Install Java JDK
The manual way
Download
the 32-bit or 64-bit Linux "compressed binary file" -
it has a ".tar.gz" file extension.
Uncompress it
tar -xvf
jdk-8-linux-i586.tar.gz (32-bit)
tar -xvf
jdk-8-linux-x64.tar.gz (64-bit)
The JDK 8 package is extracted
into ./jdk1.8.0 directory. N.B.:
Check carefully this folder name since Oracle seem to change this
occasionally with each update.
Now move the JDK 8 directory
to /usr/lib
sudo mkdir -p /usr/lib/jvm
sudo mv
./jdk1.8.0 /usr/lib/jvm/
Now run
sudo update-alternatives --install
"/usr/bin/java" "java"
"/usr/lib/jvm/jdk1.8.0/bin/java" 1
sudo update-alternatives --install
"/usr/bin/javac" "javac"
"/usr/lib/jvm/jdk1.8.0/bin/javac" 1
sudo
update-alternatives --install "/usr/bin/javaws"
"javaws" "/usr/lib/jvm/jdk1.8.0/bin/javaws" 1
This will assign Oracle JDK a
priority of 1, which means that installing other JDKs will
replace it as the
default. Be sure to use a higher priority if you want Oracle
JDK to remain the default.
Correct the file ownership
and the permissions of the executables:
sudo chmod a+x /usr/bin/java
sudo chmod a+x /usr/bin/javac
sudo chmod a+x /usr/bin/javaws
sudo chown -R
root:root /usr/lib/jvm/jdk1.8.0
N.B.: Remember - Java JDK has
many more executables that you can similarly install as above.
java, javac,
javaws are probably the most
frequently required. This answer
lists the other executables available.
Run
sudo
update-alternatives --config java
You will see output similar to
the one below - choose the number of jdk1.8.0 - for example 3
in this list (unless you have have never installed Java installed
in your computer in which case a sentence saying "There is
nothing to configure" will appear):
$ sudo
update-alternatives --config java
There are 3 choices
for the alternative java (providing /usr/bin/java).
Selection
Path Priority
Status
------------------------------------------------------------
0
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071
auto mode
1
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071
manual mode
* 2
/usr/lib/jvm/jdk1.7.0/bin/java 1 manual
mode
3
/usr/lib/jvm/jdk1.8.0/bin/java 1
manual mode
Press enter to keep
the current choice[*], or type selection number: 3
update-alternatives:
using /usr/lib/jvm/jdk1.8.0/bin/java to provide /usr/bin/java
(java) in manual mode
Repeat the above for:
sudo
update-alternatives --config javac
sudo
update-alternatives --config javaws
Note for NetBeans users!
If you want to enable the Mozilla
Firefox plugin:
32 bit:
ln -s
/usr/lib/jvm/jdk1.8.0/jre/lib/i386/libnpjp2.so ~/.mozilla/plugins/
64 bit:
ln
-s /usr/lib/jvm/jdk1.8.0/jre/lib/amd64/libnpjp2.so
~/.mozilla/plugins/
N.B.: You can link the plugin
(libnpjp2.so) to
/usr/lib/firefox/plugins/ for a
system-wide installation (/usr/lib/firefox-addons/plugins
from 15.04 onwards). For Ubuntu 13.10, the path to the plugin
directory is /usr/lib/firefox/browser/plugins/.
Depending on your configuration,
you might need to update the apparmor profile for Firefox (or
other browsers) in
/etc/apparmor.d/abstractions/ubuntu-browsers.d/java:
# Replace the two
lines:
#
/usr/lib/jvm/java-*-sun-1.*/jre/bin/java{,_vm} cx ->
browser_java,
#
/usr/lib/jvm/java-*-sun-1.*/jre/lib/*/libnp*.so cx ->
browser_java,
# with those (or adapt
to your new jdk folder name)
/usr/lib/jvm/jdk*/jre/bin/java{,_vm}
cx -> browser_java,
/usr/lib/jvm/jdk*/jre/lib/*/libnp*.so
cx -> browser_java,
Then restart apparmor:
sudo
/etc/init.d/apparmor restart
The easy way
The easiest way to install the JDK
7 is to do it with the Web Up8 Oracle Java OOS. However, it is
believed that this PPA is sometimes out of date. Also note the
dangers of using a PPA.
This installs JDK 7 (which
includes Java JDK, JRE and the Java browser plugin):
sudo apt-get install
python-software-properties
sudo add-apt-repository
ppa:webupd8team/java
sudo apt-get update
sudo apt-get install
oracle-java7-installer
# or if you want JDK 8:
# sudo apt-get install
oracle-java8-installer
# these commands
install Oracle JDK7/8 and set them as default VMs automatically:
# sudo apt-get install
oracle-java7-set-default
#
sudo apt-get install oracle-java8-set-default
N.B.: Before someone screams this
is against the Oracle redistribution license - the PPA does
not actually have Java in the personal repository. Instead, the
PPA directly downloads from Oracle and installs it.
The Script way
If you're on a fresh installation
of Ubuntu with no previous Java installations, this script
automates the process outlined above if you don't want to type all
that into a console. Remember, you still need to download
Java from Oracle's website -- Oracle's links are not wget
friendly.
Before using this make
sure that this script is in the same directory as the
.tar.gz file extension that you
downloaded and there are no files that start with
jdk-7 in the same folder. If there are, please move them out of
the folder temporarily. Remember to make the script executable
(chmod +x <script's file>).
#!/bin/sh
tar -xvf jdk-7*
sudo mkdir /usr/lib/jvm
sudo mv ./jdk1.7*
/usr/lib/jvm/jdk1.7.0
sudo
update-alternatives --install "/usr/bin/java" "java"
"/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo
update-alternatives --install "/usr/bin/javac" "javac"
"/usr/lib/jvm/jdk1.7.0/bin/javac" 1
sudo
update-alternatives --install "/usr/bin/javaws" "javaws"
"/usr/lib/jvm/jdk1.7.0/bin/javaws" 1
sudo chmod a+x
/usr/bin/java
sudo chmod a+x
/usr/bin/javac
sudo
chmod a+x /usr/bin/javaws
If you want to install the plugin
for Firefox then add this to the end of the script:
mkdir
~/.mozilla/plugins
ln -s
/usr/lib/jvm/jdk1.7.0/jre/lib/amd64/libnpjp2.so
~/.mozilla/plugins/
sudo
/etc/init.d/apparmor restart
Check if installation was successful
You can check if the installation
succeeded with the following command:
java
-version
You should see something like
java version "1.8.0"
Java(TM) SE Runtime
Environment (build 1.8.0-b132)
Java
HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)
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