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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:01,098 --> 00:00:01,931 Instructor: In this video, 2 00:00:01,931 --> 00:00:02,820 we'll cover field injection 3 00:00:02,820 --> 00:00:04,743 with Annotations and Autowiring. 4 00:00:07,560 --> 00:00:08,760 Now, as I discussed earlier, 5 00:00:08,760 --> 00:00:10,620 there are different Spring injection types, 6 00:00:10,620 --> 00:00:12,210 and so there are the types that are recommended 7 00:00:12,210 --> 00:00:14,100 by the spring.io development team. 8 00:00:14,100 --> 00:00:16,890 That's constructor injection for required dependencies, 9 00:00:16,890 --> 00:00:19,860 setter injection for optional dependencies. 10 00:00:19,860 --> 00:00:22,920 Now, here's an injection type that's not recommended 11 00:00:22,920 --> 00:00:24,027 by the spring.io development team 12 00:00:24,027 --> 00:00:26,133 and that's field injection. 13 00:00:30,000 --> 00:00:32,130 And field injection is no longer cool. 14 00:00:32,130 --> 00:00:33,210 So in the early days, 15 00:00:33,210 --> 00:00:36,450 field injection was very popular on Spring projects 16 00:00:36,450 --> 00:00:38,970 but in recent years it has fallen out of favor. 17 00:00:38,970 --> 00:00:39,900 And why is that? 18 00:00:39,900 --> 00:00:43,920 Because in general, it makes the code harder to unit test. 19 00:00:43,920 --> 00:00:45,900 Now, as a result, the spring.io team 20 00:00:45,900 --> 00:00:48,060 does not recommend field injection, 21 00:00:48,060 --> 00:00:51,360 however, you'll still see it being used on legacy projects, 22 00:00:51,360 --> 00:00:52,770 and also you'll see it being used 23 00:00:52,770 --> 00:00:55,740 in a lot of old blog posts on the internet, 24 00:00:55,740 --> 00:00:58,650 and even in previous versions of this course, 25 00:00:58,650 --> 00:01:00,720 I actually used field injection, 26 00:01:00,720 --> 00:01:02,760 but now with modern times here, 27 00:01:02,760 --> 00:01:04,500 removing the useless field injection, 28 00:01:04,500 --> 00:01:07,890 and instead making use of construction or setter injection, 29 00:01:07,890 --> 00:01:10,020 but I'll still show you a little quick example here 30 00:01:10,020 --> 00:01:12,990 of using field injection just in case you encounter it 31 00:01:12,990 --> 00:01:14,853 on some of your legacy projects. 32 00:01:18,360 --> 00:01:20,970 Field injection is the idea of injecting in dependencies 33 00:01:20,970 --> 00:01:24,060 by setting the values on your class directly, 34 00:01:24,060 --> 00:01:26,430 even on private fields, 35 00:01:26,430 --> 00:01:29,343 and this is accomplished by using Java Reflection. 36 00:01:32,310 --> 00:01:34,110 So in step one, you simply configure 37 00:01:34,110 --> 00:01:37,290 the dependency injection using the Autowired Annotation, 38 00:01:37,290 --> 00:01:40,380 and so here's a code example on our DemoController. 39 00:01:40,380 --> 00:01:43,530 Notice here we have this field private Coach, myCoach, 40 00:01:43,530 --> 00:01:45,783 and we give the Autowired Annotation, 41 00:01:47,250 --> 00:01:48,840 and behind the scenes, 42 00:01:48,840 --> 00:01:52,200 Spring will inject a given Coach implementation, 43 00:01:52,200 --> 00:01:55,320 and it'll do it behind the scenes even on a private field. 44 00:01:55,320 --> 00:01:59,160 It'll automatically or directly set it on this controller, 45 00:01:59,160 --> 00:02:02,250 and notice here, there's no need for constructors, 46 00:02:02,250 --> 00:02:03,900 there's no need for setters, 47 00:02:03,900 --> 00:02:06,093 Spring will set the field directly. 48 00:02:08,310 --> 00:02:09,389 However, like I mentioned, 49 00:02:09,389 --> 00:02:11,220 field injection is not recommended 50 00:02:11,220 --> 00:02:13,110 by the spring.io development team 51 00:02:13,110 --> 00:02:15,843 because it makes the code harder to unit test. 52 00:02:17,580 --> 00:02:18,960 All right, so that's field injection. 53 00:02:18,960 --> 00:02:20,340 So I wanted to show it to you 54 00:02:20,340 --> 00:02:21,750 just in case you encounter it 55 00:02:21,750 --> 00:02:23,763 on some of your legacy projects. 4334