Thursday, November 29, 2007

Oracle Fast Connection Failover for a RAC cluster

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Problem:Whenever one node of a Oracle RAC cluster goes down, some of the connections allocated to that node go stale in the connection pool....

3 easy steps to self-sign a Applet Jar file

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Found this link that explains how to self-sign an applet in 3 easy steps: 1. keytool -genkey -keystore myKeyStore -alias me 2. keytool -self...
Tuesday, November 27, 2007

FCKeditor

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Came across this beautiful AJAX control that can be used to emulate a HTML editor text box. http://www.fckeditor.net/ - worth a look.
Monday, November 26, 2007

Setting focus on the first field

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Whenever a HTML page is loaded, we often want to set the focus on the first input field of that page. Came across this Javascript code that ...
Tuesday, November 13, 2007

Reflection in Java-XML binding frameworks

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Almost all Java-XML binding frameworks use Java reflection to map Java objects to XML documents. I had used Castor and XMLBeans in our proje...
Wednesday, November 07, 2007

SQL to find out indexes on a table

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Quick reference to find out indexes on a table from the command prompt. select * from user_indexes where table_name = 'MY_TABLE' sel...
Tuesday, November 06, 2007

Disk usage commands on Solaris

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du and df are the most powerful commands on Solaris to find out the disk usage. Here is a list of the most useful commands at a glance. - df...
Monday, November 05, 2007

Modal Dialog session expiry issue in IE 6

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In our application we were facing a very queer problem. One of our page flows was opening a modal dialog from another modal dialog. While do...
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...