softwares_installation/Softwares_installation at master · javaexpresschannel/softwares_installation · GitHub

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Steps to install java:
----------------------
sudo apt-get install default-jdk
java -version

Steps to install Maven
----------------------
sudo apt install maven
mvn -version

Steps to install Git
----------------------
sudo apt install git
git --version
git config --global user.name "JavaExpress"
git config --global user.email "javaexpresschannel@gmail.com"

Steps to install Jenkins
----------------------
sudo wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt update
sudo apt install jenkins
sudo sysemctl start jenkins
sudo systemctl status jenkins
sudo systemctl restart jenkins
sudo systemctl enable jenkins ( Bootup start)

How to give sudo permissions for jenkins user in Ubuntu machine?

Open a file using vi editor or gedit in ubuntu
1) sudo vi /etc/sudoers or sudo gedit /etc/sudoers
2) add below line in sudoers file
jenkins ALL=(ALL) NOPASSWD: ALL
3)sudo systemctl restart jenkins

How to find out java path in Ubuntu ?
-------------------------------------
find /usr/lib/jvm/java-1.8* | head -3

How to remove java manually from ubuntu ?
-------------------------------------
sudo rm -rf /usr/lib/jvm/*

How to set java path in Ubuntu
-------------------------------------
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH

How to search java available in ubuntu ?
apt search openjdk


Issues while installating java in Ubuntu
-------------------------------------
'1) sudo apt install openjdk-8-jre-headless ( depend on which version u are installating)
Reading package lists... Done
Building dependency tree
Reading state information... Done
openjdk-8-jre-headless is already the newest version (8u131-b11-2ubuntu1.16.04.3).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


2) sudo apt install openjdk-8-jre-headless --reinstall

Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/27.0 MB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 160472 files and directories currently installed.)
Preparing to unpack .../openjdk-8-jre-headless_8u131-b11-2ubuntu1.16.04.3_amd64.deb ...
Unpacking openjdk-8-jre-headless:amd64 (8u131-b11-2ubuntu1.16.04.3) over (8u131-b11-2ubuntu1.16.04.3) ...
Setting up openjdk-8-jre-headless:amd64 (8u131-b11-2ubuntu1.16.04.3) ...
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /usr/lib/jvm/java-9-openjdk-amd64/bin/java (part of link group java)

if still facing to install java then remove total java software from ubuntu machine

1)sudo apt remove --purge openjdk-8-jre-headless ( depend on which version u are installating)
2)sudo apt autoremove
3)sudo apt install --reinstall openjdk-8-jre-headless
4)java -version

javaexpress@javaexpress-VirtualBox:~$ java -version
openjdk version "1.8.0_252"
OpenJDK Runtime Environment (build 1.8.0_252-8u252-b09-1ubuntu1-b09)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)

lsb_release -a
it will give information about your OS informatin & CodeName

apt policy jenkins
glen@Xen2:~$ apt policy daemon