Thursday, December 29, 2005

About Daemon Threads in Java

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Came across this cool article about Daemon Threads at http://www.absolutejava.com/main-articles/beware-the-daemons/ I knew that the VM does ...
Monday, December 26, 2005

Debug information in Java .class files

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I have often wanted to learn more about the class file format of Java class files. This study let me to interesting discoveries - regarding ...
Friday, December 23, 2005

Select second highest record with a query

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A friend of mine was asked in an interview to write a query to fetch the second highest marks in a table of students. Well, I found out 2 wa...

Hierarchical databases Vs Relational Databases

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While designing a systems, I often came across the moot point of choosing btw a heirarchical database and a relational flat table database. ...
Thursday, December 22, 2005

The beauty of Log4J

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It took me sometime to appreciate the inheritance heirarchy in Log4J. It's quite simple to understand the Log Levels and their usage. It...

Ruminating on ClassLoaders in JVM.

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One interesting point about ClassLoaders is that it is possible for the same class to be loaded separately by different class-loaders, resul...
Wednesday, December 21, 2005

O/R mapping tools

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I have had some experience with some O/R mapping tools such as TopLink and Hibernate. But I did not know that the market is flooded with a ...
Tuesday, December 20, 2005

Is Swing really slow?

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Often I have heard people complain that Swing Apps are slow. I also have had some bad experiences with slow Swing Apps, but then I have also...
Wednesday, December 14, 2005

Duplicate Form Submission and the Synchronizer Token pattern

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The Synchronizer Token pattern addresses the problem of duplicate form submissions. A synchronizer token is set in a user's session and ...

Proxy setting for .NET programs

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To access an internet site thru a .NET program U may have to go thru Ur company proxy. Here's the sample code for doing so: string query...

Locking in Databases

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Databases support different types of locking strategies. We have optimistic locking strategies where concurrency would be more, but data int...
Tuesday, December 13, 2005

Deleting duplicate rows from a table

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This seems to a favourite question during interviews - How to delete duplicate rows in a table? Well, we can have many strategies: - Capture...
Thursday, December 08, 2005

Tools used in SDLC

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I decided to list down all the available tools for different phases of a SDLC. Here it goes: Requirements Management: - DOORS : Dynamic Obje...

Cool Free Data Models

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While browsing the web, I came across this cool site which has over 200 data-models samples. Great for anyone who wants to learn about data-...

Data Modelling Vs OO Modelling

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While working on projects, often I had tussles with erst-while database developers who used to drive the design of the system using Data Mod...

What are Multi-dimensional databases?

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A multidimensional database (MDB) is a type of database that is optimized for data warehouse and online analytical processing (OLAP) applica...
Tuesday, December 06, 2005

Ruminating on Database Cursors

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Cursors are database objects that allow us to manipulate data in a set in a row-by-row basis or on a group of rows at one time. Cursors are ...
Monday, December 05, 2005

Quick HEX dump utility in DOS

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Recently, I wanted to see the hex dump of a binary file on a server. The server machine did not have my favourite hex GUI editors. I strugg...

Cool APIs for packet sniffing

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A few years back, I often used to lament on the lack of packet sniffing API's available in Java or C#.NET. I knew of the WinPcap library...
Friday, December 02, 2005

DataReader Vs DataSet in ADO.NET

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Came across a wonderful article on MSDN which contrasts the use of DataReader Vs DataSet. The article is available at : http://msdn.microsof...

User Defined Functions Vs Stored Procedures

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Most databases have built-in functions, such as GetDate, DateAdd, and ObjectName. Such built-in functions are useful, but you can’t alter th...
Friday, November 25, 2005

Microsoft Enterprise Application blocks

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Recently, Microsoft's Pattern & Practices Group has released the Enterprise Library, a large configurable and extensible software li...

Ruminating on Transactions

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Most of us have worked on transactions one time or the other. Transactions can be broadly classified as local or distributed . Local transa...

Making web service proxy URL dynamic in .NET

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In VS.NET, whenever we add a web-reference to a webservice, what happens behind the scenes is that a proxy is created which contains the URL...
Thursday, November 24, 2005

Object pooling in Java

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Quite often, we may have to use object pooling to conserve resources and increase performance. I came across some pretty good abstract compo...

Doug Lea's Home Page

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I have been impressed with the genius of Doug Lea when I saw his concurrent package in Java. His home page contains a lot of interesting lin...

Thread pools in Java

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I have often used thread pools in my applications. My favourite opensource thread pool was the PooledExecutor class written by Doug Lea (ava...
Thursday, November 17, 2005

StringBuilder in Java 5.0

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There is a new class in Java5.0 - StringBuilder class that can be used whenever we are doing some heavy-duty string manipulation and we do n...
Wednesday, November 09, 2005

Understanding Unicode

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I still see many people with a lot of myths about Unicode. I guess the reason for this is that a lot of people still feel that Unicode is a ...

On Bytes and Chars...

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During i8n and localization, we often come across basic fundamental issues such as: - How many bytes make a character? - How many characters...