Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

I'm trying to use JavaMelody Spring Boot Starter (1.72.0) in application built upon Spring Boot 2.0.1.RELEASE which in turn uses HikariCP 2.7.8 connection pool. But the application fails to start d ...

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...

Java object serialization is a feature of the JDK that is far too often overlooked. When a developer puts together a prototype or cooks up a proof of concept, simply saving a serialized Java object to ...

The static and final keyword combination effectively provides a more expressive way to declare unchanging variables, compared with an implementation of the const keyword in Java. In terms of fully ...

We moved recently to Spring Data JPA 2.0.2, Hibernate 5.2.12 and therefore JPA 2.1. Since then some of our database tests became flickering. When they fail, it is because an IllegalArgumentException ...