java launch script for voxelshop

#!/bin/sh

JAVA_GUI_PACKAGES="openjdk-8-jre (Ubuntu), java-1.8.0-openjdk (Fedora)"
if [ ! -f "`command -v java`" ]; then
    xmessage "VoxelShop Error: Java was not found. Install $JAVA_GUI_PACKAGES, or another version of Java with GUI support."
    exit 127  # 127 is for command not found.
fi
logs_dir="$HOME/.var/log/voxelshop"
mkdir -p "$logs_dir"
java -jar /home/owner/.local/lib/voxelshop/voxelshop-start.jar > $logs_dir/last_run.log 2>&1
code=$?
if [ $code -ne 0 ]; then
    date > $logs_dir/last_run.err
    echo "VoxelShop exited with error code $code:" >> $logs_dir/last_run.err

    echo >> $logs_dir/last_run.err
    echo "Ensure you have a java package with GUI support such as:" >> $logs_dir/last_run.err
    echo "$JAVA_GUI_PACKAGES." >> /last_run.err
    echo "The exact error will be shown below" >> $logs_dir/last_run.err
    echo "(ignore incorrect sRGB profile and canberra-gtk-module):" >> $logs_dir/last_run.err

    echo >> $logs_dir/last_run.err
    cat $logs_dir/last_run.log >> $logs_dir/last_run.err
    xmessage -file $logs_dir/last_run.err
fi