Spartan Java

In our first installment we reviewed the front-end part of developing a paginated list using AJAX and Java. Now we will dive into the back-end of our pagination mechanism.
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You have to display a list of items in a web application, for each item allowing several operations (ie modification, deletion, etc.). The list can potentially be quite long, so pagination is required.
This scenario is common in backoffice web applications and public web sites, be it for administering information or as search results display, etc.

I’ll describe a simple way to implement a lightweight pagination engine that minimizes load on the server and gives the user the better experience possible. In this first installment I’ll focus on the front-end side, describing how to lay out the HTML, load it using AJAX and implementing the basic operations the user needs to navigate in your paginated list.
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There are plenty of times when you need a cache for Java objects in your code. A very easy to use and simple implementation of a cache is provided with Apache ORO, wisely called CacheFIFO (http://jakarta.apache.org/oro/api/org/apache/oro/util/CacheFIFO.html).
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Just in case you didn’t know, raising an exception makes the JVM do a lot of dirty work breaking execution flow and stuff. More »

Do you really need to have a database table with all existing countries? What’s the benefit? Apart from adding one more database query to each page hit and an array to each users context while loading that form…

Think it over, every software component’s goal must be, first of all, to satisfy the users needs as fast and as reliably as possible. Considering the “fast” part, you must always evaluate if it’s really necessary to store this kind of info in a database table, and penalize the applications overall performance by adding another database query, recordset run through and a whole bunch of new objects in an array in request or session context.

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