Explore the constraints in Hibernate Validator that go beyond the minimal set defined in the Bean Validation specification.
I'm an ex professional software developer currently on a pseudo-sabbatical. I contribute to and author several open source projects including web frameworks and programming languages. I also engage in activism against discriminations of various kinds.
Here's what I've written (so far):
Explore the RxKotlin library, which augments RxJava to make its API look more like idiomatic Kotlin.
Explore how to query a relational database using Exposed framework for Kotlin.
Learn how to use modern Kotlin idioms to instantiate loggers.
Explore how to make a thin jar using Spring Boot Thin Launcher.
Learn about the common ways of configuring and organizing application contexts in a Spring web application.
Learn about a Java library by Atlassian named Fugue that provides a collection of utilities to support Functional Programming.
Learn how to query a relational database using an open source Java library – jdbi.
Learn how to use the Groovy SQL module and how it enhances and simplifies JDBC with closures and Groovy strings.