10 when even jstl is not enough: custom tag development sometimes jstl and standard actions aren’t...

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10 When even JSTL is not enough: custom tag development Sometimes JSTL and standard actions aren’t enough. When you need something custom, and you don’t want to go back to scripting, you can write your own tag handlers. That way, your page designers can use your tag in their pages, while all the hard work is done behind the scenes in your tag handler class. But there are three different ways to build your own tag handlers, so there’s a lot to learn. Of the three, two were introduced with JSP 2.0 to make your life easier (Simple Tags and Tag Files). But you still have to learn about Classic tags for that ridiculously rare occasion when neither of the other

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Page 1: 10 When even JSTL is not enough: custom tag development Sometimes JSTL and standard actions aren’t enough. When you need something custom, and you don’t

10 When even JSTL is not enough: custom tag development

Sometimes JSTL and standard actions aren’t enough. When you need something custom, and you don’t want to go back to scripting, you can write your own tag handlers. That way, your page designers can use your tag in their pages, while all the hard work is done behind the scenes in your tag handler class. But there are three different ways to build your own tag handlers, so there’s a lot to learn. Of the three, two were introduced with JSP 2.0 to make your life easier (Simple Tags and Tag Files). But you still have to learn about Classic tags for that ridiculously rare occasion when neither of the other two will do what you want. Custom tag development gives you virtually unlimited power, if you can learn to wield it...

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Objects of the Chapter

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