Java in Linux

[Rrohit rakesh upadhyay]

I downloaded and extracted "jdk-8u25-linux-x64.tar.gz" in my linux mint 17.1, but when i try to compile a file using "javac" in the command line i get a message like the following:

javac could be present in the following packages

ecj
default-jdk
open-7-jdk

try "sudo apt-get install <package name>" to install the package


It does not state anything about the "jdk-8u25-linux-x64.tar.gz",what should i do about it?


Thank you

[Tim Cooke]

I trust you have read the Oracle JDK 8 and JRE 8 Installation Overview before asking your question here? Perhaps you missed a step?

[Tim Holloway]

Recent Linux distros come with an open-source implementation of Java. That's what apt-get is offering to download and install.

Don't let it. That product isn't fully capable, at least for J2EE. You want to use the Oracle JDK that you downloaded.

To do that, the recommended process is to setup the environment/execution path as follows:

export JAVA_HOME=<location of the Oracle JDK you want to use - for example, /usr/java/jdk-8u25 >
export PATH=$JAVA_HOME/bin:$PATH

Once you do that, the "java -version" command should indicate that you're running the desired java distro.

You can put these lines into your ~/.bash_profile file and they will be executed automatically every time you log in. Assuming you're using bash. Do the equivalent for whatever shell you prefer.

[Rico Felix]

The simplest method is to input the following commands into your shell:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

[Andrew Polansky]

In past I wrote a super simple bash script that I use to install Java on other computers based on Debian/Ubuntu. It works on my Mint perfectly.

Make sure you have extracted jdk-8u25-linux-x64.tar.gz to /usr/local/java/jdk1.8.0_25 and then the run the script below.

#!/bin/bash

#Download and extract java to /usr/local/java before!!

apt-get purge openjdk-\*;

cat >> /etc/profile <<EOF
JAVA_HOME=/usr/local/java/jdk1.8.0_25
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JRE_HOME=/usr/local/java/jdk1.8.0_25/jre
PATH=$PATH:$HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
EOF

update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_25/jre/bin/java" 1;
update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_25/bin/javac" 1; 
update-alternatives --set java /usr/local/java/jdk1.8.0_25/jre/bin/java;
update-alternatives --set javac /usr/local/java/jdk1.8.0_25/bin/javac; 

java -version;

If everything went correctly, you will see something like this at the end of the script's output:

java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)