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First, add the PPA:
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add-apt-repository ppa:webupd8team/java |
Then update the software information:
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apt-get update |
Then install Java (replace 8 with another Java version you might want instead, like 6 or 7):
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apt-get install oracle-java8-installer |
The installer takes a while since it needs to download the latest Java installer from the Oracle site.
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| SettingJavaEnvironmentVariables |
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Setting Java ...
Environment Variables
To automatically set up the Java 8 environment variables, you can install the following package:
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sudo apt-get install oracle-java8-set-default |
Below /etc/profile.d there are two files jdk.csh sh and jdk.sh csh who contain the environment variables definitions, here .
Here is the content of jdk.sh:
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export J2SDKDIR=/usr/lib/jvm/default-java-8-oracle
export J2REDIR=/usr/lib/jvm/default-java-8-oracle/jre
export PATH=$PATH:/usr/lib/jvm/default-java-8-oracle/bin:/usr/lib/jvm/default-java-8-oracle/db/bin:/usr/lib/jvm/default-java-8-oracle/jre/bin
export JAVA_HOME=/usr/lib/jvm/default-java-8-oracle
export DERBY_HOME=/usr/lib/jvm/default-java/db |
Here is the content of jdk.csh:
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setenv J2SDKDIR /usr/lib/jvm/default-java-8-oracle
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
setenv JAVA_HOME /usr/lib/jvm/default-java
setenv DERBY_HOME /usr/lib/jvm/default-java/db |
Verification
Make sure something silly didn't happen and your alternatives were set to Oracle Java:
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java -version |
Expected output (with Oracle Java 8):
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java version "1.8.0_40"
Java(TM) SE Runtime Environment (build 1.8.0_40-b25)
Java HotSpot(TM) Server VM (build 25.40-b25, mixed mode) |
Wrong output (with OpenJRE)
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OpenJDK Runtime Environment (IcedTea6 1.13.6) (6b34-1.13.6-1ubuntu0.12.04.1)
OpenJDK Server VM (build 23.25-b01, mixed mode) |
Then
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javac -version |
Expected output (with Oracle Java 8):
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javac 1.8.0_40 |
(Without Oracle Java, OpenJDK is rarely installed)
If the wrong Java is chosen, run:
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update-alternatives --config java
update-alternatives --config javac
update-alternatives --config javaws |
and choose Oracle's needed version.
Then run
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update-initramfs -u |
Troubleshooting
...
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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| title | /etc/apt/apt.conf.d/03java-bypass |
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Acquire::http::Proxy {
download.oracle.com DIRECT;
}; |
...