Thursday, October 25, 2007

Integrating JAMon war with your application on Websphere

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We were using the JAMon package for performance monitoring. We needed to integrate the JAMon WAR file contents into our application so that ...
Wednesday, October 24, 2007

Access predicates and Filter predicates in Explain plan

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In Oracle 10g, when we see the explain plan for a SQL, then there are 2 new items that are of interest - the 'Access predicate' and ...
Tuesday, October 09, 2007

Webpshere v6.1 deployment hack

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Whenever I wanted to change a single file on WAS server, I often used to copy that file to the 'installedApps' EAR directory of the ...

JAMon JDBCMonProxy -getting the orginal connection

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While using JAMon to monitor SQL perf stats, we faced a small problem - at one place we needed the underlying OracleConnection object and no...
Friday, September 28, 2007

rm craziness

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I was trying to delete some files on Solaris using the rm command. The file names were something like: "-HqFbc3YQ0wQYhH7u16veP7_BBC_6_0...
Wednesday, September 12, 2007

What does a Digital certificate contain?

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If you view a digital certificate using FireFox browser or decoding it using some tool such as OpenSSL/IKeyMan; then we can see the followin...

Formats for Digital certificates

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I knew that all Digital certs confirm to the X.509 standard. But why were they so many extensions for certificate files? - e.g. DER, CER, .P...

Adding trusted root certificates in Websphere 6.1

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We had deployed an application to WAS 6.1 ND. This application contained a JAX-WS 2.0 webservices client that used to call a third-party ser...

Hack to deploy JAX-WS 2.0 webservice on Websphere 6.1

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Our team had developed a webservice using JAX-WS 2.0 and using the Reference implementation of Sun as the JAX-WS provider. The application w...

Is POX/HTTP same as REST?

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There is a lot of confusion in the industry over REST webservices. A lot of applications offer POX/HTTP interfaces and call them REST webser...
Tuesday, September 04, 2007

Message style and encoding in WSDL documents

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The WS-I specs state the following 2 types of encoding to be complaint to the Basic profile: - RPC/literal - Wrapped document/literal Found ...

WSDL cheat sheet

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With the plethora of tools available today for webservices development, we sometimes forget the basic fundamental semantics of a WSDL docume...
Monday, September 03, 2007

Xerces and Xalan packages in JDK 1.5

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Since JDK 1.5, Sun has decided to change the package names of the Xalan and Xerces to "com.sun.org.apache.xalan" and "com.sun...
Friday, August 31, 2007

HTML menu DIV tag over a SELECT element

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We are using a JS menu that used layers created by div tags. The problem was that this layer was hiding behind behind 'select' dropd...
Wednesday, August 29, 2007

Heap size and Perm size

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I was getting confused if the heap size specified by -Xmx included the Perm size or it did not? The GC document on Sun's site showed the...
Saturday, August 18, 2007

HttpClient in a multi-threaded environment

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Our application was using HttpClient library to connect to various third-party systems. I was proposing to develop a smart resuable componen...
Wednesday, August 15, 2007

Finding the version of Solaris

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Commands to find out the version of Solaris the box is running on: uname -X more /etc/release
Wednesday, August 08, 2007

Viewing large files on Linux/Solaris

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Log files of J2EE applications can become very big. In our application, the log files were of the size ~ 700 MB to 1GB. To search such big f...

Javascript goodies

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Today, I spend quite some time refactoring messy Javascript code: 1.) I needed to extract a number appended to the end of the string - use t...
Tuesday, July 24, 2007

Java Applet Caching Issues

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I spent the last 3 days in frustration trying to get Java Plug-in cache mechanisms to work. Since JDK 1.5, the Java Plug-in has advanced cac...

Search functionality in Textpad and EditPlus

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A lot of people use text editors such as Textpad and EditPlus. My favourite is Textpad; it can handle large files and also has a very good i...
Sunday, July 22, 2007

Favicon is a bit messy

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Recently when I was analysing the log files on the server, I came across many reqeuests for a resource - favicon.ico This was strange, since...
Friday, July 20, 2007

Cool collection of JS code

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Found this link that contains a cool collection of Javascript code. Worth a perusal. I liked the fee menu javascript code available here: ht...
Wednesday, July 18, 2007

Interpreting 2 digit years

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As a good practice, it is always recommended to use 4 digits to specify the year. But a lot of applications may have a front-end that accept...

JS library for dates

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I was looking for a reusable JS function that would allow me to format and compare dates just the way it is done in Java using classes such ...
Saturday, July 14, 2007

Difference between empty string and null in Oracle Database

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In Oracle, when we store a empty string i.e. "" through JDBC, then Oracle stores it as a NULL value. This causes a lot of confusio...
Friday, July 13, 2007

Dynamically making a field as readOnly using Javascript

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I was looking for a sleek solution that would make all the fields of my form read-only dynamically - or atleast make them appear to be reado...

ReadOnly and Disabled fields

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In HTML, we have two options if we want non-editable fields. Mark the fields as readonly or make them disabled. The difference between the t...
Thursday, June 21, 2007

Snoop on Solaris and Ethereal

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I am a big fan of Ethereal tool and use it frequently for analysis of network traffic. The GUI is great and we can decode HTTP traffic from ...

Time complexity and Space complexity of algorithms

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I had just downloaded the SAP Memory Analyser and was impressed with its performance. More information on this tool can be found here . Goin...