 splash screen, // this class resides in source/midp2: package com.apress.folders; import javax.microedition.lcdui.*; public class Splash extends Canvas { public void paint( Graphics g ) { setFullScreenMode( true ); g.drawString("Starting!", getWidth()/2, getHeight()/2, Graphics.HCENTER | Graphics.BASELINE ); } } // the Nokia UI API splash screen, // this class resides in source/nokiaui: package com.apress.folders; import javax.microedition.lcdui.*; import com.nokia.mid.ui.FullCanvas; public class Splash extends FullCanvas { public void paint( Graphics g ) { g.drawString("Starting!", getWidth()/2, getHeight()/2, Graphics.HCENTER | Graphics.BASELINE ); } } Every serious Java IDE supports several source folders for one project. In Eclipse you can add source folders by right-clicking the project, selecting Properties, and then selecting Java Build Path, as shown in Figure 15-2. On the Source tab, click Add Folder to add another source folder. You should, however, not do this when you want to implement the same classes several times. In that case, your IDE would (correctly) complain about duplicate class definitions. Just use one main source folder (such as source/src), and add the other source folders to the parent directory, such as source/midp2, source/nokiaui, and so on. Another strategy is to use different projects in your IDE that contain the different sources.

The configuration that describes the persistence unit is defined in an XML file called persistence.xml. Each persistence unit is named, so when a referencing application wants to specify the configuration for an entity it needs only to reference the name of the persistence unit that defines that configuration. A single persistence.xml file can contain one or more named persistence unit configurations, but each persistence unit is separate and distinct from the others, and they can be logically thought of as being in separate persistence.xml files.

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Many of the persistence unit elements in the persistence.xml file apply to persistence units that are deployed within the Java EE container. The only ones that we need to specify for our example are name, transaction-type, class, and properties. There are a number of other elements that can be specified in the persistence unit configuration in the persistence.xml file, but they will be discussed in more detail in 13. Listing 2-11 shows the relevant part of the persistence.xml file for this example. Listing 2-11. Elements in the persistence.xml File <persistence> <persistence-unit name="EmployeeService" transaction-type="RESOURCE_LOCAL"> <class>examples.model.Employee</class> <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> </persistence> The name attribute of the persistence-unit element indicates the name of our persistence unit and is the string that we specify when we create the EntityManagerFactory. We have used EmployeeService as the name. The transaction-type attribute indicates that our persistence unit uses resource-level EntityTransaction instead of JTA transactions. The class element lists the entity that is part of the persistence unit. Multiple class elements can be specified when there is more than one entity. They would not normally be needed when deploying in a Java EE container because the container will scan for entities automatically as part of the deployment process, but they are needed for portable execution when running in Java SE. We have only a single Employee entity. The last section is just a list of properties that can be standard or vendor-specific. The JDBC database login parameters must be specified when running in a Java SE environment to tell the provider what resource to connect to. Other provider properties, such as logging options, are vendorspecific and might also be useful.

Figure 15-2. Adding a new source folder to an Eclipse project The main drawback of using different source files is the additional work that is needed for each change. Depending on the business requirements, you might need to create loads of different Java source files. When you now need to include an additional feature or bug fix, you need to implement the change in every affected source file.

Note The mapTypeControlOptions value is an object literal with different properties instead of just a single value. This construction might seem a little cumbersome at first, but it s actually really clever. Having it constructed this way, it s easy to add more properties as the API evolves. Right now, it has three properties: style, position, and mapTypeIds. When I started experimenting with the API, it had only one property, style.

TIP The names of the four JDBC properties (javax.persistence.jdbc.*) were standardized in JPA 2.0. Previous to that, a provider chose its own property names and documented what users needed to specify in order to connect to a JDBC data source.

Typically, you will encounter similar problems in your projects. In the following sections, I will discuss how you can resolve common difficulties.

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