hi
i have just installed fedora 21,I have installed oracle jdk8 from its rpm pakage with no failure but when i type alternatives --config java i just see one choice which is openjdk, i tried to install oracle jdk pakage again but it says
package jdk1.8.0_20-2000:1.8.0_20-fcs.x86_64 is already installed
To extend on @vtrfny 's answer here is my ultimate guide on how to install Oracle JDK 8 once for all.
Download Oracle JDK from here and install using following command.
Install
rpm -ivh jdk-<version>-linux-x64.rpm
Upgrade
rpm -Uvh jdk-<version>-linux-x64.rpm
This will install Oracle JDK 8 in
/usr/java/jdk<version>.
Choose Alternatives
Config
alternatives --config java
alternatives --config javac
alternatives --config javaws
Verify
$ alternatives --list | grep /usr/java
javaws manual /usr/java/jdk1.8.0_74/bin/javaws
javac manual /usr/java/jdk1.8.0_74/bin/javac
java manual /usr/java/jdk1.8.0_74/jre/bin/java
Verify Installation
$ java -version
java version "1.8.0_74"
Java(TM) SE Runtime Environment (build 1.8.0_74-b02)
Java HotSpot(TM) 64-Bit Server VM (build 25.74-b02, mixed mode)
$ javac -version
javac 1.8.0_74
Information below is no longer required.
Starting with version 8u40, the JDK installation is integrated with the alternatives framework and after installation, the alternatives framework is updated to reflect the binaries from the recently installed JDK. Java commands such as java, javac, javadoc, and javap can be invoked from the command line. Source - Oracle JDK Installation Instructions
Setup Alternatives
su -
alternatives --install /usr/bin/java java /usr/java/default/jre/bin/java 200000
alternatives --install /usr/bin/javaws javaws /usr/java/default/jre/bin/javaws 200000
alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86_64 /usr/java/default/jre/lib/amd64/libnpjp2.so 200000
alternatives --install /usr/bin/javac javac /usr/java/default/bin/javac 200000
alternatives --install /usr/bin/jar jar /usr/java/default/bin/jar 200000
Choose Alternatives
su -
alternatives --config java
alternatives --config javaws
alternatives --config libjavaplugin.so.x86_64
alternatives --config javac
alternatives --config jar
Errors
failed to read link /usr/bin/javaws: No such file or directory`
For solution see this blogpost.
You need to add it to list of alternatives first:
alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_25/jre/bin/java 200000
Download Oracle JDK from here and install using following command:
rpm -ivh jdk-<version>-linux-x64.rpm
rpm -Uvh jdk-<version>-linux-x64.rpm
This will install Oracle JDK /usr/java/jdk<version>.
java -version javac
alternatives --config java alternatives --config javac
Note: java with [+] is currently on use
Note : Java and Firefox Browser * https://www.java.com/en/download/faq/...
For configuring alternatives, I follow a slightly different approach to @donniezazen's steps.
Below approach is useful for me as I frequently use other components during Java development.
sudo /usr/sbin/alternatives \
--install /usr/bin/java java /usr/java/jdk1.8.0_45/bin/java 20000 \
--slave /usr/lib/jvm/java_home_dir java_home_dir /usr/java/jdk1.8.0_45 \
--slave /usr/bin/javadoc javadoc /usr/java/jdk1.8.0_45/bin/javadoc \
--slave /usr/bin/javaws javaws /usr/java/jdk1.8.0_45/bin/javaws \
--slave ... add those you need ... keytool / orbd / servertool / rmiregistry ... etc
Full alternatives command is here
Also configure such that JAVA_HOME is switched each time alternatives is used.
sudo vim /etc/profile.d/sun-jdk.sh
# /etc/profile.d/sun-jdk.sh
#
# Set PATH for Sun JDK
export JAVA_HOME=`realpath /etc/alternatives/java_home_dir`
PATH=$JAVA_HOME/bin:$PATH
export PATH
Don't forget to make the script executable
sudo chmod +x /etc/profile.d/sun-jdk.sh
@cheesiechimp I don't really understand master slave thing of alternatives. I like the idea of switching alternatives. I will look into it. Thanks.
Asked: 2014-12-12 00:28:53 -0500
Seen: 59,244 times
Last updated: Nov 17 '18
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