Installs sun/oracle jdk stuff as alternatives, tested for fedora (14) 64bit (see also http://www.javakaffee.de/blog/2010/12/26/installing-java-on-fedora-using-alternatives/)

setup-jdk-alternatives.sh

#!/bin/sh
#
# Installs sun/oracle jdk stuff as alternatives, tested for fedora (14) 64bit.
# See also http://www.javakaffee.de/blog/2010/12/26/installing-java-on-fedora-using-alternatives/
# Author: martin(dot)grotzke(at)googlemail(dot)com

if [ $# -ne 3 ]; then
        echo 1>&2 "Usage: $0 <major-version> <minor-version> <priority>"
        echo "E.g. $0 1.6.0 2 20000"
        exit 127
fi

MAJOR=$1
MINOR=$2
PRIO=$3
ARCH=`uname -m`

# The standard alternatives...
echo "Installing alternatives for java, javac and jar."
alternatives --install /usr/bin/java java /usr/java/jdk$MAJOR"_"$MINOR/jre/bin/java $PRIO
alternatives --install /usr/bin/javac javac /usr/java/jdk$MAJOR"_"$MINOR/bin/javac $PRIO
alternatives --install /usr/bin/jar jar /usr/java/jdk$MAJOR"_"$MINOR/bin/jar $PRIO

# And perhaps this is also useful
if [ -e /usr/java/jdk$MAJOR"_"$MINOR/jre/lib/amd64/libnpjp2.so ]
then
        echo "Installing alternative for libjavaplugin.so.$ARCH."
        alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.$ARCH /usr/java/jdk$MAJOR"_"$MINOR/jre/lib/amd64/libnpjp2.so $PRIO
else
        echo "/usr/java/jdk$MAJOR"_"$MINOR/jre/lib/amd64/libnpjp2.so does not exist - seems to be another architecture here. Check 32bit stuff."
        echo "Skipping alternative for libjavaplugin.so.$ARCH."
fi

# This is the most important IMHO but kept secret on the web...
echo "Installing alternative for java_sdk_$MAJOR."
alternatives --install /usr/lib/jvm/java-$MAJOR java_sdk_$MAJOR /usr/java/jdk$MAJOR"_"$MINOR $PRIO

if [ -e /etc/profile.d/jdk.sh ]
then
        echo "/etc/profile.d/jdk.sh already exists, won't modify it."
else
        echo "Creating /etc/profile.d/jdk.sh."
        echo "export JAVA_HOME=/usr/lib/jvm/java-$MAJOR" > /etc/profile.d/jdk.sh
        echo 'export PATH=$JAVA_HOME/bin:$PATH' >> /etc/profile.d/jdk.sh
fi

echo "Done."