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Handling life-cycle events |
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There is a way to handle events related to the initialization and destruction of JSP pages.
The initialization event occurs the first time the JSP container receives a request for a JSP page.
The destruction event occurs when the JSP container unloads the servlet class by any reason.
These events are handled by declaring special life-cycle methods that will automatically be called
by the JSP container when the corresponding event occurs.
...
<%!
static private DbConnectionPool pool = null;
////////////// The initialization event is handled by jspInit():
public void jspInit () {
// Initialization code goes here...
if (pool == null) {
String username = "...";
String password = "...";
pool = DbConnectionPool.getPool(this, username, password);
}
}
////////////// ... and the destruction event is handled by jspDestroy()
public void jspDestroy () {
// Destruction code goes here...
pool.maybeReclaim(this);
}
%>
...
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