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The three most important are the Message property, which describes the exception and may point you to a resolution, the StackTrace, which pinpoints the exact execution point where the exception occurred, and the InnerException property, which helps chain multiple exceptions together Most exception objects have additional properties that can help pinpoint specifics about why an error occurred For instance, the FileNotFound Exception has a FileName property to identify the file that could not be found, and the SqlException has properties to help identify the line number on which a T-SQL statement failed and the database server on which the error occurred To see a listing of all the exceptions in the NET Framework, you can select Debug Exceptions This displays the Exceptions window Expand the Common Language Runtime Exceptions node to see a list of namespaces in the NET Framework.

Let s fire the emulator and play some Asteroids! Here is how: 1. 2. 3. Create a new launch configuration. From the Eclipse main menu, click Run Run Configurations. Enter a configuration name, Asteroids. Select the project, ch04.Asteroids.

You can then expand a namespace to see which exceptions reside in the namespace This window also allows you to tell the debugger to break when a specific type of exception occurs, or when it is unhandled, by checking the appropriate check box next to the exception name..

When your application throws an exception, your code can handle the exception in a Try Catch Finally block. The Try section surrounds a block of code that could produce an exception and, if that code produces an exception, the runtime jumps down into the Catch section to handle

So far we have seen Appender objects that can publish and store logging information locally to a console or a file. It is often also important to be able to distribute the logging information, by sending logging information to a database or to a remote machine, for example. Apache log4j provides other Appender objects to do the job, which I will discuss next.

the exception accordingly. Look at the following function in Listing 2-1 to see an example of using a Try Catch block (line numbers are for reference only). Listing 2-1. Try Catch Statement Example #1 01: '*************************************************************************** 02: Public Function IntegerDivide(ByVal N As Long, ByVal D As Long) As Long 03: Try 04: Dim ReturnValue As Long 05: ReturnValue = (N \ D) 06: Return ReturnValue 07: Catch ex As Exception 08: Return 0 09: End Try 10: End Function This function takes a numerator (N) and a denominator (D), and returns the result of an integer division operation. Normally, the code creates a temporary variable, stores the result of the (N \ D) operation in that temporary variable, and returns the temporary variable as the result of the function. However, it s possible that someone could errantly pass the value 0 in for D, which results in a System.DivideByZeroException being thrown from line 5. If this exception is thrown, execution flow skips the rest of the code in the Try block and immediately jumps down into the Catch block on line 7. The Catch block is where you can remedy the exception, if possible. The remedy used in this function is to return 0 if an exception occurs.

Stand by for the emulator window. You should see the game starting with the message Game Over and some asteroids floating around the screen. Press S to start the game and try some of the game s features (see Figure 4-5): Move the ship around using the arrow keys. You should see the thrusters fire and hear the thrusters sound. The ship should wrap around when it goes off the screen. Press the space bar to fire the gun. Make sure the photons display (and that the sound plays) and the asteroids are destroyed when hit. Press the H to jump into hyperspace. The ship should disappear and reappear in a random location. Make sure the sound effect is played. Try to get a high score, and make sure the UFO shows up on screen and fires the missile against you. Press E to terminate the game when you get bored.