What is ElasticSearch?
Elasticsearch is an open-source, restful, distributed, search engine built on top of apache-lucene, Lucene is arguably the most advanced, high-performance, and fully featured...
Elastic Search 2.x sample CRUD code
Sunday, December 27, 2015
Monday, May 11, 2015
ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 0 time(s); retry policy is
15/05/08 01:26:12 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
...
Bad connection to FS. command aborted. exception: Call to localhost/127.0.0.1:9000 failed on...
Hadoop Set Up on Ubuntu Linux (Single-Node Cluster)
Running Hadoop on Ubuntu Linux (Single-Node Cluster)
Hadoop is a framework written in Java, Incorporates features similar to those of the Google File System (GFS) and of the MapReduce computing paradigm....
Saturday, May 9, 2015
Install Ubuntu Linux on Virtual Box
It is always good to have virtual box with our required OS installed, If u have windows box and want to learn hadoop, its good to have virtual box with ubuntu to learn.
Prerequisites :
1. Download...
Tuesday, April 28, 2015
Analyzing the application code by using the sonarqube ANT/MAVEN
SonarQube™ software (previously known as “Sonar”) is an open source project hosted at Codehaus. By using this we can analyze the source code, its very easy to configure and use.
1. Download and unzip...
web service client JAXWS by maven
Generate web service client stub class by using the JAXWS maven plugin.
"jaxws-maven-plugin" will generate the web service stub classes by using that we can implement client or test the web service.
generated stub classes will stored under src folder and by using this service classes we can communicate...
Tuesday, April 14, 2015
JMETER load testing by code/ JMETER API implementation sample by java code
This tutorial attempts to explain the basic design, functionality and usage of the Jmeter, Jmeter is excellent tool used to perform load testing on the application, By using the jmeter GUI we can create...
Wednesday, April 8, 2015
get byte or memory size of array,list,collections in java
In java lot of time we will come across the scenerio where in which we need to find the how much memory used by given list.
The ArrayList holds a pointer to a single Object array, which grows as the number of elements exceed the size of the array. The ArrayList's underlying Object array grows by about...
Monday, March 30, 2015
Generate the bar code image by itext
We can generate a bar code image by using the itext jar.
Itext jar : http://sourceforge.net/projects/itext/
Download jar : http://sourceforge.net/projects/itext/files/latest/download
sample code
import com.itextpdf.text.pdf.BarcodePDF417;
import java.awt.Color;
import java.awt.image.BufferedImage;
import...
Regular expression to extract the src tag details from given image tag or html source text
By using the regular expression we can extract the any data from the given input, here we are trying to get the src attribute value from the given image tag or html text data.
Image 'src' attribute extract Regx:
<img[^>]*src=[\\\"']([^\\\"^']*)
sample code:
import java.util.regex.Matcher;
import...
Compare images are same by java
We can compare the given images are same or not by comparing the buffer data of the image.
1. Compare the image sizes are same or not.
2. Compare the binary data of two images are same or not.
sample code :
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.io.File;
import...
Saturday, March 28, 2015
Reverse elements in Array
Reverse all elements in array, traditional way how we use to do is get the array and iterate through the for loop and use swap logic to move to temporary array and get the result.
But from > jdk 1.5 introduced reverse() in java.util.Collections which will reverse the order of the elements, all we...
