jaxrpc

2010-08-25T07:56:00.001-07:00

How would I use JQuery to find a radio button by its value?

$(":radio[value=foobar]")

Feeling pain with Array and Jquery, refer this

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array

2010-03-19T07:53:00.001-07:00

Some JSTL Tips

1. How to iterate over a map in JSTL

2. How to set a hashmap value in JSTL

2009-02-15T07:46:00.000-08:00

Challenge

1. How do you solve the timezone issue across JVM's? Say your EJB server runs in different timezone, how does search for specific date time works?

2. Say you are calling a remote EJB which inturn initiates a JMS Message, how do you implement transaction in your application. In otherwords, if you rollback the database transaction, how do you rollback JMS transaction?

Did I confuse you enough?

2008-05-08T07:14:00.000-07:00

To remove the ^M characters at the end of all lines in vi, use:

:%s/^V^M//g

2007-08-08T09:00:00.000-07:00

(This post requires Cleanup)

Something I learned today about the JVM implementations on these IBM environments

AIX - is the Unix flavor from IBM
OS/400 is the operating system on AS/400 mostly referred as AS/400
iSeries is the new name for AS/400 servers
Z/OS is for mainframe

In 64 Bit JVM implementation on iSeries, GC cycle is different and referred as "Stop-the-world" (Synchronous GC) GC cycles. See http://www-03.ibm.com/servers/eserver/zseries/software/java/gcn2_faq.html for the acronym.

http://www.ibm.com/developerworks/java/library/j-jtp11253/ - Garbage Collection in the JVM

2006-12-06T11:23:00.000-08:00

Here is a simple directory command that list all your jar files. Output that to a file and using excel convert them as comma seperated entries for classpath setting.

dir /S /B *.jar > c:\jarfiles.txt

2006-08-13T07:35:00.000-07:00

Control your hardware components!
http://www.pbus-167.com/nhc/nhc.htm

2006-06-26T10:57:00.000-07:00

SQL to Select a random row from a database table

2006-06-20T06:57:00.000-07:00

Here are the key differences between the upgrade and regular exams. I will post my experience after taking the upgrade exam in a month.

Difference in exam objectives between SCJP Upgrade exam and Standard exam

(CX-310-056) vs. (CX-310-055)

Exam Objectives that are not required for Upgrade exam

Section 1: Declarations, Initialization and Scoping

Develop code that declares an interface. Develop code that implements or extends one or more interfaces. Develop code that declares an abstract class. Develop code that extends an abstract class.

Section 2: Flow Control

Develop code that makes use of assertions, and distinguish appropriate from inappropriate uses of assertions.
Recognize the effect of an exception arising at a specified point in a code fragment. Note that the exception may be a runtime exception, a checked exception, or an error.

Section 3: API Contents

None

Section 4: Concurrency

Given a scenario, write code that makes appropriate use of object locking to protect static or instance variables from concurrent access problems.
Given a scenario, write code that makes appropriate use of wait, notify, or notifyAll.

Section 5: OO Concepts

Develop code that implements "is-a" and/or "has-a" relationships.

Section 6: Collections / Generics

Distinguish between correct and incorrect overrides of corresponding hashCode and equals methods, and explain the difference between == and the equals method.

Section 7: Fundamentals

Given an example of a class and a command-line, determine the expected runtime behavior.
Determine the effect upon object references and primitive values when they are passed into methods that perform assignments or other modifying operations on the parameters.
Given a code example, recognize the point at which an object becomes eligible for garbage collection, and determine what is and is not guaranteed by the garbage collection system. Recognize the behaviors of System.gc and finalization.
Write code that correctly applies the appropriate operators including assignment operators (limited to: =, +=, -=), arithmetic operators (limited to: +, -, *, /, %, ++, --), relational operators (limited to: <, <=, >, >=, ==, !=), the instanceof operator, logical operators (limited to: &, |, ^, !, &&, ||), and the conditional operator ( ? : ), to produce a desired result. Write code that determines the equality of two objects or two primitives.

2006-04-12T08:29:00.000-07:00

Found this articke on handling exceptions. Worth reading the entire document.
Exceptions in Java

2006-03-19T14:11:00.000-08:00

Log4J Example

In many of my projects I implemented log4j as rootLogger instead of categorizing
them based on packages or by business modules
After reading through log4j manual many times, still Ididn't understand how to implement the logger categories and levels. Here is a working sample and troubleshooting in case you run into issues as I did.

## Sample log4j configuration specified in log4.properties
log4j.rootLogger=FATAL, stdout
log4j.logger.com.mycomp.local=WARN, stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

#Sample code using this logger category
package com.mycomp.local;

import org.apache.log4j.Logger;
public class Sample1
{
private static Logger myLog = Logger.getLogger(Sample1.class);
public Sample1(){}
public static void main(String[] args) {
Enumeration enumList = LogManager.getCurrentLoggers();
while(enumList.hasMoreElements()){
Logger myLog = (Logger)enumList.nextElement();
myLog.getName();
System.out.println("Current Logger -" +myLog.getName() + "="+
myLog.getLevel());
}
myLog.debug("Inside debug1");
myLog.warn("Inside Warn1");
}

The important thing to note about the configuration is to specify appender.
Without the stdout appender in

log4j.logger.com.mycomp.local=WARN, stdout

The program would print DEBUG information even though root category is set to FATAL Give it a try!

2006-02-15T04:08:00.000-08:00

Here are some basic fundamentals and when to use them/

Abstract classes vs. interfaces

Abstract classes and interfaces practicum

Best Practices to improve Performance in J2SE

J2EE Spefication versions

2006-02-13T04:50:00.000-08:00

Here are some of the specification versions and the app server supported versions

J2EE Version 1.4 – Servlet specification 2.4, JSP specification – 2.0

J2EE Version 1.3 – Servlet specification – 2.3

BEA Support

Weblogic 8.1 SP2

J2EE specification -1.3
Servlet specification – 2.3
JSP specification – 1.2

WebSphere 5.1.2
J2EE specification -1.3
Servlet Specification Level: 2.3
JSP Specification Level: 1.2
EJB 2.0
JDBC 2.0
JTA 1.0
JavaMail 1.2
JAXP 1.1
JMS 1.0.2
http://java.sun.com/j2ee/sdk_1.3/techdocs/release/ReleaseNotes.html

2006-02-05T05:19:00.000-08:00

Sometime the basics such as heap, stack causes many confusion. Here is a article that puts together.
The lean, mean, virtual machine

Practical UML

2005-12-12T14:15:00.000-08:00

Today I came across a article on Practical UML™: A Hands-On Introduction for Developers - by Randy Miller
Check it out at http://bdn.borland.com/article/0,1410,31863,00.html
Finally I see the real use of UML/Class diagram/Sequence diagrams. Also I am currently using Sun Java Enterprise studio for complete design in my new application. More about it later.....

Some open source API's

2005-11-17T06:12:00.000-08:00

Over these years I came across many API’s and used it in my project. Finally I decided to put it out and see what other folks are using. Here is my comprehensive list

iBATIS (http://ibatis.apache.org/ )- O/R mapping API where the approach is bottom to top (mapping for existing database)
I found this better than Hibernate(3.x prior) where it doesn't support stored procedures.Check it out.
JIBX http://jibx.sourceforge.net/ framework for binding XML data to Java objects.I came across this API from Java user group meeting

Oracle JDBC Connection pool in Sun Java System Application Server

2005-10-12T09:08:00.000-07:00

Configuring Oracle JDBC Connection pool in Sun Java System Application Server

This article might help some one finding difficult to create a JDBC connection pool in Sun Java System Application server

Follow these steps to create JDBC connection pool from admin console

Copy the drivers to domain lib folder

Modify JVM settings and add jar location to classpath suffix. The entry should look similar to this ${com.sun.aas.installRoot}/domains/domain1/lib/ojdbc14.jar

In JVM options tab specify -Doracle.jdbc.J2EE13Compliant=true

Specify name for connection pool

In resource type select javax.sql.Datasource

Select oracle as vendor

Use the default Datasource classname entry oracle.jdbc.pool.OracleDataSource

Specify only these 3 properties

User: user name
Password: password
URL: jdbc:oracle:thin:@<hostname>:<port>:<database name>

Test your connection by using Ping button

References:

1. http://docs.sun.com/app/docs/doc/819-2641/6n4trr8kt?a=view
(Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 >> Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 Administration Guide >> 3. JDBC Resources >> Setting Up Database Access >> To integrate a JDBC driver)
2. Using the JDBC API for Database Access

Sun Java System App server vs Tomcat

2005-10-10T08:05:00.000-07:00

Sun Java™ System Application Server Platform Edition 8.1 2005Q1

I am still trying to figure out what differences are in deploying applications to a production environment running on Sun server vs Apache Tomcat. Please leave me a comment just in case if you know any such comparisons.

2005-10-10T06:52:00.000-07:00

Using JavaServer Faces Technology with AJAX

Stored Procedure in Hibernate

2005-10-10T04:20:00.000-07:00

Stored Procedure in Hibernate

I am fairly new to hibernate still trying to figure out how to use it in my project. A little setback in using hibernate in my project due to the fact it does not fully support stored procedures. May be I should use traditional JDBC route.

2005-09-19T08:02:00.000-07:00

Very interesting application to record DRM protected music!

2005-08-31T07:33:00.000-07:00

Why StAX?: " a programming model in which an XML parser sends (pushes) XML data to the client as the parser encounters elements in an XML infoset--that is, the parser sends the data whether or not the client is ready to"

2005-08-16T18:09:00.000-07:00

Interesting site about Hybrid conversions! They claim modifications yield them upto 250mpg! Simply amazing.

California Cars Initiative for Plug-In Hybrid Vehicles

2005-08-16T14:49:00.000-07:00

Experimental Hybrid Cars Get Up to 250 Mpg - Yahoo! News: "Experimental Hybrid Cars Get Up to 250 Mpg "

2005-08-14T09:09:00.000-07:00

Great Article on Continuous Integration
Continuous Integration

2005-08-13T06:22:00.000-07:00

Maven provides standard developement structure across many projects. Dependency management is a part of Maven.
If you see a project that requires more customization of Maven, then Ant is a good choice instead of Maven.

2005-08-12T12:50:00.000-07:00

Excellent tool to merge files WinMerge

2005-08-03T07:38:00.000-07:00

Resources for Java Performance Tuning

2005-08-01T12:44:00.000-07:00

Access vs MySQL

2005-07-22T10:51:00.000-07:00

The JSTL Expression Language

2005-07-18T20:30:00.000-07:00

Parsing The Querystring with Javascript

2005-07-10T07:13:00.000-07:00

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