Java 8 and Netbeans

Java8netbeans.org

Java

Assumptions

This write-up assumes Ubuntu 18.04 or similar, with OpenJDK installed

links

jacek@jacek-ixtreme-M5850:~/Desktop$ ls -al /usr/bin/java
lrwxrwxrwx 1 root root 22 Jul  9 20:09 /usr/bin/java -> /etc/alternatives/java

jacek@jacek-ixtreme-M5850:~/Desktop$ ls -al /etc/alternatives/java
lrwxrwxrwx 1 root root 43 Jul  9 20:09 /etc/alternatives/java -> /usr/lib/jvm/java-11-openjdk-amd64/bin/java

Install Oracle java

Inspired by the following but without using PPA. https://medium.com/coderscorner/installing-oracle-java-8-in-ubuntu-16-10-845507b13343

select java 8 version and download it

https://www.oracle.com/technetwork/java/javase/downloads/index.html

That will result in a file like this ~/Downloads/jdk-8u181-linux-x64.tar.gz

copy and decompress java

jacek@jacek-ixtreme-M5850:~/Desktop$ cd /usr/lib/jvm/

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ sudo cp ~/Downloads/jdk-8u181-linux-x64.tar.gz .

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ ls
default-java               java-11-openjdk-amd64
java-1.11.0-openjdk-amd64  jdk-8u181-linux-x64.tar.gz

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ sudo tar -xvzf ./jdk-8u181-linux-x64.tar.gz

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ ls
default-java               java-11-openjdk-amd64  jdk-8u181-linux-x64.tar.gz
java-1.11.0-openjdk-amd64  jdk1.8.0_181

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ sudo rm ./jdk-8u181-linux-x64.tar.gz

Use alternatives with new java

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.8.0_181/bin/java 2

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ sudo update-alternatives  --list java
/usr/lib/jvm/java-11-openjdk-amd64/bin/java
/usr/lib/jvm/jdk1.8.0_181/bin/java

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ sudo update-alternatives  --config java
and select the version you need

jacek@jacek-ixtreme-M5850:/usr/lib/jvm$ java -version

Set JAVA_HOME environment variable

edit the environment

sudo nano /etc/environment

and add the following line

JAVA_HOME="/usr/lib/jvm/jdk1.8.0_181"

Netbeans

Go to this page and click Download https://netbeans.org/

At the time of writing it has sent me to: https://netbeans.apache.org/download/nb90/nb90.html

that has let me to download a zip file.

Uncompressing the file and going to the bin directory lets you run netbeans.