How to Install Java Jdk 1.6 on Linux
How to install Java JDK on Ubuntu
This tutorial shows you how to install OpenJDK 8, 11, 16, and other JDK builds on Ubuntu 20.
- 1. APT Install JDK (OpenJDK 8 and 11)
- 2. Install JDK manually (OpenJDK 16)
- 3. Install Oracle JDK on Ubuntu
- 4. Switch between different JDK versions
- 5. Add JAVA_HOME to Ubuntu environment variable
- 6. References
1. APT Install JDK (OpenJDK 8 and 11)
This example shows how to use apt install to install the OpenJDK 8 and 11 on Ubuntu.
1.1 We can use sudo apt search openjdk to find all available OpenJDK in the default repository. The below search result show four OpenJDK are available to install.
Terminal
$ sudo apt search openjdk openjdk-11-jdk/focal-updates,focal-security,now 11.0.10+9-0ubuntu1~20.04 amd64 [installed] OpenJDK Development Kit (JDK) openjdk-13-jdk/focal-updates 13.0.4+8-1~20.04 amd64 OpenJDK Development Kit (JDK) openjdk-14-jdk/focal-updates 14.0.2+12-1~20.04 amd64 OpenJDK Development Kit (JDK) openjdk-8-jdk/focal-updates,focal-security 8u282-b08-0ubuntu1~20.04 amd64 OpenJDK Development Kit (JDK) # ... 1.2 If we want to install Java 8.
Terminal
$ sudo apt install openjdk-8-jdk 1.3 If we want to install Java 11.
Terminal
$ sudo apt install openjdk-11-jdk 1.4 Where is JDK installed?
The apt install the Java JDK at this path /usr/lib/jvm.
Terminal
ls -lsa /usr/lib/jvm 4 drwxr-xr-x 5 root root 4096 Mac 29 15:06 . 4 drwxr-xr-x 125 root root 4096 Mac 5 11:51 .. 0 lrwxrwxrwx 1 root root 21 Jul 16 2020 java-1.11.0-openjdk-amd64 -> java-11-openjdk-amd64 4 -rw-r--r-- 1 root root 2044 Jan 20 10:32 .java-1.11.0-openjdk-amd64.jinfo 4 drwxr-xr-x 9 root root 4096 Feb 18 13:54 java-11-openjdk-amd64 0 lrwxrwxrwx 1 root root 20 Jan 20 11:59 java-1.8.0-openjdk-amd64 -> java-8-openjdk-amd64 4 -rw-r--r-- 1 root root 2764 Jan 20 11:59 .java-1.8.0-openjdk-amd64.jinfo 4 drwxr-xr-x 7 root root 4096 Mac 29 15:06 java-8-openjdk-amd64 4 drwxr-xr-x 3 root root 4096 Feb 18 13:53 openjdk-11 1.5 And the global /usr/bin/java is linked to one of the installed JDK.
Terminal
$ which java /usr/bin/java $ ls -lsa /usr/bin/java 0 lrwxrwxrwx 1 root root 22 Sep 14 2020 /usr/bin/java -> /etc/alternatives/java $ ls -lsa /etc/alternatives/java 0 lrwxrwxrwx 1 root root 46 Mac 29 15:15 /etc/alternatives/java -> /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1.6 We can use java -version to verify if Java JDK is installed correctly.
Terminal
$ java -version openjdk version "1.8.0_282" OpenJDK Runtime Environment (build 1.8.0_282-8u282-b08-0ubuntu1~20.04-b08) OpenJDK 64-Bit Server VM (build 25.282-b08, mixed mode) 2. Install JDK manually (OpenJDK 16)
If we want the latest Java JDK, for example JDK 16, early-access builds, or other JDK builds like AdoptOpenJDK, which are not available in the Ubuntu default repository. We can still download the JDK and install it on Ubuntu manually.
This example will install the JDK 16.
2.1 Visit the official OpenJDK 16 page.
2.2 Extracts the downloaded JDK to /opt/jdk-16.
Terminal
$ sudo mkdir /opt/jdk-16 $ sudo tar -zxf ~/Downloads/openjdk-16_linux-x64_bin.tar.gz -C /opt/jdk-16 $ ls -lsa /opt/jdk-16 ls -lsa /opt/jdk-16 total 36 4 drwxr-xr-x 8 root root 4096 Mac 10 13:18 . 4 drwxr-xr-x 5 root root 4096 Mac 15 14:09 .. 4 drwxr-xr-x 2 root root 4096 Mac 10 13:18 bin 4 drwxr-xr-x 5 root root 4096 Mac 10 13:18 conf 4 drwxr-xr-x 3 root root 4096 Mac 10 13:18 include 4 drwxr-xr-x 2 root root 4096 Mac 10 13:18 jmods 4 drwxr-xr-x 69 root root 4096 Mac 10 13:18 legal 4 drwxr-xr-x 5 root root 4096 Mac 10 13:18 lib 4 -rw-r--r-- 1 10668 10668 1133 Feb 8 19:40 release 2.3 This update-alternatives --install /usr/bin/java java let the Ubuntu know there is one more option /opt/jdk-16/bin/java for the /etc/alternatives/java link.
Terminal
$ sudo update-alternatives --install /usr/bin/java java /opt/jdk-16/bin/java 100 2.4 Update the /etc/alternatives/java link.
The below result shows 5 JDK installed on this Ubuntu; choose option 2 for the above extracted JDK 16 /opt/jdk-16/bin/java.
Terminal
$ sudo update-alternatives --config java There are 4 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto mode 1 /opt/jdk-15/bin/java 100 manual mode 2 /opt/jdk-16/bin/java 100 manual mode 3 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode * 4 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode Press <enter> to keep the current choice[*], or type selection number: 2 update-alternatives: using /opt/jdk-16/bin/java to provide /usr/bin/java (java) in manual mode 2.5 Verification.
Terminal
$ java -version openjdk version "16" 2021-03-16 OpenJDK Runtime Environment (build 16+36-2231) OpenJDK 64-Bit Server VM (build 16+36-2231, mixed mode, sharing) 3. Install Oracle JDK on Ubuntu
We need to create an Oracle account to download the Oracle JDK. Please visit the official Oracle JDK link to download the JDK and follow the above install JDK manually, and it works the same.
The Oracle JDK 11 and above are paid products, and you need a license for production use. However, it's still free to download for development and testing.
Install Oracle JDK 11 (Not working now)
Terminal
$ sudo add-apt-repository ppa:linuxuprising/java $ sudo apt update $ sudo apt install oracle-java11-installer Install Oracle JDK 8
Terminal
$ sudo add-apt-repository ppa:webupd8team/java $ sudo apt update $ sudo apt install oracle-java8-installer 4. Switch between different JDK versions
4.1 Review the relationship for /usr/bin/java and /etc/alternatives/java.
Terminal
$ which java /usr/bin/java $ ls -lsa /usr/bin/java 0 lrwxrwxrwx 1 root root 22 Sep 14 2020 /usr/bin/java -> /etc/alternatives/java $ ls -lsa /etc/alternatives/java 0 lrwxrwxrwx 1 root root 46 Mac 29 15:15 /etc/alternatives/java -> /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 4.2 For any new downloaded JDK, run update-alternatives --install /usr/bin/java java to let Ubuntu know there is an extra option for the /usr/bin/java.
4.3 For multiple installed JDK, we can run update-alternatives --config java select which JDK to use.
Terminal
$ sudo update-alternatives --config java There are 4 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto mode 1 /opt/jdk-15/bin/java 100 manual mode * 2 /opt/jdk-16/bin/java 100 manual mode 3 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode 4 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode 5. Add JAVA_HOME to Ubuntu environment variable
Many servers, frameworks, and tools depend on the JAVA_HOME environment variable to find the installed Java. On Ubuntu, we can add the JAVA_HOME to the system-wide environment variables – /etc/environment.
5.1 Open the file /etc/environment with your favorite text editors like vi, vim, or nano.
Terminal
$ sudo vim /etc/environment 5.2 Add JAVA_HOME at a new line and point it to one of the installed JDK.
/etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64/ 5.3 source /etc/environment to reflect the changes in the current session.
Terminal
$ source /etc/environment $ echo $JAVA_HOME /usr/lib/jvm/java-11-openjdk-amd64/ Note
The new changes will disappear if we close the current session or reopen a new terminal because a new shell does not trigger the /etc/environment. Try to restart the Ubuntu or login again; the new changes in /etc/environment will apply automatically.
6. References
- How to check JDK version that installed on your computer
- AdoptOpenJDK Website
- What exactly does update-alternatives do?
- Oracle Java SE Downloads
- Ubuntu – System-wide environment variables
- How to add JAVA_HOME on Ubuntu?
- How to set environment variable on Ubuntu
- How to install Java JDK on macOS
Comments
How to Install Java Jdk 1.6 on Linux
Source: https://mkyong.com/java/how-to-install-java-jdk-on-ubuntu-linux/