Category: Java

Removing elements from a Map in Java

Very short and simple post on removing elements from a Map in Java. We will be focusing on removing multiple elements and ignore the fact you can remove a single element using Map.remove. The Map below will be used for this post: There are a few ways to remove elements. You could loop through the ...

Extending and Overriding Flows from external CorDapps

Corda 4 was released last week (21st Feb) bringing with it a ton of new features to make Corda more enjoyable to work with. To be honest, I am kind of assuming there are a lot of new features. I had a quick browse through the changelog, mainly to see my contributions being referenced, but ...

Asynchronous RDBMS access with Spring Data R2DBC

Not too long ago, a reactive variant of the JDBC driver was released. Known as R2DBC. It allows data to be streamed asynchronously to any endpoints that have subscribed to it. Using a reactive driver like R2DBC together with Spring WebFlux allows you to write a full application that handles receiving and sending of data ...

Configuring Logback with Spring Boot

Logback is provided out of the box with Spring Boot when you use one of the Spring Boot starter dependencies as they include spring-boot-starter-logging providing logging without any configuration and can be altered to work differently if required. There are two ways of providing your own configuration, if you only need simpler alterations they can ...

Cached Prepared Statements with Spring Data Cassandra

Today I have a short post on using Prepared Statements in Spring Data Cassandra. Spring provides you with some utilities to make using Prepared Statements easier rather than relying on registering queries manually yourself with the Datastax Java Driver. The Spring code provides a cache to store prepared statements that are frequently used. Allowing you ...

Containerising a Spring Data Cassandra application

I'm continuing my journey of learning Docker. I am still keeping it simple at this point. This time around, I am going to tackle converting a Spring and Cassandra application to use containers instead of running locally on the host machine. More precisely, using Spring Data Cassandra to sort out the application. I wish I ...

Using Docker to shove an existing application into some containers

I have finally got round to learning how to use Docker past the level of knowing what it is and does without ever using it. This is the first post that I have attempted to use Docker in and will probably be what I refer to whenever I start a new project (for Java or ...