Shell script preamble to make a executable JAR self invocable

gistfile1.sh

#!/bin/sh
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

MYSELF=`which "$0" 2>/dev/null`
[ $? -gt 0 -a -f "$0" ] && MYSELF="./$0"

#
# Cleanup paths for Cygwin.
#
case "`uname`" in
CYGWIN*)
	MYSELF=`cygpath --windows --mixed --path "$MYSELF"`
	;;
Darwin)
	if test -e /System/Library/Frameworks/JavaVM.framework
	then
		java_args='
			-Dcom.apple.mrj.application.apple.menu.about.name=CloudGem
			-Dcom.apple.mrj.application.growbox.intrudes=false
			-Dapple.laf.useScreenMenuBar=true
			-Xdock:name=CloudGem
		'
	fi
	;;
esac

java=java
if test -n "$JAVA_HOME"
then
	java="$JAVA_HOME/bin/java"
fi

exec "$java" $java_args -jar $MYSELF "$@"
exit 1