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<h2>Pre-requisites</h2><ul><li>Java 6 (for running Eclipse, you can still use Java 5 for your projects)</li></ul><h2>Install Eclipse </h2>(If you do not have Eclipse installed, or you want to make isolated tests of the Clojure plugin for Eclipse)<ul><li>Grab the Eclipse ZIP file from <a href="http://www.eclipse.org/downloads">http://www.eclipse.org/downloads</a> . If you do not know which &quot;package&quot; to get, pick the &quot;Eclipse IDE for Java Developers&quot; one since it ships out of the box with Git support</li><li>Unzip it somewhere. The executable is eclipse (linux) or eclipse.exe (windows) located in the eclipse/ directory created by the unzip operation</li><li>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.</li></ul><h2>Install Counterclockwise (the Clojure plugin for Eclipse)</h2>(Counterclockwise, CCW for short, is the Clojure plugin for Eclipse)You install it via the “software update center”, that is:<ul><li>Menu Help &gt; Install new software…</li><li>Paste the following Counterclockwise url in the “Work with:” textbox: <a href="http://ccw.cgrand.net/updatesite/">http://ccw.cgrand.net/updatesite/</a> , Hit Enter</li><li>Select counterclockwise, verify the “Contact all update sites during …” chekbox is checked, click next, accept licence, etc., restart Eclipse</li><li>Go to menu Window &gt; Reset Perspective ... this will reset the way the views are layout, and also place correctly the views contributed by Counterclockwise (the Namespace Browser view, placed &quot;behind&quot; the code outline view)</li></ul><h2>Test the install </h2>Create and run a simple Clojure project (&quot;Hello Betty&quot;)<ul><li>Open the Java perspective<ul><li>Window &gt; Open Perspective &gt; Java (a perspective is a predefined layout of views, suitable for a particular type of development)</li></ul></li><li>Create a Clojure project <ul><li>With Leiningen Project Wizard: File &gt; New &gt; Leiningen Project, name it myproject</li><li>The project is created using the &quot;default&quot; Leiningen Template, which creates a Clojure project with a predefined &quot;myproject.core&quot; namespace in src/myproject/core.clj</li></ul></li><li>Add a function definition to myproject.core: <ul><li>Open src/myproject/core.clj, add the following at the end: (defn hello [who] (str &quot;Hello &quot; who &quot; !&quot;)), save the file</li></ul></li><li>Run the project: <ul><li>With file src/myproject/core.clj open, Hit Ctrl+Alt+S (Cmd+Alt+S on MacOS). This sends the whole file's code to the REPL (and also takes care of starting a REPL for the project if none is currently started)</li></ul></li><li>Switch to the REPL in the namespace of your file: <ul><li>Hit Ctrl+Alt+N (Cmd+Alt+N on MacOS). Alternatively, just click on the bottom of the REPL inside the &quot;text input area&quot;</li></ul></li><li>Call your function (Hit Enter to send the expression if the cursor is at the end, or hit Ctrl+Enter / Cmd+Enter if the cursor is not at the end of the text):<table class="wysiwyg-macro" data-macro-name="noformat" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e25vZm9ybWF0fQ&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>&gt; 1:1 helloworld=> (hello "Betty") [Ctrl+Enter]
> "Hello Betty !"
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