My learning phase with Hadoop is still continuing. During this phase what I found is a great lack of a comprehensive POC which covers at least a few prominent Hadoop technologies. My POC can… Read More

Online URL expansion service to retrieve the actual destination of a shortened URL (bit.ly, TinyURL, Google URL Shortener etc.) before clicking on it for safe browsing Read More

Raspberry Pi is a low cost, credit-card sized and fastest selling personal computer. In this article, we'll install and configure Oracle Java ME Embedded on a Raspberry Pi Read More

I have been told that, medically, Cucumber can cause indigestion. Let's see Read More

Following exception occurs in Windows for IBM JDK 6 while executing a JUnit testcase which uses JMockit framework, in-spite of enabling the Attach API "-Dcom.ibm.tools.attach.enable=yes" - j… Read More

You are not so strong with SQL or you are not good at programming? And you need to create distributed scalable search on a very large dataset stored in HBase? And you need to achieve NRT (Ne… Read More

Apache Hadoop Development Tools (HDT) is still in development phase. So, no official distribution of Hadoop 2.2.0 Eclipse Plugin is available now. But we can build the same using winghc/hado… Read More

This tutorial will help you to write an annotation based hibernate java program which will save some records into a database and fetch them all using Hibernate API. We will use Maven tool to… Read More

It is affectionately said that what Oracle is to Relational Database, Cloudera is to Hadoop. Most of the Hadoop aspirants, at the beginning of their Hadoop development learning curve, fiddle… Read More

It is a free online tool to extract and view meta tags from a web page Read More

Free tool to find Geo-Location details of an IP Read More

Online free tool to extract internal and external links of image, css, javascript and anchor from a particular web page Read More

In this post, we'll use HDFS command 'bin\hdfs dfs' with different options like mkdir, copyFromLocal, cat, ls and finally run the wordcount MapReduce job provided in %HADOOP_HOME%\share\hado… Read More

Troubleshooting: Cloudera Hue not able to access Solr collections through Search tab assuming both are set up with CDH4 Read More

In the previous post on Build, Install, Configure and Run Apache Hadoop 2.2.0 in Microsoft Windows OS, many people have encountered Maven build failure issue ("[ERROR] class file for org.mor… Read More

Find out your network's public IP address. Click More Details link to get your IP's Geo-Location details as well Read More

I have to observe lots of developers as part of my job description. I sit back and stare at what they do all the time, how they communicate to each other, how they express their ideas and ho… Read More

Free online tool to escape and unescape string for CSV, HTML, Java, Java Script/EcmaScript and XML Read More

Free online tool to convert HTML to plain text by stripping all html tags, unwanted scripts and css styles Read More

Are you serious about speeding up your WordPress-hosted website? If so, chances are high that you have shelled out money for clutter-free codes or designs that will reduce your site's loadin… Read More

URL redirection is a technique to forward the original http request from one location to another several times for different purposes like domain forwarding, URL shortening, privacy protecti… Read More

Tool to encode or decode string for HTML Read More

If you are getting "Exception from container-launch:org.apache.hadoop.util.Shell$ExitCodeException" in FAILED application's Diagnostics (or Command prompt) and "java.lang.NoClassDefFoundErro… Read More

Hibernate Search is a full text search engine built using Apache Lucene framework. Hibernate Search indexes your domain model, keep the index upto date and also performs full text search fun… Read More

If we save a DOM Document to an XML file using javax.xml.transform.Transformer, DOCTYPE declaration gets emitted by default. This example shows how we can retain PUBLIC and SYSTEM id of the… Read More

This tutorial will help you to write your first Hello World Spring program. We will use Maven tool to generate the project and Eclipse IDE to implement a method which will print 'Hello World… Read More

This tutorial describes how an application, deployed in IBM WebSphere Application Server (WAS) can be started or stopped programmatically using Java code. The sample java code invokes and ex… Read More

This article describes how to create a "Hello World" java program using Eclipse IDE. This program will print "Hello World" in the console Read More

This example shows how we can dynamically create an image from a text ('Hello World!') by writing a simple Java Servlet. In the next post, we'll see how this dynamic creation of image can be… Read More

Apache Ant is an XML-based build tool to automate different tasks like compile, assemble, test source code, building deployment packages and run Java applications. This Hello World example s… Read More

Jetty provides Gzip Filter to enable dynamic compression of contents like html, javascript, css etc. A servlet filter 'org.eclipse.jetty.servlets.GzipFilter' needs to be configured in web.xm… Read More

Technology Blog - Java, J2EE, Servlet, JSP, JSF, ANT Script, Hibernate, Spring, Struts, Maven, jQuery, JSON, log4j, EJB, Webservices, xml, xsl, jstl, javascript, html development tutorials… Read More

This simple tutorial describes how you can print "Hello World!" string in your browser by writing a simple JSP (Java server pages) program developed using eclipse IDE Read More

Here we'll see two examples - Copy operation and Traversing a file tree. If you have already worked using JDk 6 or earlier versions then you can see how easy it is to use JDK 7's nio package… Read More

It is always better to get notified as soon as any major issues / exceptions occurred in the Application, instead of manually going thorugh huge logs to find probable exception messages. Apa… Read More

Simple Logging Facade for Java (SLF4J) is an abstraction of different logging frameworks (eg. log4j, java.util.logging, commons logging etc.). This tutorial describes how to configure SLF4J… Read More

Logback is an increasingly popular logging framework intended as a successor to the popular log4j project. It is designed by the founder of log4j. Logback offers many advantages over log4j l… Read More

This example shows how to generate random alpha numeric text which is not easy to guess Read More

Spring AOP uses either JDK dynamic proxies or CGLIB to create the proxy for a given target object. If the target object to be proxied, does not implement any interfaces then a CGLIB proxy wi… Read More

This tutorial will help you to write your first Android 'Hello World!' program. Here, we'll use Eclipse IDE with Android Development Tools (ADT) plugin to build the application and Android E… Read More

Android application package file (APK) is program binary used to distribute and install Android application onto the Android operating system. Here we'll see step by step procedure of creati… Read More

AppFog Cloud Platform is built by using the Cloud Foundry OSS bits alongside its own set of custom extensions and enhancements. AppFog provides good command line tool to deploy application b… Read More

ESP8266 can act as both Station / WIFI client (STA_IF interface) and Access Point (AP_IF interface). AP_IF interface is active by default in MycroPython firmware on ESP826 . In the earlier p… Read More

By default, ESP8226 module comes with AT Firmware. In this post, we'll see how to flash MicroPython firmware onto an ESP8266 ESP-12E chip using esptool Read More

So far, we have flashed MicroPython firmware onto an ESP8266 and setup WebREPL to run programs over WIFI on the chip. Now it's time for a hands-on excercise. We'll remotely switch on/off and… Read More

To uninstall OpenCV (Open Source Computer Vision) from Raspberry Pi (Raspbian Jessie), follow the steps mentioned below in this article Read More

In this post, we'll see how to get started with a Spring Web model-view-controller (MVC) framework based Hello World web application in few steps. Here, we have used m2e-wtp (Maven Integrati… Read More

WebREPL daemon auto-start is disabled by default in MycroPython on ESP8266 for security reason. Here, we'll enable the same, connect to the REPL over WIFI using locally installed WebREPL cli… Read More

Free online tool to Encode or decode URL / Link or Form Parameter Read More

Spring Security provides Logout Handling Service for logging out by navigating to a particular URL (by default /j_spring_security_logout). LogoutFilter starts processing when a request comes… Read More

Eclipse platform provides different useful Ant tasks to interact with the workspace. If you have added any such Ant task (say eclipse.refreshLocal) in your ant build script and started getti… Read More

reCAPTCHA is a free CAPTCHA service to protect a site against spam and other types of automated abuse by bots or computer programs. reCAPTCHA provides widget which can easily be integrated t… Read More

This example shows how an element of a java.util.ArrayList can be searched using 'binarySearch' method of java.util.Collections class. This method internally applies binary search algorithm… Read More

In previous posts Spring Security 3 Hello World Example and Spring Security Logout Example, we have used default login form generated by Spring Security framework. Now we'll set up a custom… Read More

Are you planning to buy a Google's Chromebook? Want to experience how it looks like before you decide? Then this is the post worth looking into. Here we'll see how to setup, run and explore… Read More

Hadoop Eclipse plug-in (installed in Eclipse IDE or Spring Tool Suite) eases the experience of Map/Reduce on Hadoop. Hadoop distribution does not include Hadoop Eclipse plug-in jar, but incl… Read More

HTTP basic authentication (BA) is a simple authentication mechanism. When a web client requests any secured web resources, server sends an HTTP response with status code 401 (Unauthorized) a… Read More

If we directly take the binary distribution of Apache Hadoop 2.2.0 release and try to run it on Microsoft Windows, then we'll encounter ERROR util.Shell: Failed to locate the winutils binary… Read More

Security is of great concern in any web application. If you are looking for a proven and industry standard solution to secure your Java/J2ee based application, then widely used and highly cu… Read More

This post describes how to make an HTML table (having THEAD and TBODY) sortable in few minutes using tablesorter jQuery plugin. This plugin can parse and sort many types of data like number… Read More

This example shows how to determine click position (row and column number) on click of a table cell using jQuery Read More

Free online tool to extract embedded JavaScript code from a web page Read More

This simple tutorial explains you, how you can run your first Servlet class that will print "Hello World!" string in the browser. We will use Eclipse IDE to develop the code and Tomcat webse… Read More

Many websites use URL redirection technique to forward the original request from one location to another several times for different reasons (Domain forwarding, URL shortening, Privacy prote… Read More

Online tool to extract and view HTTP response headers for a web page. Uncheck checkbox if you do not want to follow redirections of a URL Read More

Sonar is an open source platform for code quality management. It covers different aspects of code quality management like code duplication, complexity, coverage by unit tests, architecture a… Read More

Good news for Hadoop developers who want to use Microsoft Windows OS for their development activities. Finally Apache Hadoop 2.2.0 release officially supports for running Hadoop on Microsoft… Read More

URL deobfuscator tool to simplify complex looking encoded URL and extract information stored in it Read More

Nowadays we use different URL shortening services (like bit.ly, TinyURL, Google URL Shortener etc.) to shorten long URL to fit in micro-blogging sites (like Twitter), to beautify a link, vie… Read More

If you have migrated / upgraded your project to Spring Framework 3.2 and project builds successfully but when application starts, you are getting IncompatibleClassChangeError, then this post… Read More

By default, HTTPS / SSL is not configured and enabled in Tomcat Web server. SSL setup is required to make your web application accessible over HTTPS protocol. This post will guide you to con… Read More

Spring Mobile is an extension to Spring MVC for development of mobile web applications. The Spring Mobile Device module provides a feature (DeviceResolver / LiteDeviceResolver) to detect dev… Read More

Simple Logging Facade for Java (SLF4J) is an abstraction of different logging frameworks (eg. log4j, java.util.logging, commons logging etc.). This gives the developer an opportunity to plug… Read More

This example shows how we can traverse a folder or directory structure using recursive algorithm by writing a small java program using Java File API Read More