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How to install Java with Jabba

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Runtime version managers make developers life easier. So, I tested different Java version managers. But, Jabba is the easiest one for me.

You can read previously posted How to install java articles.

How to install Java
How to install Java with brew and jenv

Installing Jabba

Click Jabba link to see more detailed information about Jabba

$ curl -sL https://github.com/shyiko/jabba/raw/master/install.sh | bash && . ~/.jabba/jabba.sh

Make sure to source jabba.sh in your environment if you skip it:

$ [ -s "$JABBA_HOME/jabba.sh" ] && source "$JABBA_HOME/jabba.sh"

If you don't have JAVA_HOME environment variable, run the following code:

$ echo 'export JAVA_HOME=$HOME/.jabba/jdk/openjdk@1.14.0-1/Contents/Home' >> ~/.bash_profile
$ echo 'export JAVA_HOME=$HOME/.jabba/jdk/openjdk@1.14.0-1/Contents/Home' >> ~/.bashrc
$ echo 'export JAVA_HOME=$HOME/.jabba/jdk/openjdk@1.14.0-1/Contents/Home' >> ~/.zshrc
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How to install Java with brew and jenv

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jenv is a tool that helps you switch between different java versions in your development machine. But, Jenv doesn't install Java for you.

Use your platform appropriate package manager to install Java. On macOS, brew is recommended.

Install Java with Homebrew

First, ensure that you have Homebrew installed in your system. Homebrew is a package manager for Mac OS. So if you want to learn more details about it, visit my blog below.

Homebrew package manager for Mac OS and Linux

I also posted how to install Java JDK manually in the following post.

How to install Java

Actually I already mentioned how to install Java JDK in the above post, but I will shortly show one more time

$ brew tap adoptopenjdk/openjdk
$ brew search jdk

==> Formulae
openjdk                                                                              openjdk@11

==> Casks
adoptopenjdk
adoptopenjdk12
adoptopenjdk13-openj9
adoptopenjdk14-openj9-jre-large
adoptopenjdk9
adoptopenjdk10
adoptopenjdk12-jre
adoptopenjdk13-openj9-jre
adoptopenjdk14-openj9-large
jdk-mission-control
adoptopenjdk11
adoptopenjdk12-openj9
adoptopenjdk13-openj9-jre-large
adoptopenjdk8
oracle-jdk
adoptopenjdk11-jre
adoptopenjdk12-openj9-jre
adoptopenjdk13-openj9-large
adoptopenjdk8-jre
oracle-jdk-javadoc
adoptopenjdk11-openj9
adoptopenjdk12-openj9-jre-large
adoptopenjdk14
adoptopenjdk8-openj9
sapmachine-jdk
adoptopenjdk11-openj9-jre
adoptopenjdk12-openj9-large
adoptopenjdk14-jre
adoptopenjdk8-openj9-jre
adoptopenjdk11-openj9-jre-large
adoptopenjdk13
adoptopenjdk14-openj9
adoptopenjdk8-openj9-jre-large
adoptopenjdk11-openj9-large
adoptopenjdk13-jre
adoptopenjdk14-openj9-jre
adoptopenjdk8-openj9-large
$ brew cask install adoptopenjdk
$ java --version

openjdk 14.0.1 2020-04-14
OpenJDK Runtime Environment AdoptOpenJDK (build 14.0.1+7)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 14.0.1+7, mixed mode, sharing)
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How to install Ansible with brew or pip

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You can install Ansible quickly in your system with Homebrew( or PIP(Package manager for Python)

Install Ansible with Homebrew

If you are using macOS, then you can use Homebrew.

First, ensure that you have Homebrew installed in your system. Homebrew is a package manager for Mac OS. So if you want to learn more details about it, visit my blog below.

Homebrew package manager for Mac OS and Linux

Run the following commands in your terminal. But, just copy commands without $ sign.

$ brew update
$ brew install ansible

Checking Ansible version

$ ansible --version
ansible 2.9.7
  config file = None
  configured module search path = ['/Users/kenanhancer/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /Users/kenanhancer/.pyenv/versions/3.8.2/lib/python3.8/site-packages/ansible
  executable location = /Users/kenanhancer/.pyenv/versions/3.8.2/bin/ansible
  python version = 3.8.2 (default, May  6 2020, 12:47:50) [Clang 11.0.3 (clang-1103.0.32.59)]

Install Ansible with PIP

Ensure that you have Python and PIP in your system. Check the following page about Python installation.

How to install Python with pyenv version manager
$ pip install ansible
$ ansible --version

Updating Ansible

$ pip install --upgrade ansible

Installing specific Ansible version

$ pip install ansible==2.2.2.0
$ pip install ansible==2.0.1.0

How to install Python with pyenv version manager

Posted on by admin

I am using different programming languages like C#, Java, Node.js etc.

So, I definitely need to switch between runtime environments.

For example, there are some package managers in Node.js community like nvm or n. I am very happy to use both of two package managers 🙂

Let's say I work for one Node.js project in dev machine with Node v8.0.0 but other project needs Node v6.0.0

In order to handle, different versions in same machine, we may use package managers.

I just want to find a way to switch between different Python version so that found pyenv package manager.

There are also others like asdf, gvm, nvm, rbenv package managers.

Pyenv installation

Click pyenv link for more detailed installation.

Installing pyenv with Homebrew

First, ensure that you have Homebrew installed in your system. Homebrew is a package manager for Mac OS. So if you want to learn more details about it, visit my blog below.

Homebrew package manager for Mac OS and Linux

Run the following commands in your terminal. But, just copy commands without $ sign.

$ brew update
$ brew install pyenv

Setting PATH

Run the following command for advanced configuration.

$ echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init -)"\nfi' >> ~/.bash_profile

Run the following command for basic configuration.

$ echo 'PATH=$(pyenv root)/shims:$PATH' >> ~/.bash_profile

and restart your terminal manually or run the following command to restart automatically.

$ exec "$SHELL"

Upgrading pyenv

$ brew upgrade pyenv

Uninstall pyenv

$ rm -rf $(pyenv root)
$ brew uninstall pyenv

Pyenv commands

List all Python versions installed in system

$ pyenv versions
  system
  3.7.3
* 3.8.2 (set by /Users/kenanhancer/.pyenv/version)

Show current active Python version in system

$ pyenv version
3.8.2 (set by /Users/kenanhancer/.pyenv/version)
Continue reading →

How to install Maven

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Downloading and Installing Maven

if you want to download Maven manually, download it from http://maven.apache.org/download.cgi

But you can download Maven programmatically as the following. So, run below script in your terminal.

wget https://downloads.apache.org/maven/maven-3/3.6.3/binaries/apache-maven-3.6.3-bin.tar.gz

tar -xzvf apache-maven*bin.tar.gz

# Fix the permissions:
# chown -R root:wheel Downloads/apache-maven*

mkdir /usr/local/apache-maven

mv apache-maven* /usr/local/apache-maven

rm apache-maven*

Setting environment variables in zsh

If you are using zsh, then run the following script in your terminal.

nano ~/.zshrc

export M2_HOME=/usr/local/apache-maven/apache-maven-3.6.3
export M2=$M2_HOME/bin
export PATH=$M2:$PATH

source ~/.zshrc

Setting environment variables in bash

nano ~/.bashrc

# add these three lines at the end of file and CTRL+X and Y and click enter :)

export M2_HOME=/usr/local/apache-maven/apache-maven-3.6.3
export M2=$M2_HOME/bin
export PATH=$M2:$PATH

source ~/.bashrc

Check Maven Version

# Verify if Maven is running
mvn -version

How to install Java

Posted on by admin

Downloading and Installing Java from OpenJDK

if you want to download OpenJDK manually, download it from https://jdk.java.net/

But you can download JDK programmatically as the following. Java SE 7, 8, 9, 10, 11, 12, 13 are included below script. So, run below script in your terminal.

# Java SE 7
wget https://download.java.net/openjdk/jdk7u75/ri/openjdk-7u75-b13-linux-x64-18_dec_2014.tar.gz

# Java SE 8
wget https://download.java.net/openjdk/jdk8u40/ri/openjdk-8u40-b25-linux-x64-10_feb_2015.tar.gz

# Java SE 9
wget https://download.java.net/java/GA/jdk9/9.0.4/binaries/openjdk-9.0.4_linux-x64_bin.tar.gz

# Java SE 10
wget https://download.java.net/java/GA/jdk10/10.0.2/19aef61b38124481863b1413dce1855f/13/openjdk-10.0.2_linux-x64_bin.tar.gz

# Java SE 11
wget https://download.java.net/java/GA/jdk11/9/GPL/openjdk-11.0.2_linux-x64_bin.tar.gz

# Java SE 12
wget https://download.java.net/java/GA/jdk12.0.2/e482c34c86bd4bf8b56c0b35558996b9/10/GPL/openjdk-12.0.2_linux-x64_bin.tar.gz

# Java SE 13
wget https://download.java.net/java/GA/jdk13/5b8a42f3905b406298b72d750b6919f6/33/GPL/openjdk-13_linux-x64_bin.tar.gz


mkdir /usr/lib/jvm


# Extract all downloaded jdk files
tar -xvzf openjdk-7u75-b13-linux-x64-18_dec_2014.tar.gz -C /usr/lib/jvm

tar -xvzf openjdk-8u40-b25-linux-x64-10_feb_2015.tar.gz -C /usr/lib/jvm

tar -xvzf openjdk-9.0.4_linux-x64_bin.tar.gz -C /usr/lib/jvm

tar -xvzf openjdk-10.0.2_linux-x64_bin.tar.gz -C /usr/lib/jvm

tar -xvzf openjdk-11.0.2_linux-x64_bin.tar.gz -C /usr/lib/jvm

tar -xvzf openjdk-12.0.2_linux-x64_bin.tar.gz -C /usr/lib/jvm

tar -xvzf openjdk-13_linux-x64_bin.tar.gz -C /usr/lib/jvm



# Remove downloaded jdk files
rm openjdk*


# Install Java and Java Compiler to Environment
update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-se-7u75-ri/bin/java 1

update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-se-7u75-ri/bin/javac 1

update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-se-8u40-ri/bin/java 2

update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-se-8u40-ri/bin/javac 2

update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-9.0.4/bin/java 3

update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-9.0.4/bin/javac 3

update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-10.0.2/bin/java 4

update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-10.0.2/bin/javac 4

update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-11.0.2/bin/java 5

update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-11.0.2/bin/javac 5

update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-12.0.2/bin/java 6

update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-12.0.2/bin/javac 6

update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-13/bin/java 7

update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-13/bin/javac 7



# Verify Java and Java Compiler Installation
# check if java command is pointing to correct path in system
update-alternatives --display java
update-alternatives --display javac

# List all environment variables
update-alternatives --get-selections
# or
update-alternatives --get-selections | grep java
# or
update-alternatives --get-selections | grep ^java

Check Java Version

# Verify if Java is running
java -version

# Verify if Java Compiler is running
javac -version

GitHub clone all repositories

Posted on by admin

After you join an organization, you will need to clone all git repositories in your machine probably. 🙂

So first follow this post https://kenanhancer.com/2018/11/08/github-connect-with-your-ssh-public-key/ to create a ssh key in your machine and put in github then you can clone all repositories for any user.

if you have any authentication issue, then create an access token from github, copy and paste instead of {acceess-token} in the following code.

curl -u {access-token}:x-oauth-basic -s https://api.github.com/users/kenanhancer/repos?per_page=2 | grep ssh_url | awk -F '"' '{print $4}' | xargs -n 1 -P 4 git clone

In order to learn github API endpoint urls, use the following code.

curl https://api.github.com/

To learn more details about official GitHub REST API v3, use the following link.

https://developer.github.com/v3/