Adding an object from URL to DB, Assign links

Did adding different objects from URL to DB; Did assignment links
between Employee&Department and Employee&Project
Fixed bug with /add*

/addEmployee, /addDepartment, /addProject works
How to test: Run App.java
Put in URL:
http://localhost:12345/addEmployee?data={id:18,name:Cynthia,age:25}
http://localhost:12345/addDepartment?data={id:13,name:HR}
http://localhost:12345/addProject?data={id:18,name:PromoteJava}
Small corrections
Corrections_2