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**OneLine** · Feb 04, 2012, 01:30 PM

Example

With the Kubuntu 12.04 (alpha2), i386.

Browsing to the http://www.oracle.com/technetwork/ja...ads/index.html .

Picking the Java SE 6 Update 30 & Java SE 7u2, JRE.

You must accept the Oracle Binary Code License Agreement for Java SE to download this software.

Accepting...

Thank you for accepting the Oracle Binary Code License Agreement for Java SE; you may now download this software.

Picking the right poison: jre-6u30-linux-i586.bin & jre-7u2-linux-i586.tar.gz.

The bin is a self extracting archive. It need to marked as an executable. Right click with the file manager > Properties > Permissions > is executable.

Executing it with the command:

Code:

./jre-6u30-linux-i586.bin

Log of ./jre-6u30-linux-i586.bin
Sat Feb 4 14:50:57 2012

Unpacking...
Checksumming...
Extracting...
UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu).
creating: jre1.6.0_30/
creating: jre1.6.0_30/bin/
inflating: jre1.6.0_30/bin/java
...
Creating jre1.6.0_30/lib/plugin.jar
Creating jre1.6.0_30/lib/javaws.jar
Creating jre1.6.0_30/lib/deploy.jar

Done.

There is the folder: jre1.6.0_30.

The jre-7u2-linux-i586.tar.gz is a tar archive and can be extracted from the file manager. Right click it > Extract > Extract Archive Here, Autodetect Subfolder.

There is folder: jre1.7.0_02.

Renaming the folders:

jre1.6.0_30 -> java-6-oraclejre
jre1.7.0_02 -> java-7-oraclejre

Moving them to the /usr/lib/jvm/ (kdesudo dolphin).

**OneLine** · Feb 04, 2012, 01:51 PM

Alternatives

man update-alternatives:

NAME
update-alternatives - maintain symbolic links determining default commands

SYNOPSIS
update-alternatives [option...] command

DESCRIPTION
update-alternatives creates, removes, maintains and displays information about the symbolic links comprising the Debian alternatives system.

It is possible for several programs fulfilling the same or similar functions to be installed on a single system at the same time...

Adding

Adding the Oracle javas to the alternative system:

Java 6 -

Code:

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-6-oraclejre/bin/java 20

Java 7 -

Code:

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-7-oraclejre/bin/java 20

There are:

Code:

update-alternatives --list java

/usr/lib/jvm/java-6-openjdk-i386/jre/bin/java
/usr/lib/jvm/java-6-oraclejre/bin/java
/usr/lib/jvm/java-7-oraclejre/bin/java

KDE System Settings module: kalternatives

Description-en: graphical alternatives system configuration tool
Kalternatives offers a GUI to configure the alternative systems (a
system that allows you to select one alternative file for many in the
filesystem).
Kalternatives is available as KDE configuration module, integrated by default
into KDE's System Settings.
.
This is an advanced GUI of the update-alternatives program shipped with dpkg.

With the default, OpenJDK:

Code:

java -version

java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11) (6b24-1.11-0ubuntu1)
OpenJDK Client VM (build 20.0-b12, mixed mode, sharing)

Turning the Oracle Java-6 on:

Code:

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-6-openjdk-i386/jre/bin/java 1061 auto mode
1 /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java 1061 manual mode
2 /usr/lib/jvm/java-6-oraclejre/bin/java 20 manual mode
3 /usr/lib/jvm/java-7-oraclejre/bin/java 20 manual mode

Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/java-6-oraclejre/bin/java to provide /usr/bin/java (java) in manual mode.

The Java is telling:

Code:

java -version

java version "1.6.0_30"
Java(TM) SE Runtime Environment (build 1.6.0_30-b12)
Java HotSpot(TM) Client VM (build 20.5-b03, mixed mode, sharing)

Turning the Oracle Java-7 on:

Code:

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-6-openjdk-i386/jre/bin/java 1061 auto mode
1 /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java 1061 manual mode
* 2 /usr/lib/jvm/java-6-oraclejre/bin/java 20 manual mode
3 /usr/lib/jvm/java-7-oraclejre/bin/java 20 manual mode

Press enter to keep the current choice[*], or type selection number: 3
update-alternatives: using /usr/lib/jvm/java-7-oraclejre/bin/java to provide /usr/bin/java (java) in manual mode.

The Java is telling:

Code:

java -version

java version "1.7.0_02"
Java(TM) SE Runtime Environment (build 1.7.0_02-b13)
Java HotSpot(TM) Client VM (build 22.0-b10, mixed mode)

Removal

Removing the Oracle Java 6 from the alternatives:

Code:

sudo update-alternatives --remove java /usr/lib/jvm/java-6-oraclejre/bin/java

and there are available:

Code:

update-alternatives --list java

/usr/lib/jvm/java-6-openjdk-i386/jre/bin/java
/usr/lib/jvm/java-7-oraclejre/bin/java

The installed Java 6, /usr/lib/jvm/java-6-oraclejre/, can be removed.

**OneLine** · Feb 04, 2012, 02:07 PM

Browser java plugin

Using the Opera.

Opera: http://www.opera.com/docs/linux/plugins/install/
Oracle: http://www.oracle.com/technetwork/ja...ux-136395.html

Locating the Oracle Java plugin:

Code:

locate libnpjp2.so

/usr/lib/jvm/java-6-oraclejre/lib/i386/libnpjp2.so
/usr/lib/jvm/java-7-oraclejre/lib/i386/libnpjp2.so

Opening the file manager (kdesudo dolphin) to the /usr/lib/opera/plugins/ & /usr/lib/jvm/java-7-oraclejre/lib/i386/. Drag&dropping&linking the libnpjp2.so plugin to the /usr/lib/opera/plugins/.

Starting the Opera and testing the Java on http://java.com/en/download/testjava.jsp.

Seems to work.

Note !

I changed the libnpjp2.so plugin status to executable. It was not, when extracted from the jre-7u2-linux-i586.tar.gz.

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