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Topic: How To Install Java On Ubuntu 16.04 Box |
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| How To Install Java On Ubuntu 16.04 Box |
Java and the JVM (Java's virtual machine) are widely used and required for many kinds of software. This thread is to instruct you to install and manage different versions of Java on Ubuntu 16.04 box.
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| Install the Default JDK |
$ sudo apt-get update
$ sudo apt-get install default-jdk
Where does it locate?
$ which java
/usr/bin/java
Which version is installed?
$ java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-2ubuntu1.16.04.3-b11)
OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)
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| Install the Oracle JDK |
First, add Oracle's PPA, then update your package repository
$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
Then specify the version you want to install
JDK 8
$ sudo apt-get install oracle-java8-installer
or JDK 9
$ sudo apt-get install oracle-java9-installer
http://download.oracle.com/otn-pub/java/jdk/8u144-b01/090f390dda5b47b9b721c7dfaa008135/
jdk-8u144-linux-x64.tar.gz?AuthParam=1508369709_cd8d89c9ea21969593c7114b6684b14b
Connecting to download.oracle.com (download.oracle.com)|23.72.38.162|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2017-10-18 16:33:09 ERROR 404: Not Found.
download failed
Oracle JDK 8 is NOT installed.
dpkg: error processing package oracle-java8-installer (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
oracle-java8-installer
E: Sub-process /usr/bin/dpkg returned an error code (1)
That's not right which means the auto process (apt-get install) is broken. We have to go the manual way.
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| Manually Install Oracle JDK |
Step 1) Download the Oracle JDK package
There are two packages available for Linux: .rpm and .gz. Here, .gz is taken as example.
Download a JDK from http://download.java.net/. Look for ".gz" under "Linux" and download to local Windows machine.
Step 2). Make the folder available
$ sudo mkdir /usr/local/java
$ cd /usr/local/
$ sudo chmod 777 java
Step 3). Upload the downloaded JDK by WinSCP
Copy jdk-8u152-linux-x64.tar.gz onto /usr/local/java/
Step 4). Unzip the package
$ tar xzf jdk-8u152-linux-x64.tar.gz
The JDK content is under folder jdk1.8.0_152
Step 5). Install JDK Linkage
Format:
$ update-alternatives --install <link> <name> <path> <priority>
$ sudo update-alternatives --install /usr/bin/java java /usr/local/java/jdk1.8.0_152/bin/java 100
$ sudo update-alternatives --install /usr/bin/jar jar /usr/local/java/jdk1.8.0_152/bin/jar 100
$ sudo update-alternatives --install /usr/bin/javac javac /usr/local/java/jdk1.8.0_152/bin/javac 100
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| Manage Different Versions of Java |
Now the Ubuntu box has at least two versions of Java: the default openJDK & Oracle JDK. Here is how to manage what is to be used.
$ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 auto mode
1 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode
2 /usr/local/java/jdk1.8.0_152/bin/java 100 manual mode
Press <enter> to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/local/java/jdk1.8.0_152/bin/java to provide /usr/bin/java (java) in manual mode
Here we chose Oracle JDK1.8 and linked it to /usr/bin/java
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| Set the JAVA_HOME Environment Variable |
Many java applications need to know where to load the JDK based on environment parameter JAVA_HOME
We can set it inside file /etc/environment:
$ sudo nano /etc/environment
Add at the end of file with this line:
JAVA_HOME="/usr/local/java/jdk1.8.0_152"
Save and exit the file, and reload it (or logout and login):
$ source /etc/environment
You can now verify it:
$ echo &JAVA_HOME
/usr/local/java/jdk1.8.0_152
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posted on: 10/20/2017 12:06:47 AM
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