This article explains how to enable log4j logging and how to change configuration to generate different levels of logs in a web application. It also tells how to enable logging for different frameworks like Struts, Spring, Hibernate etc.

Recently, I got a chance to do hands on Infrared J2EE performance testing tool. While going through documentation available on internet, I noticed that everything is in windows operating system context. Hence I had to change all configuration to suite unix environment. It was weblogic 8.1 on unix. It did eat up some time. Hence thought of sharing those installation details.

WSDL, webservice description language, is the contract definition of any webservice. This XML document is used to tell the world what is going to be the definition/structure of the webservice, what that webservice has to offer. Here is an example webservice document explained using inline comments. We are not taking any complex example here. But it is very close to real life wsdl. There are many tools available that can be used to write wsdl.

<?xml version=”1.0″ encoding=”UTF-8″?>
<wsdl:definitions targetNamespace=”http://www.deepakgaikwad.net/ws/ExampleServices”
xmlns=”http://www.deepakgaikwad.net/ws/ExampleServices”
xmlns:soap=”http://schemas.xmlsoap.org/wsdl/soap/”
xmlns:wsdl=”http://schemas.xmlsoap.org/wsdl/”
xmlns:xs=”http://www.w3.org/2001/XMLSchema”>

<!– Document the wsdl –>
…

JSR 168 defined the contract between applications to be developed using portlet technology and the portal servers. But this technology somehow lagged behind in evolution and continued to exist with many challenges. During application technology stack selection, one comes across portal server options many times. Sometimes we have to choose between application server and portal server itself. In this case you have few requirements which are pointing towards use of portal server, but it may be the case that you are not sure whether really there is a need of …

If we look at the way Java open source technologies are advancing around plain old Java objects, we can definitely say that this is an era of POJOs. Now, you may be feeling that writing functionality in simple objects is enough to build a complex application, where rest of the supporting services can be provided externally. Spring has be the front runner in building technology around POJOs. But Sun’s recent releases of SDK and JEE are focusing on the same principle. EJB is not left out from Sun’s this focus, …