Adam Gamboa G – Developer – Full Stack notes and tips for developers… Java, React, Kubernetes, Scala, and more…

Sealed classes are an enhancement to the language included with LTS version 17 (included since version 16) of Java. Sealed classes or interfaces allow us to restrict what other classes and interfaces can extend from them.

Lock mechanism using Files on Java

Java

November 18, 2021November 18, 2021 agamboa No comments

Using Java NIO we can implement a locking mechanism, to access resources concurrently safely and maintaining the integrity of our information.

Picocli – Easiness for CLI arguments in Java

Java

October 27, 2021October 28, 2021 agamboa No comments

Picocli, defines itself as the easiest way to create a rich cli application for JVM and no JVM environments.

Connecting shell to a Node in Kubernetes

Kubernetes

October 7, 2021October 8, 2021 agamboa No comments

In case of requering to access a kubernetes node via shell with the nsenter script or the kubectl-ssh plugin we can do it. Without requiring SSH Keys, VPN, Bastion or credentials.

Using collect in Scala

Scala

September 30, 2021September 30, 2021 agamboa No comments

An advantage of Scala to Java is the number of method to use on collections (List, Seq, Buffer, etc), and implement the functional programming approach simplifying our code. In this article, we will understand the usage of the collect method and its benefits.

Effective data load in JPA with Entity Graph

Java

August 21, 2021August 27, 2021 agamboa No comments

PA 2.1 has introduced the Entity Graph feature, and it’s a very useful when we need to load data from a relationship in the query, in a different way as the mapped in the entity.