This week's book giveaway is in the Agile and other Processes forum. We're giving away four copies of The Mikado Method and have Ola Ellnestam and Daniel Brolund on-line! See this thread for details.
Hello, I am trying to develop a simple shopping cart using JSP(using Tomcat 3.1). I have generated CheckBoxes , which when checked , the corresponding items are selected. I am retrieving those values through the following commands. : String basket[]=request.getParameterValues("c1"); out.println("<hr>Items selected "+basket.length); : This works fine only when 1 or more items are selected. If however , NO items are selected (i.e no checkboxes are checked) than I get a NullPointer exception. The reason for this is basket.length!!! But why ? Why cant I simply get an output as follows? Items selected null Thanx in Advance
maha anna
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Joined: Jan 31, 2000
Posts: 1467
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Milan, This is a very common and famous experience which I think all java people encounter. The best practice of java coding is, before you invoke any method on a reference, check if the reference is NOT NULL and then do the other checks. This is where the '&& CONDITIONAL CHECK' comes for help. Just change your code slightly like this. Now you won't get NullPointerException. regds maha anna
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experience which I think all 