Java -

Database integration tests for a Spring application

Jan 12, 2019 | 6 minutes Java

Suppose you are tasked with writing tests for a Spring and Hibernate application. This application uses a mix of native queries, HQL or entity associations to fetch data from the … [Read more]

Using thread dumps to analyse deadlocks

Oct 14, 2017 | 2 minutes Java

In a multi-threaded Java application, a deadlock occurs when two threads wait forever attempting to acquire locks that are held by each other. Here’s a simple example to simulate a … [Read more]

Running time intensive operations in parallel with RxJava Observables

Sep 1, 2016 | 4 minutes Java

Recently I delved into the RxJava library. In this post I will demonstrate how RxJava Observables can be used to execute two long running tasks in parallel, so as to reduce their … [Read more]

Logging with Spring AOP

Feb 12, 2016 | 3 minutes Java

Aspect oriented programming (AOP) is a way of separating the business login in your code from cross cutting concerns. What is a cross cutting concern? Analogy time. A typical house … [Read more]

Memory profiling – simple examples

Feb 4, 2016 | 5 minutes Java

Recently I have been trying to learn different memory profiling tools to monitor Java applications. I have looked into the command line tools that are shipped as part of JDK like … [Read more]

JPA Entity Relationships

Jan 15, 2016 | 7 minutes Java Database

In a relational database, the relationships between two tables are defined by foreign keys. Typically, one table has a column that contains the primary key of another table’s row. … [Read more]

Introduction to jdb

Jan 11, 2016 | 4 minutes Java

jdb (Java Debugger) is a simple command-line debugger for Java classes that is provided as part of the JDK tools and utilities. jdb is based on a server-client model. While … [Read more]

Step by step guide to set up a service discovery environment

Dec 17, 2015 | 4 minutes Java Microservices

In a microservices environment we can run multiple instances of a service for resilience and scalability. In a cloud environment these instances can go up and down arbitrarily. So … [Read more]

How to set up a local spring cloud config server

Dec 15, 2015 | 4 minutes Java Microservices

From the official documentation, Spring Cloud Config provides server and client-side support for externalized configuration in a distributed system. With the Config Server you have … [Read more]

Building with Gradle

Oct 24, 2015 | 6 minutes Java

Gradle is a popular build tool to manage Java projects. Gradle’s build scripts are written in Groovy. The design of Gradle is aimed to be used as a language, not as a rigid … [Read more]