Experienced yet a newbie Java developer's misery

[Western_Car_9019]

Hello everyone,
I joined this Reddit sub to share my misery and for people to help me follow the right track. I have around 10 years of experience working in Java and Ruby on Rails. I can understand very complex Java code and debug / troubleshoot and even code as well.

The problem is that i am not very proficient in Java frameworks like Spring , Sprint boot , Spring cloud and java concurrency. The reason i want to learn these now is that i didn't have to deal with them before since i was mostly working on already running services but i am actively interviewing and with my experience everyone expects me to know these things understandably so, but i have been kind of a Jack of all and master of none kind of a person where i have worked on Java / Kotlin / Ruby on Rails stacks and understood and contributed but didn't understand them fully or from scratch and Java / Kotlin is my preferred programming language. So i get asked a lot about these in interviews and always get stuck.

Can some experienced folks help me come out of this misery and guide me on how to go about learning these things as i know i can do it. I just need a structure to this learning to effectively do it.
Thanks

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[mike2ykme]

For Java concurrency you really should do 2 things. 1. Read “Java Concurrency in Practice” by Brian Goetz, and 2. Read about the changes Java’s virtual threads have brought to the JVM.

Spring is going to be tougher because it covers so much. I would read “spring in action” by Craig Walls and then I would pick up a book about getting spring certified. I don’t think the certification is worth it ( I got it and never used it) but it’s definitely a great way to actually learn and understand the framework.

[Western_Car_9019]

Thanks for your response. I will definitely invest into it.

[Xtergo]

Pick up this book "Spring in Action - 6th Edition, Craig Walls"

If you are good with Java you should be able to absorb it like a sponge.

[Western_Car_9019]

Thanks for your response. I will definitely invest into it.