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How to Write Node.js Applications in Python using PythonJS on OpenShift
Today I came across an interesting library called PythonJS that converts Python to JavaScript. It converts to JavaScript and generates JavaScript, CoffeeScript, and Dart code for the given Python code....
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PostgreSQL learning
To find out the location of PostgreSQL configuration files, just connect with your PostgreSQL database and run the following command. To describe a table, you should use To list all the databases,you...
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Writing your First Technology Book
So I wrote my first book. It is a great feeling to find your book available on Amazon http://www.amazon.com/OpenShift-Cookbook-Shekhar-Gulati/dp/1783981202/. I have read many motivational books or...
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Writing Test Automation Framework for Installers
Last few weeks I have spent considerable time writing integration test suite for one of our product installers. The goal of this test suite is to automatically test functionality of the product on...
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How to resize a Virtual Box virtual machine hard disk size
Today while working on a project I had to resize hard disk size of one of the virtual machines. The Windows virtual machine was created using veewee. To resize a VM hard disk size, you have to perform...
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Android Studio Mac OSX Installation Error — NoClassDefFoundError: Could not...
Today I decided to play with Android and build a simple app. I downloaded the latest version of Android Studio for Mac from the official website http://developer.android.com/sdk/index.html. As soon as...
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Day 1 — Let’s learn about lambdas
From today, I am kicking off 7 Days with Java 8 blog series with first blog on Lambdas. One of the most important features in Java 8 is the introduction of Lambda expressions. They make your code...
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Day 2 — Let’s learn about Streams
On day 1, we learnt how lambdas can help us write clean concise code by allowing us to pass behavior without the need to create a class. Lambdas is a very simple language construct that helps developer...
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Day 3: Let’s collect data using Stream API
On day 2, you learned that Stream API can help you work with collections in a declarative manner. We looked at the collect method, which is a terminal operation that collects the result set of a stream...
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Day 4 — Let’s write Null free Java code
Every Java developer whether beginner, novice, or seasoned has in his/her lifetime experienced NullPointerException. This is a true fact that no Java developer can deny. We all have wasted or spent...
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Day 5 — Default and static interface methods in Java 8
We all understand that we should code to interfaces. Interfaces give client a contract which they should use without relying on the implementation details(i.e. classes). Hence, promoting loose...
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Docker Machine — dial tcp: i/o timeout error on Mac
Today, while trying to use Docker Machine to create a local docker host on my macbook I was greeted with an exception as shown below. I tried to clear the local docker cache by deleting ~/.docker...
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Building Reactive Apps with RxJava and Java 8
Reactive programming is a programming paradigm geared around propagation of change. In other words, a program is expressed as a reaction to asynchronous event stream. Multiple consumers subscribe to an...
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Gson Tip: Using a different FieldNamingPolicy
Today, while write a client for a REST API I had the need to use a different field naming strategy than the default one. By default, when Gson tries to convert a JSON String to an object it expects...
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Gradle tip: Using gradle plugin from local maven repository
Today, I was trying to use a Gradle plugin that was currently not published to Bintray or any other public repository. I performed following actions to use that plugin in my project. Step 1: Build the...
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GSON tip: @JsonProperty equivalent
Jackson has a very useful annotation @JsonProperty that gives developer the option to provide a name that will be used to map data from JSON to the value object. This is very useful when REST API you...
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Word count example in Java 8
Following code snippet shows how you can write a word count program using Java 8 Stream API. The better solution is using toMap collector as shown below. Even better version can be written using...
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GSON tip: Setting ISO 8601 Date Time format with nano second precision
Today, I had to parse an ISO 8601 date that was returned as part of a JSON response from a REST service. With default settings GSON can’t parse the date like 2015-09-22T17:21:32.70856998Z. To make it...
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Getting Started with vSphere EXSi — The Missing Tutorial
Getting Started with vSphere Today, I got an opportunity to work with vSphere. The plan for the day was to install vSphere on of our machine and then connect to it using a Python API so that we can...
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