Can you mix the JVM languages? ie: Groovy & Clojure

Question

I understand that you can easily mix groovy&java, clojure&java, whateverJvmLang&java.

Does this also mean I can have clojure and groovy code interact as well

Answer 1

As already mentioned, you can access Clojure classes from Groovy via pre-compilation.

You can access most popular scripting languages via Java 6's scripting API as well, though Scala and Clojure don't seem to be officially supported. Here are examples from Groovy:

http://groovy.codehaus.org/JSR-223+access+to+other+JVM+languages

You can also get access to Clojure's classes from Groovy, e.g. (for Groovy 1.7 snapshot):

@Grab(group='org.clojure', module='clojure', version='1.0.0')
import clojure.lang.*

def ss = StringSeq.create('The quick brown fox')
def done = false
while (!done) {
  println ss.first()
  ss = ss.next()
  done = !ss
}

Or interact via creating a new Process (again for Groovy 1.7 snapshot):

@Grab(group='org.clojure', module='clojure', version='1.0.0')
import clojure.lang.Script

def src = new File('temp.clj')
src.text = '''
(defn factorial [n]
   (if (< n 2)
       1
       (* n (factorial (- n 1)))))
(println (factorial 4))
'''
def path = System.getProperty('user.home') + '/.groovy/grapes/org.clojure/clojure/jars/clojure-1.0.0.jar'
new AntBuilder().with {
    java(classname:Script.name, classpath:path) {
        arg(value:src.path)
    }
}

There is also a Clojure plugin for Grails which provides easy access to execute clojure code from any Grails artifact (controllers, taglibs, services etc...):

http : / / grails.org/plugin/clojure