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sudo add-apt-repository ppa:webupd8team/java
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
sudo apt-get update
sudo apt-get install oracle-java8-installer

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export J2SDKDIR=/usr/lib/jvm/default-java
export J2REDIR=/usr/lib/jvm/default-java/jre
export PATH=$PATH:/usr/lib/jvm/default-java/bin:/usr/lib/jvm/default-java/db/bin:/usr/lib/jvm/default-java/jre/bin:$PATH
export JAVA_HOME=/usr/lib/jvm/default-java
export DERBY_HOME=/usr/lib/jvm/default-java/db

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setenv J2SDKDIR /usr/lib/jvm/default-java
setenv J2REDIR /usr/lib/jvm/default-java/jre
setenv PATH ${PATH}:/usr/lib/jvm/default-java/bin:/usr/lib/jvm/default-java/db/bin:/usr/lib/jvm/default-java/jre/bin:${PATH}
setenv JAVA_HOME /usr/lib/jvm/default-java
setenv DERBY_HOME /usr/lib/jvm/default-java/db

The oracle-java8-set-default package install only those two files.

The system will ensure that one those files will be runned when you open a session.

However the Java Environment variables collapse with the /usr/bin and /etc/alternatives system.

if we run the java command the PATH is resolved it against /usr/bin. The default jdk.sh or jdk.csh add the path paths to solve the java command commands, tools or libraries while it is already resolved though the standard update-alternative mechanism.

Beyond that it is pretty common to use the JAVA_HOME, the OpenJDK could need it as weelwell. Not sure who is using the J2SDKDIR and J2REDIR environment variables but we keep it for integrity.

Further more Derby is delivered with the Oracle JDK but not with the OpenJDK. It sounds to us that gathering the Java environment variables in a single place is a good practice.

Here the is a patched jdk.sh and jdsk.csh we use . Basically who improve the PATH strategy, we favored the /usr/bin and /etc/alternatives style and narrow the PATH strategy. Basically we remove the extra path information paths and kept the derby path.

Here is the content of of our patched jdk.sh:

export J2SDKDIR=/usr/lib/jvm/default-java
export J2REDIR=/usr/lib/jvm/default-java/jre
export PATH=$PATH:/usr/lib/jvm/default-java/db/bin
export JAVA_HOME=/usr/lib/jvm/default-java
export DERBY_HOME=/usr/lib/jvm/default-java/db

Here is the content of of our patched jdk.csh:

setenv J2SDKDIR /usr/lib/jvm/default-java
setenv J2REDIR /usr/lib/jvm/default-java/jre
setenv PATH ${PATH}:/usr/lib/jvm/default-java/db/bin
setenv JAVA_HOME /usr/lib/jvm/default-java
setenv DERBY_HOME /usr/lib/jvm/default-java/db

Close and re-open a session and check your environment with a printenv command.

Then runNot sure if we need to run this command, however for historical reasons we keep it.

update-initramfs -u

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The installer fetches the latest Java binary via wget.

Most of the time, the download fails because either the firewall blocks it or because the cacher doesn't allow it.

Since Java updates are not very frequent, we can turn off the firewall while installing, but the cacher can at least be configured for a permanent bypass.

Create /etc/apt/apt.conf.d/03java-bypass with the following contents:

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This will ensure that downloads from download.oracle.com initiated by pre/post-install scripts do not go through the cacher.

The ideal solution would be to make them cached but that needs a regex hack for apt-cacher-ng (to stop it from rejecting this site as a cacheable source) which I was not able to develop yet.

A workaround has been found for this problem:

According to this http://askubuntu.com/a/503992

One can add the following pattern in the acng.conf file.

PfilePattern = .*(\.d?deb|\.rpm|\.drpm|\.dsc|\.tar(\.gz|\.bz2|\.lzma|\.xz)(\.gpg|\?AuthParam=.*)?|\.diff(\.gz|\.bz2|\.lzma|\.xz)|\.jigdo|\.template|changelog|copyright|\.udeb|\.debdelta|\.diff/.*\.gz|(Devel)?ReleaseAnnouncement(\?.*)?|[a-f0-9]+-(susedata|updateinfo|primary|deltainfo).xml.gz|fonts/(final/)?[a-z]+32.exe(\?download.*)?|/dists/.*/installer-[^/]+/[0-9][^/]+/images/.*)$

However the trick is to help acng to send a HTTP cookie with each and every request so the following pattern is also necessary in acng.conf:

RequestAppendix: Cookie: oraclelicense=a

Auto accept license

echo oracle-java9-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections

or

echo oracle-java8-installer shared/accepted-oracle-licence-v1-1 boolean true | sudo /usr/bin/debconf-set-selections

Architecture

If your host architecture differs from LTSP chroot, you won't be able to install Java this way. Chrooting will make the chroot report the host's architecture to the installer, which causes it to download the wrong binary. Generally, chroots should be kept the same architecture as host, but if they must be different, one can still install Java this way if live-boot from the correct architecture media is done and chroot is entered from it.

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Plugin

In some cases, the presence of IcedTea Java Browser plugin (OpenJRE implementation) will prevent Oracle Java plugin from working or even being installed.

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Note: Oracle Java will not work in Google Chrome (since Google changed the plugin implementation system from previous standard) until Oracle issues an updated plugin.

As we see in the the Java Environment Tutorial the .jinfo file is able to register the plugin support. However we do not use this mechanism.

This tutorial only use the Oracle Firefox Java support while Chrome and Chromium do not any more support.

Rather than using the jinfo file to register the plugin support we use the symobic link technics. Do you not forget to update it when upgrading.

In the jinfo file we introduced in the Java Environment Tutorial there are some plugin support described:

#plugin xulrunner-1.9-javaplugin.so /usr/lib/jvm/java-8-oracle/jre/lib/i386/libnpjp2.so
plugin firefox-javaplugin.so /usr/lib/jvm/java-8-oracle/jre/lib/i386/libnpjp2.so
#plugin iceape-javaplugin.so /usr/lib/jvm/java-8-oracle/jre/lib/i386/libnpjp2.so
#plugin iceweasel-javaplugin.so /usr/lib/jvm/java-8-oracle/jre/lib/i386/libnpjp2.so
#plugin mozilla-javaplugin.so /usr/lib/jvm/java-8-oracle/jre/lib/i386/libnpjp2.so
#plugin midbrowser-javaplugin.so /usr/lib/jvm/java-8-oracle/jre/lib/i386/libnpjp2.so
#plugin xulrunner-javaplugin.so /usr/lib/jvm/java-8-oracle/jre/lib/i386/libnpjp2.so

Only the Firefox Java plugin support is in use.

In the update-alternatives we Install only the Firefox Java plugin :

#sudo update-alternatives --install /usr/lib/xulrunner-addons/plugins/libjavaplugin.so xulrunner-1.9-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so 1073;
sudo update-alternatives --install /usr/lib/firefox-addons/plugins/firefox-javaplugin.so firefox-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so 1073;
#sudo update-alternatives --install /usr/lib/iceape/plugins/iceape-javaplugin.so iceape-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so 1073;
#sudo update-alternatives --install /usr/lib/iceweasel/plugins/iceweasel-javaplugin.so iceweasel-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so 1073;
#sudo update-alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so mozilla-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so 1073;
#sudo update-alternatives --install /usr/lib/midbrowser/plugins/midbrowser-javaplugin.so midbrowser-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so 1073;
#sudo update-alternatives --install /usr/lib/xulrunner-addons/plugins/libjavaplugin.so xulrunner-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so 1073;

Once you have installed the Firefox Java plugin support you should see the following link:

sudo mkdiruser@machine:/usr/lib/firefox-addons/plugins$ ls -pal /usr/lib/firefox-addons/plugins
cd/
total 8
drwxr-xr-x 2 root root 4096 Jul 13 10:26 .
drwxr-xr-x 6 root root 4096 Aug 18 2012 ..
lrwxrwxrwx 1 root root 39 Jul 13 10:26 firefox-javaplugin.so -> /etc/alternatives/firefox-javaplugin.so

Then test your Firefox configuration with Test Java.

In the update-alternatives we Remove only the Firefox Java plugin :

#sudo update-alternatives --remove xulrunner-1.9-javaplugin.so /usr/lib/jvm/firefox-addons/plugins
sudo ln -s default-java/jre/lib/i386/libnpjp2.so;
sudo update-alternatives --remove firefox-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so;
#sudo update-alternatives --remove iceape-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so;
#sudo update-alternatives --remove iceweasel-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so;
#sudo update-alternatives --remove mozilla-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so;
#sudo update-alternatives --remove midbrowser-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so;
#sudo update-alternatives --remove xulrunner-javaplugin.so /usr/lib/jvm/default-java/jre/lib/i386/libnpjp2.so

Then test your Firefox configuration with Test Java.

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Once you have removed the Firefox Java plugin support no more symlink should exist:

user@machine:/usr/lib/jvm/tools$ ls -al /usr/lib/firefox-addons/plugins/
total 8
drwxr-xr-x 2 root root 4096 Jul 13 11:07 .
drwxr-xr-x 6 root root 4096 Aug 18  2012 ..

Reference

http://www.webupd8.org/2015/02/install-oracle-java-9-in-ubuntu-linux.html