June 2017
Intermediate to advanced
496 pages
14h 4m
English
Content preview from Mastering Spring 5.0
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The @Autowired annotation in depth
When @Autowired is used on a dependency, the application context searches for a matching dependency. By default, all dependencies that are autowired are required.
Possible results are as follows:
- One match is found: This is the dependency you are looking for
- More than one match is found: Autowiring fails
- No match is found: Autowiring fails
Cases where more than one candidate is found can be resolved in two ways:
- Use the @Primary annotation to mark one of the candidates as the one to be used
- Use @Qualifier to further qualify autowiring
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.