The top 5 most recognized on GitHub JVM flavors alternative to OpenJDK include: - GraalVM CE(18.3K+ stars) - JVM.go(3.5K+ stars) - Eclipse OpenJ9 (3.1K stars) - Amazon Corretto (2K+ stars) - Codename One (1.4K+ stars)

OpenJDK vs. Amazon Corretto - Amazon Corretto is developed and supported by Amazon Web Services

OpenJDK vs. Amazon Corretto - Amazon Corretto is optimized for the cloud

OpenJDK vs. GraalVM - GraalVM is optimized for performance; hence provides faster startup and a lower memory footprint

1/ GraalVM - the price of performance: - no classloading, and for that reason, only classes being traced at the image build process are available

2/ GraalVM - the price of performance: - some parts of the heap are pre-initialized

3/ GraalVM - the price of performance: - no support for profilers

4/ GraalVM - the price of performance: - no Java agents

5/ GraalVM - the price of performance: - efficient only with smaller heap due to SerialGC

6/ GraalVM - the price of performance: - no thread dump and heap dump support

7/ GraalVM - the price of performance: - only partial support for reflection, and this may affect any library which utilizes this feature

GraalVM vs. OpenJ9: - OpenJ9 also promises performance while doing fewer feature restrictions to accomplish it

OpenJ9 has both a just-in-time compiler and an ahead-of-time compiler.

OpenJ9 has a class data-sharing feature.

Unlike GraalVM, OpenJ9 has many garbage collector policies.

Codename One is a project letting you transpile your #Java code to native for mobile devices.

scala-exercises.org lets you practice with some common #Scala features and libraries.

scala-exercises.org features the following to practice with: - Scala standard lib - Cats - Shapeless - Doobie - Circe - Fetch - Monocle

Why is it essential to practice Cats or Shapeless? - because these are Functional feature additions to #Scala and are important to train yourself going in the direction of a more Functional programming style Hear more about #Scala here: proscala.com/podcasts/episo…

Cats library includes a series of type classes to which specific rules apply. Hear more about #Scala here: proscala.com/podcasts/episo…