Getting Started with Eclipse and Counterclockwise

http://dev.clojure.org/display/doc/Getting+Started+with+Eclipse+and+Counterclockwise

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Install Eclipse (If you do not have Eclipse installed, or you want to make isolated tests of the Clojure plugin for Eclipse)

Grab the Eclipse ZIP file from http://www.eclipse.org/downloads . If you do not know which "package" to get, pick the "Eclipse IDE for Java Developers" one since it ships out of the box with Git support
Unzip it somewhere. The executable is eclipse (linux) or eclipse.exe (windows) located in the eclipse/ directory created by the unzip operation
The first time Eclipse is run, it will ask you for a location on your disk where eclipse will put its metadata and will create new projects by default.

Install Counterclockwise (the Clojure plugin for Eclipse)

You install it via the “software update center”, that is:
Menu Help > Install new software…
Paste the following Counterclockwise url in the “Work with:” textbox: http://ccw.cgrand.net/updatesite/ Hit Enter
Select counterclockwise, verify the “Contact all update sites during …” chekbox is checked, click next, accept licence, etc., restart Eclipse
Go to menu Window > Reset Perspective ... this will reset the way the views are layout, and also and and place correctly the views contributed by counterclockwise (for now - July 2010 -, the Namespace Browser viewer, placed "behind" the code outline view)

Create and run a simple Clojure project (Hello World)

Open the Java perspective: Window > Open Perspective > Java (a perspective is a predefined layout of views, suitable for a particular type of development)
Create a Clojure project: File > New > Project... > Clojure Project, name it firstClojureProject
Create a Clojure source code file in the src/ directory: File > New > File, twist down firstClojureProject in the file creation wizard and select "src" as the ** the parent folder, and name the file helloworld.clj
Type code in it to define a function: (defn hello [who] (str "Hello " who " !")) (leave the (ns helloworld) call at the beginning of the file), save the file
Run it: Select the firstClojureProject>src>helloworld.clj file, then menu Run > Run as > Clojure REPL. this evaluates the code and starts a REPL

Call your function (Hit Ctrl+Enter to send the expression to the REPL server):

> 1:1 helloworld=> (hello "Betty") [Ctrl+Enter]
> "Hello Betty !"

Installing and running the labrepl environment for learning Clojure

If you have installed the "Eclipse IDE for Java Developers" package, you can skip the "Install EGit" and "Install m2e" following steps, since your package already ships with those "Eclipse Features"
Install EGit, Git support in Eclipse (optional if you already use another git client)

You install it via the “software update center”, that is:
Menu Help > Install new software…
Paste the following EGit url in the “Work with:” textbox: http://download.eclipse.org/egit/updates Hit Enter
Select “Eclipse EGit feature”, verify the “Contact all update sites during …” chekbox is checked, click next, accept licence, etc., restart Eclipse

Install m2e, Maven support in Eclipse

You install it via the “software update center”, that is:
Menu Help > Install new software…
Paste the following maven2eclipse (m2e) url in the “Work with:” textbox: http://m2eclipse.sonatype.org/sites/m2e Hit Enter
Select Maven Integration for Eclipse, verify the “Contact all update sites during …” chekbox is checked, click next, accept licence, etc., restart Eclipse
Note: for Maven, you need to have a JDK installed on your computer (not just a JRE), and configure it as the JVM for use when running Eclipse. (Maven gives a warning when Maven is used.)

Grab labrepl from git via EGit

Menu File > Import … > Git > Projects From Git; Hit Next
URI: git://github.com/relevance/labrepl.git ; Hit Next ; Hit Next ; Check "Import as General Project" ; Hit Finish

Enable Clojure Support

Right-click the "labrepl" project in Package Explorer and choose "Enable/disable Clojure language support"

Run the labrepl

Right click on project “labrepl” in the Package Explorer
Run as > Clojure REPL

In the REPL Console:

(require 'labrepl)
(labrepl/-main)

Open your favorite Browser with URL localhost:8080
Enjoy the labs!