I can tell you the topics but I can’t recommend any resources. You can acquire and read the source for all the following. Also, reading the JDK source for class

I can tell you the topics but I can’t recommend any resources. You can acquire and read the source for all the following. Also, reading the JDK source for classes that you use all the time is very educational. Spring (core, testing, web (classic, reactive), data, security) Hibernate: sucks but learn it. Basic app container: Tomcat setup. Building with Gradle and Maven If you have your own toy SPA toy product, use it as a vehicle to apply coursework. Modern Java is perfectly fine. Try to learn idiomatic 9 or 11, most employers will still be on 8 but know they need to upgrade eventually.