【正文】 ad written plugins to work with Hibernate, since I39。ve found so far, the Hibernate Synchronizer interested me most because it seems to best support the kind of mappingcentric workflow I adopted throughout my Developer39。s New menu that provides wizards for creating Hibernate configuration and mapping files, and adds contextual menu entries in the package explorer and in other appropriate places, providing easy access to relevant Hibernate operations.OK, enough abstract description, time to get down to the practical stuff! After all, you were already probably interested in this, or you wouldn39。m still using the production release, . As I write this, Eclipse 3 has entered its release candidate phase, and I am very much looking forward to being able to upgrade to a production release of version 3 when I return from JavaOne later this summer. (The main reason I mention this is to emphasize that the following instructions are written from an Eclipse 2 perspective。re using a onebutton mouse) in the Feature Updates view and choose New Site Bookmark. Figure 1. Adding the Hibernate Synchronizer plugin site to the Update ManagerIn the resulting dialog, enter the URL for the version of the plugin that you need. The URL to be entered depends on your Eclipse version:Eclipse : Eclipse 3: You also need to assign a name for the new bookmark. Hibernate Synchronizer makes a lot of sense. Once you click Finish, the new bookmark will appear in the Feature Updates actually install the plugin, click on the disclosure triangle to the left of the bookmark, and again on the next one that appears inside of it, until you can see the icon for the plugin itself. When you click on that, the Preview view will update to show you an interface that allows you to install the Install Now to actually install it, and let Eclipse walk you through the TradeOffs, below, for some discussion about this license agreement. You may wish to read it carefully before deciding to use Hibernate Synchronizer in a project of your own. I think it39。s time to start configuring the plugin to put it through its paces! ConfigurationOnce Eclipse es back up, you can close the Install/Update perspective. Open a Java project that uses Hibernate. If you39。ll be looking at the examples as they exist in Chapter 3, which is the sample chapter available online. You can also download the source for all of the examples from the book39。t like to fit into a window small enough for a reasonable screen shot。ll need to replicate the contents of into a new file. On the bright side, this gives us our first opportunity to play with a feature of Hibernate Synchronizer, the configuration file wizard. Choose File New Other, click the newly available Hibernate category, pick Hibernate Configuration File, and click Next.When the wizard starts up, the directory it offers to put the file into depends on the file you39。d certainly be interested. I39。t need to put anything in your source code to request that the corresponding mapping gets set up. For now, let39。t know how to do it.) Filling in the Driver Class is a little strange: You need to click the Browse button, and start typing the driver name. If you type jdbcD, the window will present only two choices, and you can easily click the right one. You can click Finish to create the configuration file. Hibernate Synchronizer is now ready to use. It opens the file it created so you can see the structure and details of an XML configuration file for Hibernate.A quick way to test that the configuration is working is to play with the other wizard interface. Choose File New Other, click the newly available Hibernate category, pick Hibernate Mapping File, and click Next. When the wizard es up, it should be populated with the settings information we just entered, and you can click the Refresh button to make sure it can municate with the database and show you that it found a TRACK table. The first time you do this, you might have to confirm the location of the .jar file containing the HSQLDB driver, for some reason, but that seems to happen only once. In any case, once you confirm that everything seems to be working, click Cancel rather than actually creating the mapping, because we want to work with our handcreated mapping file that already exists. Generating CodeThis is probably the part you39。s be sure to put it at the toplevel src directory alongside the properties version, for consistency. Fill in the rest of the information requested by the wizard to match the properties version of the configuration, as shown in Figure 14. Notice that, unlike when using Ant to control the execution of Hibernate (which was the approach used in the Developer39。m going to have to work with partial window captures from this point on.The next thing we need to do is create a Hibernate configuration file that Hibernate Synchronizer can use. There is already a file in the src directory, which is how the examples in the book work, but Hibernate Synchronizer only works with Hibernate39。re creating a new Eclipse project to work with one of the example source directories, just choose File New Project, specify that you want to create a Java project and click Next, give it a name (Hibernate Ch3 in my case, as shown in Figure 11), uncheck the Use default checkbox so that you can tell Eclipse where to find the existing project directory, and hit the Browse button to locate where it exists on your own drive. At this point, you can click Finish to create the project, but I generally like to click Next and doublecheck the decisions Eclipse is making. (Of course, if it gets anything wrong, you can always go back and fix the project properties, but I tend to find it disconcerting to be greeted by a ton of errors and warnings immediately if there is a library missing or something.) In this case, my caution was unnecessary. Eclipse figured out exactly how the directory was structured and int