chef

1. https://learn.chef.io/tracks 

ecommerce

1. https://www.javainuse.com/fullstack/ecommerce

kafka

1. https://www.javainuse.com/misc/apache-kafka-hello-world

method comment in eclipse

1. Following are the steps to add method comments-
2. preferences
1. Java
1. Code Style
1. Code Templates
1. method
1. Insert variable
3.  Now to test the above
1. just type /** and press enter before a method
4. 
   

STS

1. https://stackoverflow.com/questions/45457538/ctrl-shift-o-for-organize-import-not-working-in-sts

json

1. http://tutorials.jenkov.com/java-json/jackson-objectmapper.html
2. http://jsonviewer.stack.hu/ 
3. https://www.baeldung.com/jackson-object-mapper-tutorial
4.  

ubuntu permission

sudo chmod -R 777 /* to give permission to the folder and all its contents recursively