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You should consider system exceptions automatic rollback of transactions as a side effect rather than a means to an end. Application code should catch an application exception explicitly and roll back the transaction using either

Debug determines whether to display debugging information for this web part. MyPartOrder determines the order of this web part on the page. RunAsUser allows the web part to override the current user with a fixed user alias. Let s look at the code for the first of these properties: ADGroups. (The remaining properties are defined in a similar fashion.) A bit of decoration code precedes each property. <Browsable(True), Category("Base"), DefaultValue(_defaultText), _ WebPartStorage(Storage.Personal), FriendlyName("AD Groups"), _ Description("AD Groups with access to this webpart.")> _ The preceding clause modifies the property definition and defines which, if any, options the user has to modify this property from the web part property sheet. The following list gives the meaning of each clause.

setRollbackOnly() on the bean s context for CMTs or the UserTransaction for bean-managed transactions (BMTs). When you choose the correct exception type,

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Motorola may be more responsible for Android s popularity than any other phone manufacturer. The Motorola DROID was heavily advertised as a competitor to the iPhone, and it became the first truly drool-worthy Android phone to hit the market. DROID is also a straightforward Android offering without extra user interface software. Motorola s user interface enhancement is MOTOBLUR, also known simply as Blur. Blur is meant primarily as a social networking feature that combines feeds from e-mail messages and sites like Twitter, Facebook, and Flickr, and places the messages directly on the Home screen of the phone without requiring you to log into separate apps. MOTOBLUR also allows native syncing with Exchange e-mail accounts and has built-in support for remote wipe. That means if your phone is lost, your private data doesn t have to be vulnerable. (It s worth noting that, when I asked phone manufacturers about remote wipe on Android, Motorola was the only company that offered the feature out of the box.)

the container logs the correct exceptions, keeps the system logs clean, reuses resources properly, and awards beans the opportunity to clean up their state, when appropriate. When developers throw application exceptions and system exceptions appropriately, you know exactly the EJB-thrown exceptions you can handle and those that are beyond your ability to control. Consequently, you can implement robust retry logic for idempotent methods, in addition to any support the container already provides. If the application frequently throws application exceptions as system exceptions, retrying the method will always throw the same exception, and you can t sacrifice these superfluous invocations. On the other hand, when you only have to consider true system exceptions and programming errors, you can hope that the programming errors are rare enough that any resulting retries would have little impact on system performance and stability. Table 4.1 shows the causes and results of both applications and system exceptions to help you apply them appropriately.

Browsable(True) indicates that this property appears on the property sheet. Category("Base") appears in the Base section of the sheet. DefaultValue(_defaultText) displays as a textbox with default value initialized to the value of the variable _defaultText. WebPartStorage(Storage.Personal) stores the value of this property on a per-user basis. FriendlyName("AD Groups") the text prompt displays on the property sheet next to the textbox. Description ("...") displays the tooltip text if the user moves the cursor over the property. Next comes the property definition itself, which is simply a get/set routine that exposes a private variable: _AdGroups. Property ADGroups() As String Get Return _AdGroups End Get Set(ByVal Value As String) _AdGroups = Value End Set End Property The rest of the properties are defined in a similar fashion.

Table 4.1 Exception type matrix Exception types Checked Exceptions Causes Application-level events for example, trying to book a trip on an invalid date System-level exceptions, such as network and memory errors, and programming errors, such as unexpected NullPointerExceptions. Result The container throws the exception to the client. The container logs the exception, throws away the bean instance, rolls back the transaction, and throws remote clients a RemoteException and local clients an EJBException.

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