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Prerequisites for learning J2EE include:

1. Basic knowledge of Java (Core Java).

2. Understanding of Object-Oriented Programming (OOP) concepts.

3. Familiarity with Servlets and JSP (JavaServer Pages).

4. Knowledge of HTML, CSS, and JavaScript.

5. Basic understanding of Databas

es and SQL.

Skills required for a Java J2EE developer include:

1. Proficiency in Core Java (OOP, collections, multithreading).

2. Knowledge of J2EE technologies (Servlets, JSP, EJB).

3. Experience with Databases (SQL, JDBC).

4. Familiarity with Web frameworks (Spring, Hibernate).

5. Understanding of Web Services (SOAP, REST).

6. Knowledge of Design Patterns and MVC architecture.

7. Experience with IDE (Eclipse, IntelliJ IDEA).

8. Basic understanding of Ve

rsion Control (Git).

Java: The base programming language.

Core Java: Basic concepts of Java like OOP, collections, exceptions, threads, etc.

Advanced Java: Advanced features like networking, database connectivity, and multithreading.

J2EE: Java 2 Platform, Enterprise Edition, used for building large-scale, enterprise-level applications (includes Servlets, JSP, EJB, et

c.).