Springboot Java Kafka_2.12-2.8.0 repo

(This demo was implemented on ubuntu 18.04)

It includes:

	1) Apache Kafka 2.12-2.8.0 Installation

	2) MyKafkaProducer Springboot Application 

	3) MyKafkaConsumer Springboot Application (which listens kafka msgs forever) 

Step 1

Installing Kafka 2.12-2.8.0

1.1) download binaries - 'kafka_2.12-2.8.0.tgz' from:
     https://github.com/ravibalsuni/springboot-java-kafka/kafka_2.12-2.8.0.tgz

1.2) Unzip the folder you downloaded in the required installation path as per your choice. 
     The contents extract to a folder named "kafka_2.12-2.8.0"
     e.g. /home/ravi/Downloads/kafka_2.12-2.8.0.tgz

1.3) my installation directory for reference -  /home/ravi/kafka-installation/kafka_2.12-2.8.0

1.4) create following scripts to start Zookeeper first and then Kafka
     start-kafka.sh		https://github.com/ravibalsuni/springboot-java-kafka/start-kafka.sh
     stop-kafka.sh		https://github.com/ravibalsuni/springboot-java-kafka/stop-kafka.sh
     start-zookeeper.sh		https://github.com/ravibalsuni/springboot-java-kafka/start-zookeeper.sh
     stop-zookeeper.sh		https://github.com/ravibalsuni/springboot-java-kafka/stop-zookeeper.sh

1.5) modify these script files with your installation path as per point 1.3) 
     i.e. replace line 1 of all the script files
     	cd /home/ravi/kafka-installation/kafka_2.12-2.8.0/
     as per your installation path

1.6) run following command to start zookeeper server first (use your installation path as per 1.3) above )
	 
	 /home/ravi/kafka-installation/start-zookeeper.sh
	
	 or
	 
	 cd  /home/ravi/kafka-installation
	 ./start-zookeeper.sh

	# Note - Zookeeper user following port by default "zookeeper.connect=localhost:2181" and "clientPort=2181"
	  located at -
	   ( 
		/home/ravi/kafka-installation/kafka_2.12-2.8.0/config/server.properties
			and
		/home/ravi/kafka-installation/kafka_2.12-2.8.0/config/zookeeper.properties
	   )

	# Error
		
		if the server is not running up try to change the port number in above files
		or you can use 	following command - sudo kill -9 `sudo lsof -t -i:2181`and 
		re-try this step 1.6) again by running start-zookeeper.sh script

1.7) similarly run following command to start kafka server

	 /home/ravi/kafka-installation/start-kafka.sh

	 or

	 cd  /home/ravi/kafka-installation
	 ./start-kafka.sh

Step 2

Refer MyKafkaProducer Springboot Project to send few messages on topic created in TopicConfig.java file
We use following topic - "my-kafka-topic" to produce messages 

Step 3

Refer MyKafkaConsumer Springboot Project to receive few messages from topic created in the above Step 2 
We use same topic - "my-kafka-topic" to consume messages