🍃SPRING: Annotation-based (@Component, @Autowired ...) configuration versus Java's configuration(@Configuration + @Beans) ?

📺 https://www.youtube.com/clip/Ugkxoiefot6YWLLFVHlBjM3UX1ciIIBNfntU

By Josh Long, Java Champion, and Spring Developer Advocate.

Transcript:

Vincent asked:

"𝑫𝒐 𝑰 𝒓𝒆𝒄𝒐𝒎𝒎𝒆𝒏𝒅 𝑨𝒏𝒏𝒐𝒕𝒂𝒕𝒊𝒐𝒏-𝒃𝒂𝒔𝒆𝒅 𝒄𝒐𝒏𝒇𝒊𝒈𝒖𝒓𝒂𝒕𝒊𝒐𝒏 (𝒘𝒊𝒕𝒉 @𝑪𝒐𝒎𝒑𝒐𝒏𝒆𝒏𝒕, @𝑨𝒖𝒕𝒐𝒘𝒊𝒓𝒆𝒅...) 𝒐𝒓 𝑱𝒂𝒗𝒂'𝒔 𝒄𝒐𝒏𝒇𝒊𝒈𝒖𝒓𝒂𝒕𝒊𝒐𝒏 (𝒘𝒊𝒕𝒉 @𝑪𝒐𝒏𝒇𝒊𝒈𝒖𝒓𝒂𝒕𝒊𝒐𝒏, 𝒂𝒏𝒅 𝒂𝒍𝒍 𝒕𝒉𝒆 @𝑩𝒆𝒂𝒏 𝒊𝒏 𝒊𝒕)?"

Humm, for your own components, 𝐲𝐨𝐮 𝐬𝐡𝐨𝐮𝐥𝐝 𝐚𝐥𝐦𝐨𝐬𝐭 𝐧𝐞𝐯𝐞𝐫 𝐮𝐬𝐞 @𝐀𝐮𝐭𝐨𝐰𝐢𝐫𝐞𝐝, maybe in your tests, that's it!

There's no reason for it anymore. You don't need it, you could have a constructor which defines parameters of types that are in your context, and Spring might call that and satisfy those parameters.

So there is no reason for @Autowired.

Definitely, don't do it on fields, @Autowired fields is hack and disgusting! 😁Don't do that.

But 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐨𝐰𝐧 𝐜𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬, 𝐥𝐢𝐤𝐞 𝐲𝐨𝐮𝐫 𝐜𝐮𝐬𝐭𝐨𝐦 𝐬𝐞𝐫𝐯𝐢𝐜𝐞𝐬, 𝐲𝐨𝐮𝐫 𝐫𝐞𝐩𝐨𝐬𝐢𝐭𝐨𝐫𝐢𝐞𝐬, 𝐚𝐧𝐝 𝐰𝐡𝐚𝐭𝐞𝐯𝐞𝐫, 𝐮𝐬𝐞 @𝐒𝐞𝐫𝐯𝐢𝐜𝐞, 𝐮𝐬𝐞 @𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭, @𝐑𝐞𝐩𝐨𝐬𝐢𝐭𝐨𝐫𝐲 𝐰𝐢𝐭𝐡 𝐢𝐦𝐩𝐮𝐧𝐢𝐭𝐲.

𝐁𝐮𝐭 𝐟𝐨𝐫 𝐢𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞, 𝐥𝐢𝐤𝐞 𝐲𝐨𝐮𝐫 𝐝𝐚𝐭𝐚 𝐬𝐨𝐮𝐫𝐜𝐞𝐬, 𝐚𝐧𝐝 𝐲𝐨𝐮𝐫 𝐭𝐞𝐦𝐩𝐥𝐚𝐭𝐞𝐬, 𝐚𝐧𝐝 𝐰𝐡𝐚𝐭𝐞𝐯𝐞𝐫, 𝐚𝐧𝐝 𝐬𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐲𝐨𝐮 𝐝𝐨𝐧'𝐭 𝐨𝐰𝐧 𝐭𝐡𝐞 𝐜𝐨𝐝𝐞 𝐲𝐨𝐮 𝐜𝐚𝐧 𝐜𝐡𝐚𝐧𝐠𝐞, 𝐭𝐡𝐞𝐧 𝐮𝐬𝐞 @𝐁𝐞𝐚𝐧.

Right! And make it match, you can inject things fine in your @Service, @Component, you can inject it in your bean methods.

And vice versa, you can inject the constructors of your @Service components, using @Bean.

#spring #configuration #java #youtube