What is NullPointerException in Java, and how to avoid and fix it?

In Java NullPointerExceptions are exceptions that occur when we try to use a reference that points to no location in memory (Know as null) as though it were referencing an object (uninitialized objects or assigned to null object references). Calling a method or accessing a member on a null reference will throw a NullPointerException. Generally, Read More …

Installing and Configuring Apache ActiveMQ on Ubuntu 18

Apache ActiveMQ ™ is one of the most popular and powerful open source JAVA based messaging and Integration Patterns server. This supportes many protocols and provides client library for many platforms and languages. Apache ActiveMQ is a message broker server written in Java with JMS, REST and WebSocket interfaces, however it supports many protocols like Read More …