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			Challenge 1. How do you solve the timezone issue ... To remove the ^M characters at the end of all line... (This post requires Cleanup) Something I learned ... Here is a simple directory command that list all y... Control your hardware components! http://www.pbus-... SQL to Select a random row from a database table Here are the key differences between the upgrade a... Found this articke on handling exceptions. Worth r... Log4J Example In many of my projects I implemente... Here are some basic fundamentals and when to use t...


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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?

Labels: Java Challenge

- Sunday, February 15, 2009 -

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

:%s/^V^M//g

Labels: Unix

- Thursday, May 08, 2008 -

(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

Labels: IBM JVMs

- Wednesday, August 08, 2007 -

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

- Wednesday, December 06, 2006 -

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

- Sunday, August 13, 2006 -

SQL to Select a random row from a database table

- Monday, June 26, 2006 -

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.

- Tuesday, June 20, 2006 -

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