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with rise of ECMA6 and corresponsing transpiling languages like Typscript and tools like babel , popularity of server side programming on Node with JS has been increasing
It is currently not the language of choice for server side development, It's high usage is a result of legacy code that is too costly to rewrite. Few new projects are utilizing it.
Scala presents a much stronger core language, is able to use JVM libraries and make use of existing Java code and is more "fun" to write than Java. Additionally, it can target JS, and soon Scala-Native will target LLVM. All of this without having to rewrite existing Java projects.
As per W3Tech survey, Java is used 2.7% across its known sites as against 85% of PHP usage. However, PHP plays a bigger role in static websites using Wordpress etc.
Java is a trusted language in terms of security, performance & resource availability perspective.
Python is currently a more popular language for web development
Java has 9 million developers; 3 billion mobile devices are using it; 97% enterprise desktop runs on Java; 125m TV devices using Java and it is #1 development platform.