http://blog.aparnachaudhary.net My Blog about Java, and Open Source Thu, 19 Aug 2010 07:55:40 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 http://blog.aparnachaudhary.net/2010/07/10/scala-step-by-step/ http://blog.aparnachaudhary.net/2010/07/10/scala-step-by-step/#comments Sat, 10 Jul 2010 17:38:44 +0000 Aparna Chaudhary http://blog.aparnachaudhary.net/?p=524 dzone_url = "http://blog.aparnachaudhary.net/2010/07/10/scala-step-by-step/";var dzone_style="2";I decided to learn Scala when I saw a piece of code written by one of my colleagues. I was amazed with its conciseness. But I failed at my first attempt to learn this language. I know the reason why. I read some stuff without writing enough code. After couple of days, all the [...]]]> http://blog.aparnachaudhary.net/2010/07/10/scala-step-by-step/feed/ 0 http://blog.aparnachaudhary.net/2010/05/23/introduction-to-hibernate-search-framework/ http://blog.aparnachaudhary.net/2010/05/23/introduction-to-hibernate-search-framework/#comments Sun, 23 May 2010 12:57:03 +0000 Aparna Chaudhary http://blog.aparnachaudhary.net/?p=490 dzone_url = "http://blog.aparnachaudhary.net/2010/05/23/introduction-to-hibernate-search-framework/";var dzone_style="2";Enterprise Search is becoming one of the common requirements of any consumer web application that we build these days. So I thought of learning some stuff in this domain. If you think about open source frameworks providing enterprise search functionality, probably Lucene is the one and only answer that comes to your mind. Lucene [...]]]> http://blog.aparnachaudhary.net/2010/05/23/introduction-to-hibernate-search-framework/feed/ 0 http://blog.aparnachaudhary.net/2010/04/23/using-spring-integration-with-twitter4j-to-email-tweets/ http://blog.aparnachaudhary.net/2010/04/23/using-spring-integration-with-twitter4j-to-email-tweets/#comments Fri, 23 Apr 2010 06:54:19 +0000 Aparna Chaudhary http://blog.aparnachaudhary.net/?p=461 dzone_url = "http://blog.aparnachaudhary.net/2010/04/23/using-spring-integration-with-twitter4j-to-email-tweets/";var dzone_style="2";Recently I was playing around with Spring Integration. To understand any new framework one cannot just rely on documentation. So I created a demo application to try out different features of the framework. Since my main motivation was to understand Spring Integration framework, I wanted to spend minimal efforts in input data generation. So [...]]]> http://blog.aparnachaudhary.net/2010/04/23/using-spring-integration-with-twitter4j-to-email-tweets/feed/ 3 http://blog.aparnachaudhary.net/2009/11/20/esper-complex-event-processing-engine/ http://blog.aparnachaudhary.net/2009/11/20/esper-complex-event-processing-engine/#comments Fri, 20 Nov 2009 13:28:39 +0000 Aparna Chaudhary http://blog.aparnachaudhary.net/?p=375 dzone_url = "http://blog.aparnachaudhary.net/2009/11/20/esper-complex-event-processing-engine/";var dzone_style="2";Recently I presented a talk about Esper at JTeam Tech Meeting. Please go through the slides if you are interested in understanding more about Complex Event Processing and Esper . The first half of the presentation covers conceptual knowledge of Complex Event Processing, its advantages over traditional approaches and use cases. The second part [...]]]> http://blog.aparnachaudhary.net/2009/11/20/esper-complex-event-processing-engine/feed/ 0 http://blog.aparnachaudhary.net/2009/11/06/generating-dynamic-pdf-using-itext/ http://blog.aparnachaudhary.net/2009/11/06/generating-dynamic-pdf-using-itext/#comments Fri, 06 Nov 2009 14:49:20 +0000 Aparna Chaudhary http://blog.aparnachaudhary.net/?p=362 dzone_url = "http://blog.aparnachaudhary.net/2009/11/06/generating-dynamic-pdf-using-itext/";var dzone_style="2";iText is a library that allows you to generate PDF files on the fly. In the following blog post I would show how to 1. Create PDF using PDF Template and PDF Form 2. Appending documents Create PDF using PDF Template for PDF AcroForm: template.pdf is a PDF template with PDF Form fields firstName and lastName. // Read the template InputStream [...]]]> http://blog.aparnachaudhary.net/2009/11/06/generating-dynamic-pdf-using-itext/feed/ 5 http://blog.aparnachaudhary.net/2009/07/29/date-dropdownchoice-apache-wicket/ http://blog.aparnachaudhary.net/2009/07/29/date-dropdownchoice-apache-wicket/#comments Wed, 29 Jul 2009 14:18:47 +0000 Aparna Chaudhary http://aparnachaudhary.wordpress.com/?p=272 dzone_url = "http://blog.aparnachaudhary.net/2009/07/29/date-dropdownchoice-apache-wicket/";var dzone_style="2";Apache Wicket is yet another Java Web Development framework. But the beauty of Wicket is it provides clear separation of concerns. It doesn’t mix markup and java and saves you from adapting to additional expression language. Wicket templates are simple HTML files with only additional wicket attribute wicket:id. This makes it easy for the [...]]]> http://blog.aparnachaudhary.net/2009/07/29/date-dropdownchoice-apache-wicket/feed/ 2 http://blog.aparnachaudhary.net/2009/07/22/stop-the-blame-game-with-perf4j/ http://blog.aparnachaudhary.net/2009/07/22/stop-the-blame-game-with-perf4j/#comments Wed, 22 Jul 2009 08:45:55 +0000 Aparna Chaudhary http://aparnachaudhary.wordpress.com/?p=253 dzone_url = "http://blog.aparnachaudhary.net/2009/07/22/stop-the-blame-game-with-perf4j/";var dzone_style="2";Performance tracking and monitoring is often a problem with many applications. Especially in systems with distributed SOA architecture, its difficult to identify the services causing performance hit. So its nice, wise and safe always to profile heavy operations in exterprise applications. Theres always a bad day when suddenly system starts showing its true colors [...]]]> http://blog.aparnachaudhary.net/2009/07/22/stop-the-blame-game-with-perf4j/feed/ 0 http://blog.aparnachaudhary.net/2009/04/09/xstream/ http://blog.aparnachaudhary.net/2009/04/09/xstream/#comments Thu, 09 Apr 2009 19:41:00 +0000 Aparna Chaudhary http://aparnachaudhary.wordpress.com/?p=212 dzone_url = "http://blog.aparnachaudhary.net/2009/04/09/xstream/";var dzone_style="2"; Writing clean, isolated and efficient unit test is often a challenge for developers. Efficient test should cover all the possible business scenarios. To create test for covering multiple test scenarios, you need more test data. For instance, imagine you are writing a test for some Service component. Now if the responsibility of this service is [...]]]> http://blog.aparnachaudhary.net/2009/04/09/xstream/feed/ 0 http://blog.aparnachaudhary.net/2009/04/07/thinking-performance/ http://blog.aparnachaudhary.net/2009/04/07/thinking-performance/#comments Tue, 07 Apr 2009 21:23:28 +0000 Aparna Chaudhary http://aparnachaudhary.wordpress.com/?p=191 dzone_url = "http://blog.aparnachaudhary.net/2009/04/07/thinking-performance/";var dzone_style="2";Have you ever spent days rewriting the whole application burning the midnight oil? Well, I don’t think you are the only one. In early days of my career I also made similar mistakes or was a victim of mistakes made by fellow developers. Having taken this roller coaster ride, spending sleepless nights fixing the [...]]]> http://blog.aparnachaudhary.net/2009/04/07/thinking-performance/feed/ 0 http://blog.aparnachaudhary.net/2009/03/02/query-the-future-with-cep/ http://blog.aparnachaudhary.net/2009/03/02/query-the-future-with-cep/#comments Mon, 02 Mar 2009 21:20:15 +0000 Aparna Chaudhary http://aparnachaudhary.wordpress.com/?p=165 dzone_url = "http://blog.aparnachaudhary.net/2009/03/02/query-the-future-with-cep/";var dzone_style="2";Complex Event Processing (CEP) is a buzzword that’s been running around the industry for last couple of years. The concept was introduced by David Luckham of Stanford University who has done over a decade of research in this field. Let’s try to understand some terms that are used frequently in this arena. An Event is [...]]]> http://blog.aparnachaudhary.net/2009/03/02/query-the-future-with-cep/feed/ 0