How to install Java with brew and jenv

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.

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

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

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.

$ 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.

$ 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

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, gvmnvmrbenv package managers.

Pyenv installation

Click pyenv link for more detailed installation.

I just want to show Homebrew(click for installation). Homebrew is a Package Manager for macOS

Installing pyenv with Homebrew

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

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

and restart your terminal.

Upgrading pyenv

$ brew upgrade pyenv

Uninstall pyenv

$ 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)
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Node.js nut-ioc usage

nut-ioc npm package is a simple, lightweight and fast IoC Container Framework.

nut-ioc injects dependencies run-time so that developers don't need to require modules.

Developers can implement in their codes following OOP basics, principles, patterns and concepts and probably more than that 🙂

  • Separation of Concern(SoC)
  • Single Responsibility Principle(SRP)
  • Open Closed Principle
  • Dipendency Inversion(Injection) Principle(DIP)
  • Chain of Responsibility Pattern
  • Aspect Oriented Programming

you can reach github repository.

https://github.com/nodejs-projects-kenanhancer/nut-ioc

Installing nut-ioc with npm

npm i nut-ioc

Demo GitHub Repository

You can find different usages of nut-ioc framework in separate brances.

https://github.com/nodejs-projects-kenanhancer/nut-ioc-basic-demo.git

Branch list
load-dependencies-with-dependencyPath
load-dependencies-with-dependencyPath-and_dynamically
load-dependencies-with-different-loaders
load-dependencies-with-interceptors
load-dependencies-with-new-loaders-and-filters
load-dependencies-with-programatic-notation
nut-swagger-usage
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How to install Maven

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 Kafka

Downloading

wget "https://archive.apache.org/dist/kafka/1.1.0/kafka_2.11-1.1.0.tgz"

tar -xzf kafka_2.11-1.1.0.tgz

Starting Zookeeper and kafka

bin/zookeeper-server-start.sh config/zookeeper.properties
bin/kafka-server-start.sh config/server.properties

Create topic

bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic test

List topics

bin/kafka-topics.sh --list --bootstrap-server localhost:9092

or

bin/kafka-topics.sh --list --zookeeper localhost:2181

Send some messages to Kafka

bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test

or

bin/kafka-console-producer.sh --zookeeper localhost:2181 --topic test

Consume messages from Kafka

bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning

How to install Java

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

ES6 (ECMAScript 2015) Class Usage

There are some new features in ES6(ECMAScript 2015) like the following. But, we will focus on classes.

  • JavaScript let
  • JavaScript const
  • JavaScript Arrow Functions
  • JavaScript Classes
  • Default parameter values
  • Array.find()
  • Array.findIndex()

Class Declaration Syntax

Instance properties must be defined inside of class methods.

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