Get Rhino JS to see Java class

Question

I'm playing with Rhino, and I've had success using Java classes from the stdlib, but not from Java code I compiled here.

For example, this works fine:

print(new java.util.Date());

But with NanoHTTPD (single .java file, no namespace, same folder), I'm having no luck at all:

js> new Packages.NanoHTTPD()
js: "<stdin>", line 4: uncaught JavaScript runtime exception: TypeError: [JavaPackage NanoHTTPD] is not a function, it is object.
    at <stdin>:4

I'm sure it's something simple. What am I missing?

EDIT: I'm launching it like this:

$ CLASSPATH=. java -jar rhino.jar

or this:

$ java -classpath . -jar rhino.jar

Or I moved NanoHTTPD.java into the folder "./nano", added package nano; to the top of the file, compiled it, and then replaced "." with "nano" in the above classpath assignments.

Any way I do it, from in the interpreter I see:

js> java.lang.System.getProperty("java.class.path")
/Users/me/blah/rhino.jar

Answer 1

You need to run Rhino like this:

java -cp /path/to/rhino/js.jar:. org.mozilla.javascript.tools.shell.Main

This adds the current directory to the classpath. Using -jar clobbers the classpath. (The classpath separator depends on your OS.)

Then try

js> Packages.NanoHTTPD
[JavaClass NanoHTTPD]

If it says [JavaPackage NanoHTTPD], it means it hasn't found a class by that name.

You can't instantiate NanoHTTPD anyways, so I'm guessing you want to try Packages.NanoHTTPD.main([]) or something.