org.codehaus.jackson vs com.fasterxml.jackson.core

 Jackson has two version 1.x and 2.x  and both has different Java packages and Maven artifact.

 1.x is old version which has project structure org.codehaus.jackson and was developed on  http://jira.codehaus.org 

2.x is new version which has migrated on Github and it has new project structure com.fasterxml.jackson

Now only Jackson 2 (com.fasterxml.jackson) is being developed actively.  As Jackson 1 and Jackson 2 both uses different packages so they can remain together without conflict in our the project. It helps in smooth migration of our project from Jackson 1 to Jackson 2.

Find the reference link

https://github.com/FasterXML/jackson