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Clojure Programming Cookbook

You're reading from   Clojure Programming Cookbook Handle every problem you come across in the world of Clojure programming with this expert collection of recipes

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Product type Paperback
Published in Oct 2016
Publisher Packt
ISBN-13 9781785885037
Length 618 pages
Edition 1st Edition
Languages
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Authors (2):
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Nicolas Modrzyk Nicolas Modrzyk
Author Profile Icon Nicolas Modrzyk
Nicolas Modrzyk
Makoto Hashimoto Makoto Hashimoto
Author Profile Icon Makoto Hashimoto
Makoto Hashimoto
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Toc

Table of Contents (11) Chapters Close

Preface 1. Live Programming with Clojure FREE CHAPTER 2. Interacting with Collections 3. Clojure Next 4. File Access and the Network 5. Working with Other Languages 6. Concurrency and Parallelism 7. Advanced Tips 8. Web Applications 9. Testing 10. Deployment and DevOps

Calling Clojure from Java


In this recipe, we will learn how to define Java classes in Clojure and call them from Java.

Getting ready

To include Java sources in a Leiningen project, we create the project.clj as follows and restart the REPL:

(defproject chapter05 "0.1.0-SNAPSHOT" 
  :description "FIXME: write description" 
  :url "http://example.com/FIXME" 
  :license {:name "Eclipse Public License" 
            :url "http://www.eclipse.org/legal/epl-v10.html"} 
  :java-source-paths ["src/java"] 
  :aot [chapter05.calling-from-java] 
  :prep-tasks [ 
               ["compile" "chapter05.calling-from-java"] 
               "javac" "compile" ] 
  :main chapter05.TestHello 
  :dependencies [[org.clojure/clojure "1.8.0"] 
                 ]) 

How to do it...

We will take a look at how we define Java classes that can be called from Java.

Defining a simple named class using gen-class

The following code is a very simple code to print string...

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