I'm looking over the C-Sharp client, with an eye towards possibly using it as the basis for a Java version.

Some things are trivial: C# "using" appears to be equivalent to Java "import," and "Environment.GetEnvironmentVariable" is more-or-less equivalent to Java "System.getEnv."

Some things are a bit odd: it took me a while to learn that "int?" just means a nullable int. Maybe use an instance of Integer, instead of a primitive int.

And there's the matter of multiple classes defined in a single source file, without any of them being inner classes. Again, no big deal.

But then, when I was doing a nesting analysis on the C# source, I saw it, in the Callbacks class: an "async Task." I haven't a clue what's going on there, except that I vaguely recall using the Java Thread class. Can anybody shed some light on this?

Or alternatively, is there a practical way for a Tomcat webapp context (which is the real use-case here) to just use a JavaScript front-end, or the JavaScript RPC client?