Spring Boot Dependency Injection - What Is It? Tutorial and Example

In this video we look at dependency injection in Spring. We'll talk about qualifiers, autowired and interface. Stay all the way to the end to find out how it all works and learn about my giveaway!

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[frankyvertriest]

It's better to use constructor injection for testability. Your methodnames also need to start with a small letter

[akshitaagarwal]

This video was gold! I was beginning to think I would never understand autowiring. Thank you!

[shefalshukur]

Awesome explanation of dependency Injection! Ultimately I got some source where explanation is clear without confusion! Thank you.

[asmodeos]

Thanks for explaining this rather simply, but I think the last part of the video counters the use of DI completely. If you use an abstraction in a class but you need need to provide a qualifier with it that matches the one of the implementation you want then it basically is equivalent as new-ing the implementation up in the class directly. Your class is now directly tied to the implementation through its qualifier which is precisely what we try to avoid with DI and IoC. The class shouldn't be responsible of this, it should be configured elsewhere.

[DunTrann]

Thanks sir! I respected your explanation

[xahmiyuto]

Best Video on Dependency Injection. TY

[anar.xocayev]

Very good explanations for Dependency Injection in Spring Boot. thanks

[this-is-bioman]

This is counterintuitive. Why do you decorate a field with @Autowired and then assign a value to it in the constructor anyway? If it should be autowired then why do you wire it yourself? Also I wouldn't call wireing a field dependency-injection. It's rather dependency-hacking. How would you override this for testing when it's virtually a hardcoded dependency?

[Kalashnikova]

Great video man! thanks for taking the time to show us.
Cheers from Guadalajara

[moem]

Hey Erik, thanks for this post! Great example for the @Autowired and @Qualifier!

[devolee]

Man... this is by far the easiest and cleanest explanation I found on Youtube regarding dependency injection. Go Erik..!

[MrMakemusicmike]

Youre a great communicator.
Thanks 👍🏾

[murilo.g.t]

Great video ! Solved a lot of my struggles with dependency injection.

[jainamshah]

Still at the end of video with two implementation you need qualifier which induces tightly coupleness

[stefan]

Thanks, Erik, nice lesson! Keep them coming. :)

[TheFailCrewTM]

Hey Erik, what do i do if i have a Component that has a parameter in its constructor? For example a String. How can i account for this paramter in my RestController class when i AutoWire the Component?

[hitendrasonkushare]

Is there any video series about spring boot from the beginning? On YouTube

[AnNguyen-dqmn]

Thank you for the video. Can you please create a video on how to pull data from sql and display on the UI?

[keyboardbandit]

Thank you for this! Makes so much more sense now!

[paulfrischknecht]

Use lombok RequiredArgsConstructor and declare dependencies as private final