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How to Write an Equality Method in Java by Martin Odersky, Lex Spoon, and Bill Venners June 1, 2009 equals method that preserves the contract of equals even when subclassses of concrete classes add new fields. In Item 8 of 1, Josh Bloch describes the difficulty of preserving the equals contract when subclassing as a “fundamental problem of equivalence relations in object-oriented languages.” Bloch writes: There is no way to extend an instantiable class and add a value component while preserving the equals contract, unless you are willing to forgo the benefits of object-oriented abstrac...

Copy JetBrains has released TeamCity Cloud, a hosted version of its Continuous Integration (CI) tool, with support for Kotlin DSL (Domain Specific Language) for configuring build pipelines. TeamCity was first released in 2006 but to date has only been an on-premises product. Its role is to run tests and builds so that code changes are compiled and (insofar as it can be automated) verified as ready for deployment. TeamCity does not itself build software, but instructs agents on build servers. An entire CI pipeline includes test, build and deployment, often to a staging server prior to producti...

9 hours ago Azul more than doubled its channel partner count and saw significant channel success in 2020 SUNNYVALE, Calif.–(BUSINESS WIRE)–Azul, provider of the world’s most trusted open-source Java platform, today announced that in 2020 it more than doubled the number of channel partners that sell, support and enable its products. The company signed 27 new partners worldwide last year, bringing the total to 53 at the end of 2020 and closed several seven-figure dollar transactions led by partners. Over the last two years, Azul has increased its channel bu...

Build Even Faster Quarkus Applications With fast-jar Quarkus is already fast, but what if you could make inner loop development with the supersonic, subatomic Java framework even faster? Introducing the fast-jar format! by Join the DZone community and get the full member experience.Join For Free Quarkus is already fast, but what if you could make inner loop development with the supersonic, subatomic Java framework even faster? Quarkus 1.5 introduced fast-jar, a new packaging format that supports faster startup times. Starting in Quarkus 1.12, this great feature became the default packaging ...

by GraalVM has released major version 21.0 with a new component, Java on Truffle, that provides a Java Virtual Machine (JVM) implementation written in Java. GraalVM is itself a polyglot virtual machine that provides a shared runtime to execute applications written in multiple languages like Java, Python, and JavaScript. Prior to this release, running Java applications in GraalVM was possible by using the Java HotSpot VM with the GraalVM Just-In-Time (JIT) compiler, or by compiling to a native executable using GraalVM Native Image. With this release, Java on Truffle, a JVM written in Java usin...