JVM Task manager memory inconsistency - Resource Monitor

Reason Why JVM And Task Manager Display Inconsistent Memory Usage

The Task manager not just shows heap/ non-heap memory, but many other numbers determined by the OS.

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Deploying Polyglot (RDBMS + NoSQL) Applications on Openshift

Introduction Platform as a Service (PaaS) takes care of infrastructure, middleware, configuration and other platform related worries from developers and allows them to focus on their key competence, i.e. designing and developing their domain applications. In this article I am going to demonstrate how to build a “Polyglot Application” involving data storage and retrieval in…

Play! NoSQL (Building NoSQL applications with Play framework)

Accessing Databases with Play! Framework Play Framework is a high velocity web framework for Java and Scala. It’s built to make application development faster and glitch free. Play! provides a plugin for managing JDBC connection pools. So, if you’re working with relational databases, all you’ve to do is to define database connector dependencies in its build…

Marrying JPA with graph databases

For a month or two, I have been exploring Neo4J, a graph database built for storing huge amount of data. Other popular graph database, that I will be dwelling into is InfiniteGraph from Objectivity. I have also been working on Kundera (A JPA 2.0 based object-datastore mapping library for NoSQL datastores) as a key contributor. It already supports…

Writing Geospatial Queries for MongoDB in Java

MongoDB supports 2-dimensional geospatial indexes. This presentation will help you understand it at a basic level. In this article, I will help you quickly write Geospatial queries described in above presentation using Java programming language. Source code for this article is available at this Github project. A repository of Gegraphical Places Below Java class is a…

Your first Hadoop Map-Reduce Job

Introduction Hadoop Map-Reduce is a YARN-based system for parallel processing of large data sets. If you are new to hadoop, first visit here. In this article, I will help you quickly start with writing the simplest Map-Reduce job. This is a famous “Wordcount” MR job and the first one for 90% of the people (if not more).…

Java Server Faces

JSF Quickstart with Richfaces/ Primefaces

When it comes to building rich UI web-application in Java, I always count on JSF. I know there are many who hate JSF, but this article is not about getting into those fights 🙂 As a starter, I always spent hours in resolving Jar dependencies and configuration issues. Many times they are tough to crack as…