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Grails is an open source web application framework that uses the Groovy programming language. It is intended to be a high-productivity framework by following the "coding by convention" paradigm, providing a stand-alone development environment and hiding much of the configuration detail from the developer.
In Grails 4.0 Micronaut will take over as the parent context for Grails applications and much of the internal wiring of Grails will be based on Micronaut instead of Spring
Pinei
Software Engineer, Rio, Brazil
Graal is a new just-in-time compiler for the Java Virtual Machine focused on peak performance and multi-language support. Graal offers performance advantages not only to Java code, but also to scripting languages such as JavaScript, Ruby, Python, and R. Additionally, it enables the execution of native code on the JVM via an LLVM-based front end.
Languages are executed by Graal via the Truffle framework, which comes with seamless interoperability and polyglot debugging and profiling functionality.