TLDR:

PART 1:

    core Java
    web concepts: HTTP protocol and basics of HTML, JavaScript, CSS
    Maven
    MVC Pattern, Servlets, Thymeleaf/JSP
    MySQL/Postgres
    JDBC
    Write 1st app (Servlets + JDBC + MySql/Postgres + JSP/Thymleaf)

PART 2:

    JPA, ORM, Hibernate
    Spring
    Write 2nd app (Spring Boot + Hibernate/Spring Data + MySQL/Postgres + Thymeleaf/JSP)

PART 3:


    Design Patterns and Data Structures
    Theory of tests, JUnit, Mockito
    Messaging systems, topics, queues, JMS, ActiveMQ/RabbitMQ
    Websockets, STOMP
    REST API concepts
    Consuming external APIs
    Write 3rd app (REST API + all learned technologies)