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RECHARGEABLE PORTABLE SPEAKER BUILT IN SUITABLE

RECHARGEABLE PORTABLE SPEAKER BUILT IN SUITABLE

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Cadalyst Magazine’s All In One CAD Tip 5 and I Helped

Cadalyst Magazine has had a series of All-in-One CAD tips put together by one of my favorite CAD Guru’s Curt Moreno, the Kung Fu Drafter.

The series is sponsored by HP’s new “All-In-One” Workstation the Z1.

On Tip Five, Mr. KFD asked me to lend a hand. I contributed the tip about using Autodesk Design Review. I’m so proud! Check it out and check out the other All-In-One tips from Cadalyst, KDF, and HP.

2 Million iPads in 2 Months

2 Million iPads in 2 Months

While most people were gathered around their barbecues and remembering fallen soldiers, Apple was proclaiming the iPad the greatest computer in the world, ever! OK, not really, but they did announce that since its launch about two months ago, theyve sold over two million iPads. The iPad, which shipped on April 3 of this year, hit stores in Europe, Canada, Australia, and Japan just last Friday. Crowds lined the streets in those countries, while the Apple online store has been swamped with purchases - a seven to ten day wait is being placed on new orders.

Steve Jobs talked about the shortage in a statement, "We appreciate patience, and are working hard to build enough iPads for everyone." When announced in January, Wall Street analysts projected the iPad would only sell anywhere from 175,000 to 778,000 units a month. You can bet Steven Jobs is thrilled to prove them wrong.

While the iPad hit stores in April, technically, they could be pre-ordered as early as March 12 in the United States. That was eleven weeks ago. Apples numbers break down to show that in those eleven weeks, 181,818 iPads were sold per week. If they keep that up for the rest of 2010, the company will sell over 7.6 million of the tablet computers.

But could that number grow even larger? You betcha! Now that sales have expanded to other countries, with nine more countries being added in July and even more later in the year, sales should be a lot higher. Apple is no stranger to these kinds of sales numbers. Last summer, the iPhone 3GS sold over a million units in the first three days they were on the market.

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Understanding DATALOSS Advisory in Tibco Rendezvous or Tibco RV

Understanding DATALOSS Advisory in Tibco Rendezvous

tibco rendezvous tutorial, tibco tutorials

While working with TIBCO rendezvous you guys must have been faced problem of DATALOSS and might be aware of its severe consequences and in worst case how it can cause TIBCO Storm (A situation where TIBCO publisher bombards network with publishing so many messages and exhaust all network bandwidth of WAN links resulting in complete breakdown of network lines and communication).

This Tibco Tutorial is in continuation of my Tibco Tutorial series and in this short TIBCO tutorial I will explain what is DATALOSS in Tibco and How we can minimize or prevent DATALOSS in Tibco RV.

Decorator design Pattern in Java with Example Java Tutorial

I was thinking to write on decorator design pattern in Java when I first wrote 10 interview questions on Singleton Pattern in Java. Since design pattern is quite important while building software and it’s equally important on any Core Java Interview, It’s always good to have clear understanding of various design patterns in Java. In this article we will explore and learn Decorator Design pattern in Java which is a prominent core Java design pattern and you can see lot of its example in JDK itself. JDK use decorator pattern in IO package where it has decorated Reader and Writer Classes for various scenario, for example BufferedReader and BufferedWriter are example of decorator design pattern in Java. From design perspective its also good idea to learn how existing things work inside JDK itself for example How HashMap works in Java or How SubString method work in Java, that will give you some idea of things you need to keep in mind while designing your Class or interface in Java. Now let’s Move on to Decorator pattern in Java.

JSTL forTokens Tag Example Split String in JSP

JSTL forTokens tag is another tag in core JSTL library to support Iteration or looping. It effectively complements, more useful <c:forEach> tag, by allowing you to iterate over comma separated or any delimited String. You can use this tag to split string in JSP and can operate on them individually. forTokens tag has similar attribute like forEach JSTL tag except one more attribute called delims, which specifies delimiter. For example to iterate over colon separated String "abc:cde:fgh:ijk", delims=":". By the way, forTokens tag also accept multiple delimiter, which means, you can split a big string into token based upon multiple delimiter e.g. colon(:) and pipe (|), This will be more clear, when we will see examples of JSTL forTokens tag in JSP. Rest of attribute e.g. items, var, varStatus, begin, end and step are same, as they are in case of <c:forEach> tag. For quick review, items specify String which needs to be split-ed in token and var hold current String.

Difference between List and Set in Java Collection

What is difference between List and Set in Java is a very popular Java collection interview questions and an important fundamental concept to remember while using Collections class in Java. Both List and Set are two of most important Collection classes Java Program use along with various Map implementation. Basic feature of List and Set are abstracted in List and Set interface in Java and then various implementation of List and Set adds specific feature on top of that e.g. ArrayList in Java is a List implementation backed by Array while LinkedList is another List implementation which works like linked list data-structure. In this Java tutorial we will see some fundamental difference between List and Set collections. Since List and Set are generified with introduction of Generics in Java5 these difference also application to List and Set.

This article is in continuation of my earlier post on Collection e.g. Difference between HashMap vs HashSet, Difference between HashMap and Hashtable and Difference between Concurrent Collection and Synchronized Collection. If you haven't read them already you may find them useful.

Difference between FIX 4 2 vs FIX 4 4 in FIX connectivity

FIX 4.2 vs FIX 4.4

FIX protocol has evolved over time; it’s now more than a decade it’s started by Fidelity and Solomon Brothers. FIX connectivity is the most popular connectivity solution exists for trading whether its equities, futures, options or fixed income or even foreign exchange (FX). FIX protocol has dominated the market and become as standard solution for any market or broker which is trying to develop connectivity with market within a short period of time because of complexity of native exchange api and lack of support FIX protocol come as handy.

Batch processing in Java with Spring batch part 1

Make sure that you do this beginner tutorial first

Beginner Spring batch tutorial with simple reader and writer

Q. What do you understand by batch processing and why do you need them?
A. The idea behind batch processing is to allow a program to run without the need for human intervention, usually scheduled to run periodically at a certain time or every x minutes.The batch process solves

execution that takes a lengthy amount of time (e.g. consolidated reports, re-balancing the financial portfolio, etc)
processing a large input set of data via ETL (Extract Transform and Load) operation.
automating some business process that doesn’t necessarily need to be triggered by a human.

In general, a batch process involve

Reading data from data sources like databases, files, etc
Processing the data through a number of steps. This can involve transforming the data, performing calculation, generating length reports, etc.
Finally, writing the processed data to databases or file systems.

Q. What libraries do you need to get started with spring batch
A. The pom.xml file will be the start. Fill in the appropriate versions and the additional dependencies required.

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.myapp</groupId>
  <artifactId>mybatchapp</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>mybatchapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
        <groupId>org.springframework.batch</groupId>
        <artifactId>spring-batch-core</artifactId>
        <version>....</version>
    </dependency>
    <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>....</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring</artifactId>
        <version>...</version>
    </dependency>
 
 ...other dependencies like hibernate
 
  </dependencies>
  ...
</project>

Q. What are the key terms of Spring batch?
A.

JobLauncher: It helps you to launch a job. It uses a JobRepository to obtain a valid JobExecution.
JobRepository: A persistent store for all the job meta-data information. Stores JobInstances, JobExecutions, and StepExecutions information to a database or a file system. The repository is required because a job could be a rerun of a previously failed job.
Job: Represents a job. For example, an portfolio processing job that calculates the portfolio value. JobInstance: A running instance of a job. If a job runs every week night, then there will 5 instances of that job in a week.
JobParameters: Parameters that are used by the JobInstance. For example, the portfolio processing job requires the list of account numbers as the input parameters. The job parameters are passed as command line arguments.
JobExecution: Every attempt to run a JobInstance results in a JobExecution. If a job fails then it will be rerun and we end up having a single JobInstance with 2 JobExecutions (1 failed execution and 1 successful execution).
Step: Each job is made up of one or more steps.
StepExecution: Similar to JobExecution, there are StepExecutions. This represents an attempt to run a Step in a Job.

Q. Can you describe the key steps involved in a typical batch job scenario you had worked on?
A. A simplified batch process scenario is explained below.

The scenario is basically a batch job that runs overnight to go through all the accounts from the accounts table and calculates the available_cash by subtracting debit from the credit.

Step 1: Define a batch control table that keeps metdata about the batch job. The example below shows a batch_control table that process accounts in chunks. The account numbers 000 - 999 ara processed by a job and account_no 1000 - 1999 by another job. This table also holds information about when the job started, when the job finished, status (i.e. COMPLETED or FAILED), last processed account_no, etc.

job_id	job_name	start_timestamp	end_timestamp	status	account_ no_from	account_ no_to	last_ account_no
1	accountValueUpdateJob1	21/04/2012 3:49:11.053 AM	21/04/2012 3:57:55.480 AM	COMPLETED	000	999	845
2	accountValueUpdateJob2	21/04/2012 3:49:11.053 AM	21/04/2012 3:57:55.480 AM	FAILED	1000	1999	1200

Step 2: To keep it simple, a single data table is used. You need to define a job and its steps. A job can have more than one steps. Each step can have a reader, processor, and a writer. An ItemReader will read data from the accounts table shown below for account numbers between account_from and account_to read from the batch_control table shown above. An ItemProcessor will calculate the availbale_cash and an ItemWriter will update the available_cash on the accounts table.

account_no	account_name	debit	credit	available_cash
001	John Smith	200.00	4000.0	0.0
1199	Peter Smith	55000.50	787.25	0.0

Step 3: Once the batch job is completed, the batch_contol table will be updated accordingly.

Step 4: Listeners can be used to process errors (e.g. onProcessError(....), onReadError(....), etc) and other pre and post item events like beforeRead(...), afterRead(...), etc. The spring-batch framework make use of the configuration xml file, for example batch-context.xml and the Java classes annotated with @Component to wire up the components and implement the logic.

Step 5: The batch job can be executed via a shell or batch script that invokes the spring-batch framework as shown below. The CommandLineJobRunner is the Spring class that initiates the job by wiring up the relevant components, listeners, daos, etc via the configuration file batch-context.xml. The job parameter that is passed is "accountValueUpdateJob1", which is used to retrieve the relevant job metatdata from the job control table.

my_job_run.sh  accountValueUpdateJob1 accountValueUpdateJob1.log
   $0                 $1                    $2

The my_job_run.sh looks something like

...
JOB_CLASS=org.springframework.batch.core.launch.support.CommandLineJobRunner
APPCONTEXT=batch-context.xml
SPRING_JOB=availableBalanceJob
CLASSPATH=$JAVA_HOME/bin:....................... 
JOB_TO_RUN=$1
...

# the jobParameter is jobName. It is passed via job script argument <jobNameToRun>.
$JAVA_HOME/bin/java -classpath ${CLASSPATH} ${JOB_CLASS} ${APPCONTEXT} ${SPRING_JOB} jobName=${JOB_TO_RUN}"

Step 6: The shell script (e.g. my_job_run.sh) or batch file will be invoked by a job scheduler like quartz or
Unix cron job at a particular time without any human intervention.

This is basically the big picture. The wiring up of spring-batch will be explained in a different post.

How to Convert InputStream to Byte Array in Java 2 Examples

Sometimes we need to convert InputStream to byte array in Java, or you can say reading InputStream as byte array, In order to pass output to a method which accept byte array rather than InputStream. One popular example of this, I have seen is older version of Apache commons codec, while converting byte array to hex string. Though, later version of same library do provide an overloaded method, to accept InputStream. Java File API provides excellent support to read files like image, text as InputStream in Java program, but as I said, sometime you need need String or byte array, instead of InputStream . Earlier we have seen 5 ways to convert InputStream to String in Java , we can use some of the techniques from there while getting byte array from InputStream in Java. If you like to use Apache commons library, which I think you should, there is a utility class called IOUtils, which can be used to easily convert InputStream to byte array in Java. If you don't like using open source library for such kind of thinks, and like to write your own method, you can easily do so by using standard Java File API. In this Java tutorial we will see examples of both ways to convert InputStream to byte array in Java.

10 Example of Hashtable in Java – Java Hashtable Tutorial

These Java hashtable Examples contains some of the frequently used operations on hastable in Java. when I discussed throw of How HashMap or Hashtable works in Java I touched based on inner working of hastable, while in this java hashtable tutorial we will see some examples of hashtable in Java like checking a key exits in hashmap or not or getting all keys and values from HashMap , Iterating on hashtable keys and values using Enumeration etc.

Why use Override annotation in Java Coding Best Practice

@Override annotation was added in JDK 1.5 and it is used to instruct compiler that method annotated with @Override

is an overridden method from super classor interface. Though it may look trivial @Override is particularly useful while

overriding methods which accept Object as parameter just like equals, compareToor compare() method of Comparator

interface. @Override is one of the three built in annotation provided by Java 1.5, other two are @SuppressWarnings and @Deprecated. Out of these three @Override is most used because of its general nature, while @SuppressWarnings is also used while using Generics, @Deprecated is mostly for API and library. If you have read my article common errors while overriding equals method than you have see that one of the mistake Java programmer makes it, write equals method with non object argument type as shown in below example:

5 ways to check if String is empty in Java examples

String in Java is considered empty if its not null and it’s length is zero. By the way before checking length you should verify that String is not null because calling length() method on null String will result in java.lang.NullPointerException. Empty String is represented by String literal “”. Definition of empty String may be extended to those String as well which only contains white space but its an specific requirement and in general String with white space are not considered as empty String in Java. Since String is one of the most frequently used class and commonly used in method arguments, we often needs to check if String is empty or not. Thankfully there are multiple ways to find if String is empty in Java or not. You can also count number of characters in String, as String is represented as character arrayand decide if String is empty or not. If count of characters is zero than its an empty String. In this Java String tutorial we going to see 5 ways to find if any String in Java is empty or not. Here are our five ways to check empty String :

How to get environment variables in Java Example Tutorial

Environment variables in Java

There are two ways to get environment variable in Java, by using System properties or by using System.getEnv(). System properties provides only limited set of predefined environment variables like java.classpath, for retrieving Java Classpath or java.username to get User Id which is used to run Java program etc but a more robust and platform independent way of getting environment variable in Java program on the other hand System.getEnv() method provide access to all environment variables inside Java program but subject to introduce platform dependency if program relies on a particular environment variable. System.getEnv() is overloaded method in Java API and if invoked without parameter it returns an unmodifiable String map which contains all environment variables and there values available to this Java process while System.getEnv(String name) returns value of environment variable if exists or null. In our earlier posts we have seen How to get current directory in Java and How to run shell command from Java program and in this Java tutorial we will see how to access environment variable in Java.

How to get environment variables in Java - Example

How to get value of environment variable in Java - example tutorial

Here is a quick example on How to get environment variable in Java using System.getEnv() and System.getProperty(). Remember System.getEnv() return String map of all environment variables while System.getEnv(String name) only return value of named environment variable like JAVA_HOME will return PATH of your JDK installation directory.

/**
* Java program to demonstrate How to get value of environment variables in Java.
* Dont confuse between System property and Environment variable and there is separate
* way to get value of System property than environment variable in Java, as shown in this
* example.
*
* @author Javin Paul
*/

public class EnvironmentVariableDemo {

public static void main(String args[]){

//getting username using System.getProperty in Java
String user = System.getProperty("user.name") ;
System.out.println("Username using system property: " + user);

//getting username as environment variable in java, only works in windows
String userWindows = System.getenv("USERNAME");
System.out.println("Username using environment variable in windows : " + userWindows);

//name and value of all environment variable in Java program
Map<String, String> env = System.getenv();
for (String envName : env.keySet()) {
System.out.format("%s=%s%n", envName, env.get(envName));
}

}

}

Output:
Username using system property: harry
Username using environment variable in windows : harry
USERPROFILE=C:Documents and Settingsharry
JAVA_HOME=C:Program FilesJavajdk1.6.0_20
TEMP=C:DOCUME~1harryLOCALS~1Temp

Getting environment variable in Java – Things to remember

Java is platform independent language but there are many things which can make a Java program platform dependent e.g. using a native library. Since environment variables also vary from one platform to another e.g. from windows to Unix you need to be bit careful while directly accessing environment variable inside Java program. Here are few points which is worth noting :

1) Use system properties if value of environment variable is available via system property e.g. Username which is available using "user.name" system property. If you access it using environment variable directly you may need to ask for different variable as it may be different in Windows e.g. USERNAME and Unix as USER.

2) Environment variables are case sensitive in Unix while case insensitive in Windows so relying on that can again make your Java program platform dependent.

3) System.getEnv() was deprecated in release JDK 1.3 in support of using System.getProperty() but reinstated again in JDK 1.5.

Thats all on how to get environment variable in Java. Though you have convenient method like System.getEnv() which can return value of environment variable, its better to use System.getProperty() to get that value in a platform independent way, if that environment variable is available as system property in Java.

Other How to tutorials from Javarevisited Blog

How to convert Enum to String in Java

How to convert String to Integer in Java

How to convert String to Double in Java

How to convert Date to String in Java

How to write Generics method in Java

How to use Enum in Java program

How to use variable argument in Java program

Spring Framework Tutorial How to call Stored Procedures from Java using IN and OUT parameter example

Spring Framework provides excellent support to call stored procedures from Java application. In fact there are multiple ways to call stored procedure in Spring Framework, e.g. you can use one of the query() method from JdbcTemplate to call stored procedures, or you can extend abstract class StoredProcedure to call stored procedures from Java. In this Java Spring tutorial, we will see second approach to call stored procedure. It's more object oriented, but same time requires more coding. StoredProcedure class allows you to declare IN and OUT parameters and call stored procedure using its various execute() method, which has protected access and can only be called from sub class. I personally prefer to implement StoredProcedure class as Inner class, if its tied up with one of DAO Object, e.g. in this case it nicely fit inside EmployeeDAO. Then you can provide convenient method to wrap stored procedure calls. In order to demonstrate, how to call stored procedures from spring based application, we will first create a simple stored proc using MySQL database, as shown below.

How to convert decimal to binary octal and hex String in Java Program

This article is about a simple java program which converts decimal number to binary, octal and hexadecimal format. When it was first came into my mind I though I would probably need to write whole code to convert decimal to various other radix or base numbers but when I looked Integer class and saw these two way of converting decimal to binary etc I was simple amazed. It’s indeed extremely easy to do this in java and you can also write this program or use at it is.

Converting decimal to binary in Java Example

convert decimal number to binary in java example

Java has many ways to change number system of particular number, you can convert any decimal number into either binary system, hexadecimal system or octal system by following same procedure. here is code example of converting any decimal number into binary number in Java.

//first way

//decimal to binary

String binaryString = Integer.toBinaryString(number);

System.out.println("decimal to binary: " + binaryString);

//decimal to octal

String octalString = Integer.toOctalString(number);

System.out.println("decimal to octal: " + octalString);

//decimal to hexadecimal

String hexString = Integer.toHexString(number);

System.out.println("decimal to hexadecimal: " + hexString);

//second way

binaryString = Integer.toString(number,2);

System.out.println("decimal to binary using Integer.toString: " + binaryString);

//decimal to octal

octalString = Integer.toString(number,8);

System.out.println("decimal to octal using Integer.toString: " + octalString);

//decimal to hexadecimal

hexString = Integer.toString(number,16);

System.out.println("decimal to hexadecimal using Integer.toString: " + hexString);

Nice and little tip to convert decimal to binary or decimal to Octal, hex. This comes very handy many times when we want to do a quick conversion.

Related Java Tutorials

Advanced usage of Enum in Java with Example

Generics in Java Explained with Example

How to use Variable Argument List in Java

Difference between StringBuffer and StringBuilder in Java
How to convert Integer to String in Java

How to Split String in Java

Black Layer Mask in Photoshop

You must have used a White Layer mask in Photoshop often. Have you ever used a Black layer Mask? Do you know what can be done with it?

These are two free stock images, which need to be blended together.

The two images have been blended seamlessly and some other effects have been added. It can be done in any version of Photoshop.

The tutorial is here

Other photoshop tutorials are here

Auto Tone Auto Contrast and Auto Color in Photoshop CS4

This is a follow up tutorial on using Auto Tone, Auto Contrast and Auto Color in Photoshop CS4

This is a free stock image which I will improve in just a few steps.

The photo has been improved. The tutorial is here

Other photoshop tutorials are here

Phone Shaped Pop ups In Lower Right Hand Corner and Random Redirects Uninstall Guide

Some of our readers have been having an awful time trying to remove malicious software that constantly redirects them to spam or even malicious websites while browsing the net and displays either a square or phone shaped pop-up in the bottom right hand corner of their web browsers. Sometimes a pop-up window resembles a video screen of ads, please see the images below.

Previously, we wrote about Trojans horses that had a very similar payload. These Trojans displayed "Recommended for You" pop-ups in the lower corner of the web browser. It actually doesnt matter which browser you use because this happens on all major web browsers, whether it would be Internet Explorer, Mozilla Firefox or Google Chrome. Cyber criminals decided to remove "Recommended for You" notification from their ads probably because victims could easily Google this text and find out that their computers are infected with malicious software. Now, they usually display a smart phone shaped ads with links and also video screen ads.

Here’s what a typical phone shaped ad looks like:

And here’s another one titled "you are missing a plugin to play videos".

A slightly different approach but we believe its still very effective. At the time of writing, this fake fake video update ad was redirecting users to two different websites but they both promoted the same free video player. Most likely, cyber crooks earned commissions from every successful install they made. While thats clearly not the most profitable traffic monetization model we’ve seen so far, it’s still an option and cyber crooks successfully use it.

We found at least three different Trojans horses that have exactly the same payloads: web browser redirect + annoying phone shaped pop-ups. Of course, there might be hundreds of them but we were looking at the most popular ones. All these Trojans displayed pop-ups in the bottom right hand corner of the web browsers and redirected users to spam websites. Now, one of those Trojans used very aggressive methods o hide its presence on the infected computer. It even made our antivirus software to disappear. That means we have encountered different families of Trojans.

What is more, very often these Trojans come bundled with rootkits which makes the removal procedure a lot more complicated than just simply removing a Trojan horse. Most antivirus programs handle Trojan horses very well but fail to remove rootkits. Thankfully, you can use free utilities to remove rootkits from infected computers, for example TDSSKiller, if your antivirus program cant remove them.

One more thing about this infection – it changes Windows Hosts file. Normally, it doesnt lock the Hosts file itself but weve seen a couple of Trojans that not only changes the file so that it would load spammy sites but also prevent further modifications. So, if you can remove malicious lines manually, please use this great Microsoft utility called "Fix it".

To remove phone shaped pop-ups in the bottom right hand corner of your web browser, please follow the removal instructions below. Should you need any further assistance, dont hesitate to contact us or just leave a comment below. Good luck and be safe online!

http://deletemalware.blogspot.com

Removal instructions:

1. Download recommended anti-malware software (direct download) and run a full system scan to remove this malware from your computer.

3. To reset the Hosts file back to the default automatically, download and run Fix it and follow the steps in the Fix it wizard.

4. Remove files from Windows %Temp% folder.

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