Tutorials : Six Steps to Faster J2EE Apps: Performance Tuning with JSP and Servlets :

Six Steps to Faster J2EE Apps: Performance Tuning with JSP and Servlets

by Sridhar M S

Can your J2EE application sustain a large number of client requests simultaneously? Or does it become sluggish, with painfully slow response times? There are many reasons for such performance bottlenecks and many ways to prevent them. However, sometimes it's just a matter of following some simple best practices that can make all the difference. The following are six simple changes you can make, some in the design and some in the coding phases, that can help you build faster, more robust applications.

Step 1: Adopt the Correct Include Mechanism

There are two ways you can include files in a JSP page:

1. Include directive (<%@ include file="test.jsp" %>): This includes the contents of the file during the compilation phase—i.e., when the page is converted to a servlet.
2. Include action (<jsp:include page="test.jsp" flush="true" />): This includes the contents of the file in the run-time—i.e., when a request is made for the page by the user.

Step 2: Use the Correct Scope in the useBean Action

Below is the syntax:

<jsp:useBean id="name" scope="request|page|session|application"
class="package.className" type="typeName">
</jsp:useBean>

For example, if the bean that you are using is required only for a particular request, but scope is set to session, that object will remain in the memory even after your request is complete. The object will exist in the memory until you explicitly remove it invalidate the session, or, in the case of time-outs, the session.

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