Description:

Jedit opens multiple instances instead of reusing active instance. This could be prevented by adding the -reuseview option before the "@" symbol in the final line of the file /usr/bin/jedit

Also by adding the -background option, Jedit would open more quickly if opened more than once in a session.

So the final lines of the script would look like this:

# Launch application.

exec "$JAVA_HOME/bin/java" -Xmx${JAVA_HEAP_MAX_SIZE}M -jar "/usr/share/java/jedit/jedit.jar" -background -reuseview "$@"

Additional info:
* package version jedit-4.4.2-1

Source of changes:
I found the options used here when modifying my version:
http://weblog.scanyours.com/2011/01/17/howto-prevent-multiple-instances-of-jedit/

regards,
Richard