Preparing JBoss, Derby, and XDoclet in Java

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Preparing JBoss, Derby, and XDoclet
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You will use the JBoss application server, the Derby database, and XDoclet to develop CMP beans for League Planet Do the following to prepare your environment: 1 Make sure that you have JBoss and Derby installed and XDoclet configured in your workspace You can refer to 3 and/or 8 if you need more information 2 Set up Derby to run in client/server mode EJB containers typically access a database using pooled resources and data source objects Data sources allow servers to share database resources efficiently so that multiple objects can connect concurrently to Derby over the network Running Derby in networked mode is quite simple On a Windows machine you can use the startup script shown in Example 96 To stop Derby, you can simply kill the process
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Example 96 Start Derby
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set DERBY_INSTALL=C:\derby call "%DERBY_INSTALL%"/frameworks/NetworkServer/bin/setNetworkServerCPbat call "%DERBY_INSTALL%"/frameworks/NetworkServer/bin/NetworkServerControlbat call "%DERBY_INSTALL%"/frameworks/NetworkServer/bin/startNetworkServerbat
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Derby will start as a server on the default port 1527 and will wait to accept connections See the Derby documentation for more information on how to start and stop Derby as a server
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CHAPTER 9 The Persistence Tier
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3 JBoss keeps default database configurations in the server deploy directory Assuming you are working with defaults, this will be the JBOSS_HOME/ server/default/deploy directory under your JBoss installation JBoss provides an example configuration for the Hypersonic database, which can be found in the file named hsqldb-dsxml Create a similar configuration for Derby in a file named derby-dsxml (see Example 97)
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Example 97 Derby Database Configuration
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< xml version="10" encoding="UTF-8" > <datasources> <local-tx-datasource> <jndi-name>LeagueDS</jndi-name> <connection-url>jdbc:derby://localhost:1527/leagueDB</connection-url> <driver-class>orgapachederbyjdbcClientDriver</driver-class> <user-name>test</user-name> <password>test</password> <min-pool-size>5</min-pool-size> <max-pool-size>20</max-pool-size> <idle-timeout-minutes>5</idle-timeout-minutes> </local-tx-datasource> </datasources>
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JBoss will need a copy of derbyclientjar, which contains the Derby JDBC drivers Copy this file from the Derby installation folder into this JBoss directory: JBOSS_HOME/server/default/lib When JBoss starts, it will automatically configure the connection to the League Planet database Remember the name of the data source, LeagueDS, since you will need it to set up XDoclet 4 In the Project Explorer view, locate the LeaguePlanetEJB project that was created previously (see 8) If you do not have the project, follow the instructions to create it now (see the Iteration 2: Developing Session EJBs section) Alternatively, you can import the project from the source code examples provided with the book 5 Configure XDoclet CMP preferences for this project Right click on the LeaguePlanetEJB project and open the project Properties dialog Click on the XDoclet property XDoclet is set up to use global workspace preferences by default Uncheck Use global xdoclet preferences and click Apply (see Figure 915) 6 Click on the ejbdoclet item on the left side XDoclet can generate JBossspecific annotations and deployment descriptors This example requires JBoss, so check JBoss and click Apply (see Figure 916)
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Iteration 3: Entity Beans
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Figure 915 XDoclet Properties
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7 While JBoss is selected, click on the Edit button JBoss preferences provide default values for generated code Later on, you can modify these values for each CMP Enter java:/LeagueDS as the data source name and Derby as the default datasource mapping Make sure that createtable and altertable are checked These instruct the JBoss EJB container to automatically create or alter existing tables in the database (see Figure 917) Click Finish, and click OK to close the project properties window
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CHAPTER 9 The Persistence Tier
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Figure 916 EJBDoclet Preferences
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You have now completed the preparation of JBoss, Derby, XDoclet, and the EJB project You can now proceed to the next step and add CMP beans
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Adding a CMP
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Add a CMP to the LeaguePlanetEJB project as follows: 1 To create a CMP, select the LeaguePlanetEJB project in the Project Explorer Right click and invoke the New XDoclet Enterprise JavaBean menu item The XDoclet EJB wizard opens (see Figure 918) 2 Select ContainerManagedEntityBean and click Next Enter
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comleagueplanetcmp
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Iteration 3: Entity Beans
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Figure 917 JBoss Preferences
as the Java package and GameBean as the class name Remember that XDoclet needs you to use the suffix Bean for class names and avoid using other suffixes such as Session, Entity, CMP, or BMP Leave the superclass as Object (see Figure 919) 3 Click the Next button The next page allows you to enter initial attributes of the CMP bean Leave the EJB name as Game and the schema name as GameSCHEMA You can use the CMP wizard to define bean attributes from scratch or import attributes from an existing table in a database When you import attributes from a database, the wizard will use the database connections previously defined (see Figure 920) You can also create a new connection Leave all the default settings (see Figure 921) 4 Click the Next button The next page allows you to review CMP attributes