Lets see how to install or update Oracle JDK 7 in semiautomatic way under Linux operating systems, including Ubuntu, Debian and CentOS. Semi is because Oracle has its proprietary license you have to accept before downloading.

Install or Update Oracle JDK 7 in Ubuntu

1. So the first step is to download JDK from Oracle’s site.
2. Create linux executable file ‘oracle_jdk7_install.sh’
3. Put following content on this file. Just copy  & paste
   
   #!/bin/bash INSTALL_DIR=/usr/lib/jvm JDK7_DIR=$INSTALL_DIR/java-7-oracle echo "The script installs Oracle JDK 7 from tar.gz file." if [[ $EUID -ne 0 ]]; then echo "This script must be run as root." exit 1 fi echo "Looking for JDK archive..." LATEST_JDK_ARCHIVE=`ls jdk-7u*-linux-*.tar.gz | sort | tail -1` UPDATE=`echo $LATEST_JDK_ARCHIVE | awk -F '-' '{print $2}' | awk -F '7u' '{print $2}'` if [ -z "$LATEST_JDK_ARCHIVE" ] || [ -z "$UPDATE" ]; then echo "JDK archive wasn't found. It should be in the current directory." exit 1 fi echo "Found archive: $LATEST_JDK_ARCHIVE" echo "Extracting archive..." tar -xzf $LATEST_JDK_ARCHIVE if [ $? -ne 0 ]; then echo "Error while extraction archive." exit 1 fi if [ ! -d jdk1.7.0_$UPDATE ]; then echo "Unexpected archive content." exit 1 fi echo "Moving content to installation directory..." [ ! -e $INSTALL_DIR ] && mkdir -p $INSTALL_DIR [ -e $INSTALL_DIR/jdk1.7.0_$UPDATE ] && rm -r $INSTALL_DIR/jdk1.7.0_$UPDATE/ [ -e $JDK7_DIR ] && rm $JDK7_DIR mv jdk1.7.0_$UPDATE/ $INSTALL_DIR ln -sf $INSTALL_DIR/jdk1.7.0_$UPDATE/ $JDK7_DIR ln -sf $INSTALL_DIR/jdk1.7.0_$UPDATE/ $INSTALL_DIR/default-java echo "Updating alternatives..." # The following part has been taken from script # http://webupd8.googlecode.com/files/update-java-0.5b # and modified to make it work without X-server. gzip -9 $JDK7_DIR/man/man1/*.1 >/dev/null 2>&1 & LATEST=$((`update-alternatives --query java|grep Priority:|awk '{print $2}'|sort -n|tail -1`+1)); if [ -d "$JDK7_DIR/man/man1" ];then for f in $JDK7_DIR/man/man1/*; do name=`basename $f .1.gz`; #some files, like jvisualvm might not be links. Further assume this for corresponding man page if [ ! -f "/usr/bin/$name" -o -L "/usr/bin/$name" ]; then if [ ! -f "$JDK7_DIR/man/man1/$name.1.gz" ]; then name=`basename $f .1`; #handle any legacy uncompressed pages fi update-alternatives --install /usr/bin/$name $name $JDK7_DIR/bin/$name $LATEST \ --slave /usr/share/man/man1/$name.1.gz $name.1.gz $JDK7_DIR/man/man1/$name.1.gz fi done #File links without man pages [ -f $JDK7_DIR/bin/java_vm ] && update-alternatives --install /usr/bin/java_vm \ java_vm $JDK7_DIR/jre/bin/java_vm $LATEST [ -f $JDK7_DIR/bin/jcontrol ] && update-alternatives --install /usr/bin/jcontrol \ jcontrol $JDK7_DIR/bin/jcontrol $LATEST else #no man pages available for f in $JDK7_DIR/bin/*; do name=`basename $f`; #some files, like jvisualvm might not be links if [ ! -f "/usr/bin/$name" -o -L "/usr/bin/$name" ]; then update-alternatives --install /usr/bin/$name $name $JDK7_DIR/bin/$name $LATEST fi done fi echo "Setting up Mozilla plugin..." #File links that apt-get misses [ -f $JDK7_DIR/bin/libnpjp2.so ] && update-alternatives --install \ /usr/lib/mozilla/plugins/libnpjp2.so libnpjp2.so $JDK7_DIR/jre/lib/i386/libnpjp2.so $LATEST echo "Setting up env. variable JAVA_HOME..." cat > /etc/profile.d/java-home.sh << "EOF" export JAVA_HOME="/usr/lib/jvm/java-7-oracle" export PATH="$JAVA_HOME/bin:$PATH" EOF echo "Checking version..." java -version echo "Done."

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   #!/bin/bash INSTALL_DIR=/usr/lib/jvm JDK7_DIR=$INSTALL_DIR/java-7-oracle   echo "The script installs Oracle JDK 7 from tar.gz file."   if [[ $EUID -ne 0 ]]; then    echo "This script must be run as root."    exit 1 fi   echo "Looking for JDK archive..." LATEST_JDK_ARCHIVE=`ls jdk-7u*-linux-*.tar.gz | sort | tail -1` UPDATE=`echo $LATEST_JDK_ARCHIVE | awk -F '-' '{print $2}' | awk -F '7u' '{print $2}'` if [ -z "$LATEST_JDK_ARCHIVE" ] || [ -z "$UPDATE" ]; then     echo "JDK archive wasn't found. It should be in the current directory."     exit 1 fi echo "Found archive: $LATEST_JDK_ARCHIVE"   echo "Extracting archive..." tar -xzf $LATEST_JDK_ARCHIVE if [ $? -ne 0 ]; then     echo "Error while extraction archive."     exit 1 fi if [ ! -d jdk1.7.0_$UPDATE ]; then     echo "Unexpected archive content."     exit 1 fi   echo "Moving content to installation directory..." [ ! -e $INSTALL_DIR ] && mkdir -p $INSTALL_DIR [ -e $INSTALL_DIR/jdk1.7.0_$UPDATE ] && rm -r $INSTALL_DIR/jdk1.7.0_$UPDATE/ [ -e $JDK7_DIR ] && rm $JDK7_DIR mv jdk1.7.0_$UPDATE/ $INSTALL_DIR ln -sf $INSTALL_DIR/jdk1.7.0_$UPDATE/ $JDK7_DIR ln -sf $INSTALL_DIR/jdk1.7.0_$UPDATE/ $INSTALL_DIR/default-java     echo "Updating alternatives..." # The following part has been taken from script # http://webupd8.googlecode.com/files/update-java-0.5b # and modified to make it work without X-server.   gzip -9 $JDK7_DIR/man/man1/*.1 >/dev/null 2>&1 &   LATEST=$((`update-alternatives --query java|grep Priority:|awk '{print $2}'|sort -n|tail -1`+1));   if [ -d "$JDK7_DIR/man/man1" ];then   for f in $JDK7_DIR/man/man1/*; do     name=`basename $f .1.gz`;     #some files, like jvisualvm might not be links. Further assume this for corresponding man page     if [ ! -f "/usr/bin/$name" -o -L "/usr/bin/$name" ]; then         if [ ! -f "$JDK7_DIR/man/man1/$name.1.gz" ]; then         name=`basename $f .1`;          #handle any legacy uncompressed pages       fi       update-alternatives --install /usr/bin/$name $name $JDK7_DIR/bin/$name $LATEST \       --slave /usr/share/man/man1/$name.1.gz $name.1.gz $JDK7_DIR/man/man1/$name.1.gz     fi   done   #File links without man pages   [ -f $JDK7_DIR/bin/java_vm ]  && update-alternatives --install /usr/bin/java_vm \     java_vm  $JDK7_DIR/jre/bin/java_vm $LATEST   [ -f $JDK7_DIR/bin/jcontrol ] && update-alternatives --install /usr/bin/jcontrol \     jcontrol $JDK7_DIR/bin/jcontrol    $LATEST else  #no man pages available   for f in $JDK7_DIR/bin/*; do     name=`basename $f`;     #some files, like jvisualvm might not be links     if [ ! -f "/usr/bin/$name" -o -L "/usr/bin/$name" ]; then       update-alternatives --install /usr/bin/$name $name $JDK7_DIR/bin/$name $LATEST     fi   done fi   echo "Setting up Mozilla plugin..." #File links that apt-get misses [ -f $JDK7_DIR/bin/libnpjp2.so ] && update-alternatives --install \   /usr/lib/mozilla/plugins/libnpjp2.so libnpjp2.so $JDK7_DIR/jre/lib/i386/libnpjp2.so $LATEST   echo "Setting up env. variable JAVA_HOME..." cat > /etc/profile.d/java-home.sh << "EOF" export JAVA_HOME="/usr/lib/jvm/java-7-oracle" export PATH="$JAVA_HOME/bin:$PATH" EOF   echo "Checking version..." java -version echo "Done."

    
4. Run the script as sudoer:
   
   sudo bash oracle-jdk-7-update.sh OR sudo ./oracle_jdk7_install.sh

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   sudo bash oracle-jdk-7-update.sh OR sudo ./oracle_jdk7_install.sh

If in the end of output you see something like

then Oracle JDK 7 was successfully installed.