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JAVA SERVLET TECHNOLOGY
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The life cycle of a servlet is controlled by the container in which the servlet has been deployed When a request is mapped to a servlet, the container performs the following steps 1 If an instance of the servlet does not exist, the Web container a Loads the servlet class b Creates an instance of the servlet class method Initializac Initializes the servlet instance by calling the tion is covered in Initializing a Servlet, page (222) 2 Invokes the method, passing a request and response object Service methods are discussed in the section Writing Service Methods, page (223) If the container needs to remove the servlet, it finalizes the servlet by calling the servlet s method Finalization is discussed in Finalizing a Servlet, page (242)
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You can monitor and react to events in a servlet s life cycle by defining listener objects whose methods get invoked when life cycle events occur To use these listener objects, you must define the listener class and specify the listener class
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You define a listener class as an implementation of a listener interface Table 10 3 lists the events that can be monitored and the corresponding interface that must be implemented When a listener method is invoked, it is passed an event that contains information appropriate to the event For example, the methods in the
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The class creates and removes the database helper and counter objects used in the Duke s Bookstore application The methods retrieve the Web context object from and then store (and remove) the objects as servlet context attributes
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Table 10 3 Servlet Life-Cycle Events
Web context (See Accessing the Web Context, page (238))
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Initialization and destruction
Attribute added, removed, or replaced
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Session (See Maintaining Client State, page (239))
Attribute added, removed, or replaced
Event
SERVLET LIFE CYCLE
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JAVA SERVLET TECHNOLOGY
Specifying Event Listener Classes
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You specify a listener class for a WAR in the inspector (see Event Listeners, page (201))
Handling Errors
Any number of exceptions can occur when a servlet is executed The Web container will generate a default page containing the message when an exception occurs, but you can also specify that the container should return a specific error page for a given exception You specFile Refs inspector (see Error ify error pages for a WAR in the Mapping, page (201))