How much do you need to know java for Spring Framework? And why is java EE needed?

Question

Java

Do I need to know EE for Spring? Why is spring needed? What to teach and study?

Answer 1

You need to know Java SE + Servlet API (this is already from Java EE).
Spring provides all the same features (IoC and DI, transactions, etc.) as Java EE, only easier to use and does not need an application server (jboss, glassfish), just tomcat or jetty.
Java EE is a set of specifications and interfaces implemented by application server vendors (jboss, glassfish). Spring - as a simple alternative.

Answer 2

How much English do you need to know to read Shakespeare in the original?