This shows basic lack of understanding from someone who has never been a programmer. Java is a programming language. It's Oracle's applet (web browser plugins) that has security issues. It's much easier to write secure software in Java than in C. There Is also OPenJDK which is free and open source.
Java remains the most popular programming language for server side. If you have ever used Amazon and Ebay, the server side was run by Java. Almost all banks use Java on server side. So you already use Java as client everyday.
NRS is a server application (it's not a browser applet with security problems). The client side can be written in programming language.
No need to explain what is java, I know. They use only servlets, not the rest.
Java is a programming language interpreted by the JVM (java virtual machine) and when you install it or update it, it tries to install a shitty toolbar.
But I am ok with you, it's much easier to write in Java than in C...