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<h2 class="first-section-title"><a name="505"></a><a name="ch15lev1sec2"></a>Presentation Layer Coding Guidelines</h2><p class="para">
<b>Keep every <span class="fixed">Action</span>, <span class="fixed">ActionForm</span>, and JSP thin.</b> They are difficult to debug if your company didn't buy tools that allow servlet debugging. You want as little conditional logic as possible. A layered architecture leads you to put all the complexity in the layers that are locally debuggable, like the business <a name="506"></a><a name="IDX-210"></a>and data access layers. If you use Javascript code, keep it thin for the same reasons.</p>
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<b>Action classes and JSPs should not use instance-level variables.</b> Otherwise, you have a good chance of getting incorrect behavior from your application because every instantiation of an action or JSP is used to service multiple users. In contrast, an <span class="fixed">ActionForm</span> can have instance-level variables.</p>
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