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<h2 class="first-section-title"><a name="507"></a><a name="ch15lev1sec3"></a>Common Mistakes</h2><p class="para">
<b>Putting business logic in JSPs or servlets.</b> Business logic tends to make JSPs and servlets more complex and difficult to maintain unless your organization buys development tools that allow interactive debugging. I've seen Web applications with all server-side code embedded in servlets.</p>
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<b>Declaring instance-level variables on servlets.</b> Don't consider servlets thread safe by default (even if you implement <span class="fixed">SingleThreadModel</span>). I've even seen a development team "synchronize" every method in the servlet in an attempt to compensate for the problems caused by declaring instance-level variables.</p>
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<b>Using no formal navigation control.</b> Without a formal control structure, presentation layer code is often unstructured and unorganized. It's usually harder to maintain. Besides Struts, another good presentation layer control package is Maverick (<a target="_top" class="url" href="http://mav.sourceforge.net/">http://mav.sourceforge.net/</a>).</p>
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