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Like a Map or Hashtable, a session stores only objects, so when they re retrieved, they must be cast into the appropriate type Primitives contained in wrapper classes must be extracted by the methods provided in the wrapper class:

14:

Integer countObject = (Integer) getAttribute("count"); int count = countObjectintValue();

Usually, if you stored an attribute in a session, you know its name and type, and you can request it directly in this manner You can also get a list of attribute names, however, from the getAttributeName() method:

outprintln("Objects in this session:"); outprintln("<PRE>"); Enumeration enames = sessiongetAttributeNames(); while (enameshasMoreElements()) { String name = (String) enamesnextElement(); Object value = sessiongetAttribute(name); outprintln(name + " = " + value); } outprintln("</PRE>");

When an object is no longer needed, it can be removed from the session with removeAttribute():

JSP IN ACTION sessionremoveAttribute("jspcrsessionsmyappuser");

If we have a stored procedure selecting a set of rows, we can use the same technique to produce a method, calling that stored procedure and returning a collection of objects:

This happens automatically when the session is closed, but situations may occur when an attribute needs to be removed earlier than this

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Once created, a session ordinarily persists until it times out or is shut down Timeout refers to the maximum length of time between requests that the session will remain valid This is an important consideration because the server has no way of knowing whether a client has finished working with a session, other than by being told explicitly or by waiting a fixed length of time The default timeout interval can be set in the deployment descriptor webxml:

the risk the same way regardless of the outcome of their last trade or their last 10 trades The same traits people exhibit in their professional and social lives will show up in their trading habits The good thing about discipline, as any drill sergeant will tell you, is that it can be taught Often the hardest things for people to do are to have the discipline to evaluate themselves honestly and identify their weaknesses If they can come to terms with that and come up with a plan to discipline themselves, they are on their way to becoming successful in more than just trading To simplify things, remember that the only goal a trader should have is to have the discipline to follow her trading plan, which we will be covering shortly Discipline also means always using a stop-loss order, which is an order that is entered after you initiate a position that automatically will take you out of that position with a loss if the market moves against you We will cover Stop-loss orders in more detail in 12 It is impossible for us to talk to you about trading without making sure you know how to use stoploss orders

The interval is specified as a number of minutes, 30 being the default The value entered here applies to all sessions in the application unless they individually override it

Some applications that use scarce resources like database connections may choose to time out sooner These applications can use the setMaxInactiveInterval() method to select a shorter time period:

sessionsetMaxInactiveInterval(180);

The argument supplied to setMaxInactiveInterval() is a number of seconds4 The previous example uses 180 seconds or three minutes The current value can be obtained with getMaxInactiveInterval() If a negative value is specified, the session never times out In some cases, a definite end to the session can be provided In these cases, the invalidate() method can be used:

sessioninvalidate();

This method marks the session as being inactive and unbinds all objects bound to it For example, in a shopping cart application that uses a session to store items being ordered, after the checkout logic writes the order to a database, the session should be destroyed so, if the user purchases more items, the old session contents won t still be there

The session API can handle all the session tracking tasks described earlier in this chapter In this section, you learn how the hidden fields, URL rewriting, and cookies examples can be done using the same session API approach

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