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Introduction to the OrientDB Java APIs   1. Overview OrientDB is an open source Multi-Model NoSQL database technology designed to work with the Graph, Document, Key-Value, GeoSpatial and Reactive models while managing queries with SQL syntax. In this article, we’ll cover the setup and use the OrientDB Java APIs. 2.… Continue Reading java-orientdb

Introduction to ORMLite 1. Overview ORMLite is a lightweight ORM library for Java applications. It provides standard features of an ORM tool for the most common use cases, without the added complexity and overhead of other ORM frameworks. It’s main features are: defining entity classes by using Java annotations extensible… Continue Reading ormlite

The DAO Pattern in Java 1. Overview The Data Access Object (DAO) pattern is a structural pattern that allows us to isolate the application/business layer from the persistence layer (usually a relational database, but it could be any other persistence mechanism) using an abstract API. The functionality of this API… Continue Reading java-dao-pattern

A Simple Guide to Connection Pooling in Java 1. Overview Connection pooling is a well-known data access pattern, whose main purpose is to reduce the overhead involved in performing database connections and read/write database operations. In a nutshell, a connection pool is, at the most basic level, a database connection… Continue Reading java-connection-pooling

HBase with Java 1. Overview In this article, we’ll be looking at the HBase database Java Client library. HBase is a distributed database that uses the Hadoop file system for storing data. We’ll create a Java example client and a table to which we will add some simple records. 2.… Continue Reading hbase

Double Dispatch in DDD 1. Overview Double dispatch is a technical term to describe the process of choosing the method to invoke based both on receiver and argument types. A lot of developers often confuse double dispatch with Strategy Pattern. Java doesn’t support double dispatch, but there are techniques we… Continue Reading ddd-double-dispatch

A Guide to Multitenancy in Hibernate 5 1. Introduction Multitenancy allows multiple clients or tenants use a single resource or, in the context of this article, a single database instance. The purpose is to isolate the information each tenant needs from the shared database. In this tutorial, we’ll introduce various… Continue Reading hibernate-5-multitenancy