About

This is a simple app provided to present a messaging system when a user is created in the application. Used technologies :

• JavaEE 8
• Kafka broker
• MySql database
• WildFly application server

Kafka Configuration

• To download Apache Kafka go to the following Url and get the latest version: https://kafka.apache.org/downloads

• This is a .gz file. Extract it in the root directory of a drive (e.g., c:) in your system.

• Go to the kafka folder kafka\bin\wondows. this is the folder where you see all .bat files. In order to test whether Kafka is working on your machine or not, open Command Prompt in this directory and type kafka.topics.bat. You will see a bunch of options and descriptions for this command.

• The last step for configuration will be adding this path C:\Kafka_folder\bin\windows to Environment Variables on windows.

Start kafka & Zookeeper

• In the kafka folder, add a new folder and name it data. Enter this data folder then create two new folders called zookeeper and another one kafka.

• Copy the directory path of the zookeeper folder and open zookeeper.properties in Config folder. Change the dataDir= to the directory zookeeper folder that you just copied. (replace slashes (\) with forward slashes (/))

dataDir=C:/kafka_folder/data/Zookeeper 

• In order for Kafka to run you must start zookeeper first. Go to the kafka folder and open Command Prompt in this directory. type following command to start zookeeper :

zookeeper-server-start.bat config\zookeeper.properties

If everything goes correct you should see binding to port 0.0.0.0/0.0.0.0:2181. For executing kafka you must keep zookeeper running.

• After that, copy \kafka\data\kafka directory path and past it in server.properties for log.dirs= attribute. (notice slash again!)

log.dirs=C:/kafka_folder/data/Kafka

• Open another Command prompt window in the kafka folder and type :

kafka-server-start.bat config\server.properties

you should see in logs kafka server id=0 started.