It sounds like you are looking for a code review. Comments:
1) Regardless of what the user enters, your setters hard code values in Login.java
2) Variable names traditionally begin with lower case letters. In Login.java, you have Username as a variable.
3) Why are you using the email as the password?
4) You have infinite recursion. The doGet method calls this.doGet(request, response); Which will keep running the same goGet method with the same parameters until you kill it.
Aside from the above and the fact that you aren't actually validating passwords yet, it looks good.