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Introducing EJB modules Creating an EJB module node for an existing archive outside your project You can create an EJB module node for an existing EJB archive (JAR) that is outside your current project. Although you will be able to view the contents of the archive using the EJB Module DD editor, you won t be able to edit it. The module node will be read only. You also won t be able to build it, but you will be able to deploy it. To create an EJB module node for an EJB JAR outside your project, 1 Select the Create EJB Module For An Existing Directory Or Archive. 2 Use the ellipsis ( ) button to browse to the location of the existing archive. 3 Click Next to go to the next page: 4 Specify the name you want to use as the name of the EJB module for the Name field. The default name will be the name of the archive with the extension as a separate word at the end, such as MyEJBModule JAR. 5 Choose Finish. The new EJB module appears in the project pane. Double-click the EJB module node in the project pane to display the EJB designer. For example, if you chose to create an empty EJB module for a project named EJB2_Project and you specified NewEJBModule as the name of the JBuilder UI would look like this: Creating an EJB module from existing deployment descriptors There is another way to create an EJB module for existing beans without using the EJB Module wizard. If you already have existing EJB deployment descriptors for enterprise beans you created previously, you can also create a new EJB module for those beans Chapter 4: Working with the EJB designer 21
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Introducing EJB modules 6 From the Build EJB Archive drop-down list, select when you want the EJB archive to be built. 7 Select which EJB specification you are using from the options in the Available Standards box. Note Only the EJB standards your server supports appear in the Available Standards box. 8 Add any necessary source path for any Java files associated with the module. 9 Choose Finish. Creating an EJB module node for a module existing in a directory outside your project You can use an existing module in a directory outside your project; you don t have to copy it to your current project: 1 Select the Create EJB Module For An Existing Directory Or Archive on the first page of the EJB Module DD editor. 2 Use the ellipsis ( ) button to browse to the location of the directory that contains the module. A META-INF folder must exist under this directory, which should contain the descriptors for the module. 3 Click Next. 4 Specify a name to identify the new module in the Name field. 5 From the Build EJB Archive drop-down list, select when you want the EJB archive to be built. 6 Use the Add button to add the source path for any Java files associated with the module. You might want to add Java source paths that are necessary to build a module. It isn t absolutely necessary to add the source paths in this wizard, however. You can also add additional source path directories to your project directly. If you choose to add the source path directories using the EJB Module wizard, the directories you specify will be added to your project source path. If JBuilder can t locate your EJBs using the existing project source path(s), you won t be able to use the EJB designer for those beans. 7 Choose Finish. 20 Developing Applications with Enterprise JavaBeans
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Introducing EJB modules No matter which method you choose to create an EJB module using the EJB Module wizard, you ll see the new EJB module node appear in the project pane when you are done with the wizard. Creating an empty EJB module If you want to create a new empty EJB module, 1 Select the Create Empty EJB Module option on the first page of the EJB Module wizard. 2 Click Next to see Step 2: 3 Specify a name to identify the new module in the Name field. The default will be the name of the selected directory. 4 Specify a directory name for the Directory field. This is the directory that will contain the module. By default, the wizard uses the same name for the directory as the name you specified in the Name field. You can use the ellipsis ( ) button to navigate to a directory you want to use instead, if you choose. 5 From the Build EJB Archive drop-down list, select when you want the EJB archive to be built. 6 Select which EJB specification you are using from the options in the Available Standards box. Note Only the EJB standards your server supports appear in the Available Standards box. 7 Click Finish. Copying an existing EJB module You can use an existing EJB module by copying it to your current project with the EJB Module wizard: 1 Select the Copy EJB Module From A Directory Or Archive option on the first page of the EJB Module wizard. 2 Use the ellipsis ( ) button to browse to the location of the directory or archive that contains the module or archive you want to copy to the your project. 3 Click Next. 4 Specify a name to identify the new module in the Name field. 5 Specify a directory name for the Directory field. By default, the wizard uses the same name for the directory as the name you specified in the Name field. You can use the ellipsis ( ) button to navigate to a directory you want to use instead, if you choose. Chapter 4: Working with the EJB designer 19
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Introducing EJB modules for building your EJB JAR. You can edit the content of an EJB module using the EJB DD editor or by hand. Once you have an EJB module and have edited it to your liking with the EJB Module DD editor, you can choose the Make or Build command to produce the JAR. JBuilder uses the deployment descriptor to help identify the class files to be packaged. You can have more than one EJB module in a project. All the EJB modules in a single project use the same project classpath and JDK, and they are configured for the same target application server. If you haven t done so already, follow the instructions in the chapter Configuring the target server settings in Developing Applications for J2EE Servers. Creating an EJB module with the EJB Module wizard To create an EJB module, you use JBuilder s EJB Module wizard. Besides creating a new empty EJB module, the EJB Module wizard also gives you the option to copy an existing EJB module to your project instead of creating a new one. You can also use the wizard to create a module node in the project pane that represents an existing module directory outside your project. Or you can use it to create a module node that represents an archive (.jar) outside your project; you can view the archive using the EJB Module DD editor and the EJB designer, but you won t be able to edit it. To begin creating an EJB module, 1 Choose File|New and click Enterprise|EJB to display the EJB page of the object gallery. 2 Double-click the EJB Module icon and the wizard appears: If you don t have an open project before you begin the EJB Module wizard, the Project wizard appears first. After you create a new project, the EJB Module wizard then appears. Also, if you haven t selected a server for your enterprise bean development as explained in the Configuring the target server settings chapter of the Developing Applications for J2EE Servers book, a Select Server Supporting EJB Service page also appears before the EJB Module wizard starts. For help using that page to select a server, click the Help button in the dialog box. 3 Decide whether you are creating an empty EJB module that you will fill in later, if you are copying an existing EJB module from a directory or archive, if you are creating a module node that represents an EJB module in a directory outside your project, or if you are creating a module node that represents an archive (.jar). Because your selection determines the behavior of the wizard, the next sections describe how to use the wizard depending on the task you want to accomplish. 18 Developing Applications with Enterprise JavaBeans
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Chapter 4 Working with the EJB designer JBuilder s EJB designer provides a rapid application development (RAD) environment for EJB development. The EJB designer is a true Two-Way Tool that allows you to design your enterprise bean visually as JBuilder generates the code from your design. You can make changes to your design either through the EJB designer, or by editing the generated source code directly. Your source code and your design remain synchronized. As you work with the EJB designer, your deployment descriptors are being created for you, preparing your bean for deployment to your target application server. Introducing EJB modules Each enterprise bean you create with the EJB designer must belong to an EJB module. An EJB module is a logical grouping of one or more EJBs that will be deployed in a single JAR file. An EJB module encapsulates information used to produce the JAR file. Essentially it is a directory underneath your project that contains all the necessary files Chapter 4: Working with the EJB designer 17
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16 Developing Applications with Enterprise JavaBeans
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The EJB Module DD editor The EJB Module DD editor JBuilder includes a Deployment Descriptor editor, also called the EJB Module DD editor, you can use to change deployment information such as transaction policies and security roles in EJB deployment descriptors. As you use the EJB designer and other EJB wizards to create your beans, the beans deployment descriptors are also being created for you. You will need to edit them to modify the resulting deployment descriptors to your liking. You can also use the EJB Module DD editor s validator to insure your final deployment descriptors are correct. For information about using the EJB DD editor, see Chapter 13, Editing EJB deployment descriptors. The development process The next few chapters explain in depth how to use the JBuilder wizards, designers, and tools that make it easier and quicker to create your enterprise beans. It assumes that you understand what enterprise beans are, how they work, and what they require. If your EJB knowledge is limited or you want more information about EJB development before you begin using JBuilder s EJB wizards and tools, start reading Chapter 15, Developing session beans and the chapters that follow it before beginning this chapter. Developing enterprise beans with JBuilder has several steps. The references below, each which corresponds to one step in the process, are listed in the order you will most likely take in your development procedure: 1 Configuring the target server settings in Developing Applications for J2EE Servers 2 Introducing EJB modules on page 17 3 Chapter 5, Creating session beans with the EJB designer and Chapter 6, Creating entity beans with the EJB designer or Creating an enterprise bean on page 72 and Chapter 9, Creating EJB 1.x entity beans from an existing database table. 4 Chapter 10, Compiling enterprise beans and creating a deployment module 5 Chapter 13, Editing EJB deployment descriptors 6 Chapter 11, Running and testing an enterprise bean 7 Deploying to an application server on page 112 Chapter 3: Developing enterprise beans with JBuilder 15
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The EJB wizards The EJB wizards The object gallery has EJB wizards that help you get started creating enterprise beans. To see the EJB wizards in the object gallery, choose File|New and double-click the Enterprise|EJB node in the tree on the left: EJB Module and EJB designer wizards Each enterprise bean you create must belong to a JBuilder EJB module. An EJB module is a logical grouping of one or more beans that will be deployed in a single JAR file. An EJB module contains the information that represents the context of the EJB JAR file. Before you begin creating beans, you must use either the EJB Module wizard or the EJB designer wizard to create an EJB module. The wizards can create an EJB 2.1, 2.0 or 1.1 module. Once your module exists, you can begin building your beans with the EJB designer or the Enterprise JavaBean 1.1 wizard. Note Although JBuilder supports EJB 2.1 beans, this support is available only with servers that support J2EE 1.4 and have a JBuilder plug-in. For information about creating and working with EJB modules, see Introducing EJB modules on page 17. EJB 1.x wizards Although the EJB designer can now create EJB 2.1, 2.0 and 1.1 beans, you ll want to use the Enterprise JavaBean 1.x wizard or the EJB 1.x Entity Modeler for creating entity beans with bean-managed persistence (BMP). Also, if the entity bean you are creating has relationships to other entity beans, choose the EJB 1.x Entity Modeler rather than the EJB designer to develop your bean. Beans created using the 1.x wizards can be modeled using the EJB designer. For information about using the EJB 1.x wizards, see Chapter 8, Creating beans with the Enterprise JavaBean 1.x wizard and Chapter 9, Creating EJB 1.x entity beans from an existing database table. EJB Test Client wizard Once you ve created an enterprise bean, you ll want to be sure it is working properly. JBuilder provides an EJB Test Client wizard that can create a test client that calls the methods in your bean. The wizard can create a simple application test client, a JUnit test case, or a Cactus JUnit test case. See Chapter 11, Running and testing an enterprise bean for complete information about using the EJB Test Client wizard. 14 Developing Applications with Enterprise JavaBeans
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The EJB designer For complete information about working with the EJB designer, see Chapter 5, Creating session beans with the EJB designer and Chapter 6, Creating entity beans with the EJB designer. EJB designer options Be sure to see the EJB designer page of the Preferences dialog box for important options that can change the behavior and appearance of the EJB designer. To display the EJB designer page of the Preferences dialog box, choose Tools|Preferences and double-click EJB designer in the tree on the left: Here are brief descriptions of options you don t want to overlook: Always Regenerate Interfaces When checked, this option automatically regenerates the home/local home and remote/local interfaces for an enterprise bean when you modify the source code of the bean class directly. For example, if you are working in the source code and add a new method, JBuilder regenerates the bean s interfaces automatically to reflect the new method you made. Dirty Module On Layout Changes Determines whether all changes to the EJB designer layout are automatically saved. Uncheck this option if you find that when working with the EJB designer, you are inadvertently moving bean representations around. Prepend Schema Names To Table Names If the data source from which you are creating entity beans has a schema name, you can check this option to preface the table names with the schema names in all views in the EJB designer. Only Expand Selected EJBs When checked, all EJBs in the EJB designer are collapsed (only the name of the EJB appears in the bean representation). When you select an EJB in the EJB designer, it is expanded so you can see all fields, methods, and so on. Lazily Load EJBs This option is available only if you have checked the Only Expand Selected EJBs option. When checked, the EJBs in the EJB designer are loaded into memory only as they are required (when they come into view). Choosing this option can improve the initial display of the EJB designer that contains several beans. Route Relationship Lines Determines whether the EJB designer attempts to find the best route as it draws relationship lines. When it is unchecked, the lines are drawn in a straight line. If your project is large with many enterprise beans, you might find that unchecking this option improves the performance of the EJB designer. Chapter 3: Developing enterprise beans with JBuilder 13
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The EJB designer To display the Configure Servers dialog box, choose Enterprise|Configure Servers: For information about using the Configure Servers dialog box, see Configuring the target server settings in the Developing Applications for J2EE Servers book. The EJB designer At the center of enterprise bean development within JBuilder is the EJB designer, which provides a rapid application development (RAD) environment for EJB 2.0 and 1.1 development. The EJB designer is a true Two-Way Tool that allows you to design your enterprise bean visually as JBuilder generates the code from your design. You can make changes to your design either through the EJB designer, or by editing the generated source code directly. Your source code and your design remain synchronized. As you work with the EJB designer, your deployment descriptors are being created for you, preparing your bean for deployment to your target application server. 12 Developing Applications with Enterprise JavaBeans
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