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If you updated OSX and find that jEdit no longer starts here’s how to fix it:
Make sure jEdit is not running!
1)control click the jEdit icon and choose “Show Package Contents”
2)In the contents folder you will find a file name Info.plist. Open it in text edit.
3)find the lines
<key>JVMVersion</key>
<string>1.5+</string>

and change them to
<key>JVMVersion</key>
<string>1.6+</string>

jEdit should start now but you may get an error concerning the OSX plugin. If you do go to:
Plugins->Plugin Manager->Manage
in jEdit and remove the OSX plugin everything should now work.

Here’s an update with a much better fix:
open the terminal and run the two following commands:

rm /Applications/jEdit.app/Contents/MacOS/jedit
cp /System/Library/Frameworks/JavaVM.framework/Resources/MacOS/JavaApplicationStub /Applications/jEdit.app/Contents/MacOS/jedit

Fix found here: http://ubergeek.tv/article.php?pid=144

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You may notice that the option key does not work if you are running jEdit on OSX, let’s fix that!

Using jEdit go to /Applications/jEdit.app/Contents/Resources/Java/startup/
and open startup.bsh

In startup.bsh go to line 87 (or around there) and find the line
//Debug.ALT_KEY_PRESSED_DISABLED = false;

change it to
Debug.ALT_KEY_PRESSED_DISABLED = false;

After restarting jEdit the option key should work. Now, you can hold the option key and press the left and right arrows to move quickly between different words.

Hooray!

Here’s the first in a series of jEdit related screencasts for the semester. I’m not much of a voice talent but I suppose practice will make perfect .

Setting Up Code Completion in jEdit

Please comment on this post with a link to your second exercise.