James McGovern

I'm developing an Internet application where the user can register. How would i check if the e-mail address entered is valid? I have a couple of ideas you can implement. First, I suggest using JavaScript in the browser to check for allowable characters by scanning the input. The JavaScript could also look for a single instance of the @ character and at least one period. For a list of all allowable characters go to www.faqs.org/rfcs/rfc822.html. Now for the server side. Make sure (1) the e-mail address is syntactically correct, and (2) the supplied domain name is valid. The reason is that we can't ascertain whether an e-mail address is truly valid until we send e-mail to it. Let's take a look at some sample code that performs the JavaScript equivalent on the server. imp... (more)

Extreme Performance Tuning

Many development shops have used J2EE to build a successful business-logic tier but have fallen short on obtaining the desired look and feel. On my current project we considered using applets as substitutes for GIF-based buttons, creating a utility to modify tree-based structure data as well as an application that will allow a secure file-based transmission. In my spare time I'm also wor... (more)

Enterprise Architecture & Open Source

Enterprises often resort to costly, inflexible, solutions from proprietary vendors as they look to build or upgrade infrastructure for deploying and managing business applications. Use of open source software within the enterprise is gaining traction in the minds of architects. This movement is being fueled by the need in today's economy to make IT become more cost-effective while provid... (more)

Extreme Performance Tuning

The performance of J2EE-based applications sometimes doesn't live up to users' expectations. Usually it's impossible to quantify exactly where the bottlenecks are. Many developers spend time searching for articles on the Internet only to find the same old tips about using the synchronized keyword and string concatenation without ever finding information that's useful. This article will h... (more)

Extreme Performance Tuning

There are many articles about basic performance tuning a Java application. They all discuss simple techniques such as using a StringBuffer versus using a String, and the overhead of using the synchronized keyword. This article doesn't cover any of this. Instead we focus on tips that can help make your Web-based application faster and highly scalable. Some tips are detailed, others brief, ... (more)