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Calling Clojure from Java

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Jay Fields

Posts: 765
Nickname: jayfields
Registered: Sep, 2006

Jay Fields is a software developer for ThoughtWorks

Calling Clojure from Java

Posted: May 27, 2009 5:46 PM

This post originated from an RSS feed registered with Ruby Buzz by Jay Fields.
Original Post: Calling Clojure from Java Feed Title: Jay Fields Thoughts Feed URL: http://blog.jayfields.com/rss.xml Feed Description: Thoughts on Software Development	Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Jay Fields Latest Posts From Jay Fields Thoughts

Calling Clojure from Java is easy, if you know which classes are important.

On my current project I make all my Clojure files resources, load them, and call the functions directly. The following example shows Clojure printing the argument it's given.

; printer.clj
(ns printer)

(defn print-string [arg]
  (println arg))

// Java calling code
RT.loadResourceScript("printer.clj");
RT.var("printer", "print-string").invoke("hello world");

There's a few things worth noting about the example: RT.var takes the namespace name and the function name. The Var returned by RT.var has an invoke method that allows you to pass any number of Objects. The invoke method also returns an Object, which allows you return values from Clojure where necessary.

It's also worth noting that the Clojure/Java interop is very, very good. You could pass a Java object to Clojure, make changes to it in Clojure, and return it back to Java. Of course, you might not even need to return it to Java since the instance referenced in Clojure would be the same instance referenced in Java.

Read: Calling Clojure from Java

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