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Here's a complete roadmap to be a excellent Java Developer (with youtube videos):
1. Core Java
First comes the fundamentals of Java Programming, here you will understand OOP concepts, conditional statements, collection frameworks,and many more.https://www.youtube.com/playlist?list=PLd3UqWTnYXOnjGmyjD3zbIkyLXP15-6w0
2. JDBC
The JDBC API is a Java API that can access any kind of tabular data, especially data stored in a relational database.https://www.youtube.com/playlist?list=PLsyeobzWxl7rU7Jz3zDRpqB-EODzBbHOI
3. SQL
You will need good SQL knowledge to work with JDBC to write queries.https://www.youtube.com/watch?v=7S_tz1z_5bA
JSP is a Java standard technology that developers use to write web pages for web applications.
https://www.youtube.com/playlist?list=PLE0F6C1917A427E96
4. JSP + Servlet
Servlet is a server-side Java program module that handles client requests and implements the servlet interface.JSP is a Java standard technology that developers use to write web pages for web applications.
https://www.youtube.com/playlist?list=PLE0F6C1917A427E96
5. Spring Framework
5.1. Core Spring Framework
https://www.youtube.com/watch?v=GB8k2-Egfv0&feature=youtu.be5.2. Spring REST & Spring DATA
https://www.youtube.com/watch?v=GwYUjzPrQTM&feature=youtu.be5.3. Spring Security
Spring Security is the primary choice for implementing application-level security in Spring applications.https://www.youtube.com/watch?v=sm-8qfMWEV8
6. Hibernate Framework
Hibernate is a Java framework that simplifies the development of Java application to interact with the database. It is an open source, lightweight, ORM (Object Relational Mapping) tool.https://www.youtube.com/watch?v=Yv2xctJxE-w
7. Spring Boot
Spring Boot is the ultimate framework and Makes Java Web Development less boilerplate, it can help you make production-ready applications in no time.https://www.youtube.com/watch?v=msXL2oDexqw
8. Basic DevOps
8.1. Learn to Use AWS & Deploy Java Apps
https://www.youtube.com/playlist?list=PLVz2XdJiJQxxurKT1Dqz6rmiMuZNdClqv8.2. Learn Basic Docker
https://www.youtube.com/watch?v=p28piYY_wv8&feature=youtu.be8.3. Learn Basic Kubernetes
https://www.youtube.com/watch?v=rTNR7vDQDD8&feature=youtu.be8.4. Deploy Spring Boot App on Kubernetes
https://www.youtube.com/watch?v=EZolJ4lNiYc&feature=youtu.be9. Basic of git and GitHub
https://www.youtube.com/watch?v=apGV9Kg7ics10. Java Microservices
https://www.youtube.com/watch?v=tuJqH3AV0e8https://www.youtube.com/watch?v=y8IQb4ofjDo&list=PLqq-6Pq4lTTZSKAFG6aCDVDP86Qx4lNas
https://www.youtube.com/watch?v=rZ41y93P2Qo&list=PL9gnSGHSqcnr_DxHsP7AW9ftq0AtAyYqJ
https://www.youtube.com/watch?v=5_5oE5lgrhw&list=PLu0W_9lII9ahIappRPN0MCAgtOu3lQjQi
11. Data structure and algorithms in Java
https://www.youtube.com/watch?v=6iCHf7OZn6c&list=PL6Zs6LgrJj3tDXv8a_elC6eT_4R5gfX4dhttps://www.youtube.com/watch?v=rZ41y93P2Qo&list=PL9gnSGHSqcnr_DxHsP7AW9ftq0AtAyYqJ
https://www.youtube.com/watch?v=5_5oE5lgrhw&list=PLu0W_9lII9ahIappRPN0MCAgtOu3lQjQi