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Now the reference to the session bean can invoke any number of methods. The container ensures that there is a bean instance reserved for a user session and that the bean instance is not shared between multiple user sessions. Be sure to remove the EJB object from the HttpSession when you are invoking a method that is annotated with @Remove. Here s the code that removes the bean instance from the session:

5

There s nothing in C# that stops you from creating a mutable value type. It is just a bad idea (in general). If your type is mutable, it is probably safer to make it a reference type, by declaring it as a class. Mutable value types cause problems because of the copy semantics if you modify a value, it s all too easy to end up modifying the wrong one, because there may be many copies.

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After you ve recon gured your existing SBS to use a single network card, you need to reconnect it to the Internet. You need to insert a router into the network, if you don t already have one, and con gure it for the network address range that you ve chosen for your SBS network. In many cases, you ll already have a router in place we did. But that router is likely not a full- edged rewall. Now is the time to replace it or add an additional rewall appliance. When you do, you ll need to con gure the rewall for your SBS network. The ports SBS 2003 uses include:

Coalesce()

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The contract for our chat service is a one-sided affair it s all about the notes the client sends to the server. But WCF supports duplex contracts, which provide a means for the server to call the client back. (Note that there are some issues with HTTP that can make duplex communication tricky see the sidebar on the next page.) A duplex contract involves two interfaces as well as an interface that the server implements, we also define an interface that the client must implement if it wants to use the service. In our example, the service wants to notify clients whenever any user posts a note. So the client-side interface, shown in Example 13-8, looks pretty similar to our current server interface.

The SQL error is caught by Hibernate and converted into an optimistic locking exception you can then handle in application code. Other options for the check attribute are as follows:

Note One limitation of the Build Details window is that once the Build Steps section reaches a certain length (around 65,000 pixels) the rest of the window is truncated. Although it is not possible to view the truncated build steps, you can still minimize the Build Steps section to access the Associated Changesets and Associated Work Items sections.

ActionBazaar is a simple online auctioning system like eBay. Sellers dust off the treasures hidden away in basement corners, take a few out-of-focus pictures, and post their item listings on ActionBazaar. Eager buyers get in the competitive spirit and put exorbitant bids against each other on the hidden treasures with the blurry pictures and misspelled descriptions. Winning bidders pay for the items. Sellers ship sold items. Everyone is happy, or so the story goes. As much as we would like to take credit for it, the idea of ActionBazaar was first introduced in Hibernate in Action by Christian Bauer and Gavin King (Manning, 2004) as the CaveatEmptor application. Hibernate in Action primary dealt with developing the persistence layer using the Hibernate object-relational mapping (ORM) framework. The idea was later used by Patrick Lightbody and Jason Carreira in WebWork in Action (Manning, 2005) to discuss the open source presentation-tier framework. We thought this was a pretty good idea to adopt for EJB 3.

The Finish screen has two buttons in the upper-right corner: Site, which links to the main site, and Admin, which links to the Administrator portion of the site. Right-click the Admin button and open the link in a new window. Then return to the main window and click the Site button. With the Administrator interface open in one window and the main user interface in the other, you can easily flip back and forth between them. With a simple browser refresh, you ll instantly see the results of any changes made to the main user interface in the Administrator interface.

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