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These are the user uploaded subtitles that are being translated: 1 1 00:00:01,541 --> 00:00:02,552 Alrighty, so let's go ahead 2 2 00:00:02,552 --> 00:00:04,779 and move into Eclipse, and what we're going to do 3 3 00:00:04,779 --> 00:00:06,275 is actually go through the demo 4 4 00:00:06,275 --> 00:00:09,816 of using default bean ids with Spring, 5 5 00:00:09,816 --> 00:00:11,583 and what I'd like to do is continue 6 6 00:00:11,583 --> 00:00:13,198 to use an existing project, 7 7 00:00:13,198 --> 00:00:14,439 and we're going to make some modifications 8 8 00:00:14,439 --> 00:00:16,166 to our TennisCoach, 9 9 00:00:16,166 --> 00:00:19,015 and what we're going to do actually with this TennisCoach 10 10 00:00:19,015 --> 00:00:20,763 is that we're actually going to remove 11 11 00:00:20,763 --> 00:00:24,236 the explicit bean id from that class, 12 12 00:00:24,236 --> 00:00:26,886 so right now on line five I give the explicit bean id 13 13 00:00:26,886 --> 00:00:29,983 of thatSillyCoach, and what I want to do 14 14 00:00:29,983 --> 00:00:31,816 is actually remove it. 15 15 00:00:32,958 --> 00:00:36,789 We want to have Spring linkings of the default bean id, 16 16 00:00:36,789 --> 00:00:39,841 so I'll just simply highlight this whole section here 17 17 00:00:39,841 --> 00:00:42,616 of that explicit bean id, and I'll just hit the delete key 18 18 00:00:42,616 --> 00:00:45,763 to actually remove this from my TennisCoach, 19 19 00:00:45,763 --> 00:00:47,930 from my TennisCoach class. 20 20 00:00:49,269 --> 00:00:51,894 Alright so there we go, so now just add component. 21 21 00:00:51,894 --> 00:00:54,446 Note here that this will now use the default bean id 22 22 00:00:54,446 --> 00:00:56,666 because we didn't explicitly give one, 23 23 00:00:56,666 --> 00:00:58,162 and remember the default bean id 24 24 00:00:58,162 --> 00:00:59,962 is the same name as the class except 25 25 00:00:59,962 --> 00:01:03,212 that the first character is lower case. 26 26 00:01:04,804 --> 00:01:07,753 Alright, so now let's go ahead and move 27 27 00:01:07,753 --> 00:01:09,634 into our actual application because we'll need 28 28 00:01:09,634 --> 00:01:10,932 to make some changes to our app 29 29 00:01:10,932 --> 00:01:13,849 when we actually retrieve the bean. 30 30 00:01:15,886 --> 00:01:18,636 So here's my annotation demo app, 31 31 00:01:20,068 --> 00:01:24,060 and I'm going to move down to lines 13 and 14, 32 32 00:01:24,060 --> 00:01:25,804 so this is where we actually get the bean 33 33 00:01:25,804 --> 00:01:28,738 from the Spring container, and I'm going to modify 34 34 00:01:28,738 --> 00:01:32,747 this code now to actually use the default bean id, 35 35 00:01:32,747 --> 00:01:36,172 so instead of using thatSillyCoach, 36 36 00:01:36,172 --> 00:01:39,755 I'm actually going to remove this reference 37 37 00:01:41,733 --> 00:01:45,007 and instead I'll use the default bean id, 38 38 00:01:45,007 --> 00:01:47,759 tennisCoach, again same name as the class, 39 39 00:01:47,759 --> 00:01:50,336 the first character is lowercase. 40 40 00:01:50,336 --> 00:01:52,240 So that'll actually retrieve this bean 41 41 00:01:52,240 --> 00:01:54,608 from the Spring container, then I can use it 42 42 00:01:54,608 --> 00:01:56,858 later on in my application. 43 43 00:01:57,836 --> 00:02:01,925 Alright, so this looks pretty good so far. 44 44 00:02:01,925 --> 00:02:04,017 Alright so let's go ahead and save this application. 45 45 00:02:04,017 --> 00:02:05,643 Let's go ahead and run it. 46 46 00:02:05,643 --> 00:02:07,661 So I'll simply do my right click, 47 47 00:02:07,661 --> 00:02:11,828 I choose run as, I choose run as a Java application. 48 48 00:02:14,478 --> 00:02:15,709 Okay great, so it's up and running. 49 49 00:02:15,709 --> 00:02:17,209 Here's our output. 50 50 00:02:18,379 --> 00:02:20,701 So we read the information from the configuration file. 51 51 00:02:20,701 --> 00:02:23,336 It does the component scanning, and good, 52 52 00:02:23,336 --> 00:02:25,449 so we get our output, practice your backhand volley, 53 53 00:02:25,449 --> 00:02:27,028 so this is good, so it means that hey, 54 54 00:02:27,028 --> 00:02:29,823 it found the bean and we were able to call our method on, 55 55 00:02:29,823 --> 00:02:30,845 so this is all good, 56 56 00:02:30,845 --> 00:02:33,295 so the use of that default bean id 57 57 00:02:33,295 --> 00:02:36,781 worked out just fine for us, and that's great. 58 58 00:02:36,781 --> 00:02:38,232 I'm kind of happy about that. 59 59 00:02:38,232 --> 00:02:41,123 But I want to try and break some things here. 60 60 00:02:41,123 --> 00:02:44,543 When everything runs fine, you're like okay, cool, 61 61 00:02:44,543 --> 00:02:46,266 it's fine, but let's try and break it, 62 62 00:02:46,266 --> 00:02:48,657 and the way I'm going to try and break this 63 63 00:02:48,657 --> 00:02:52,698 is that when I get the bean from the Spring container, 64 64 00:02:52,698 --> 00:02:55,561 instead of using the default id, 65 65 00:02:55,561 --> 00:02:57,644 I'm actually going to use thatSillyCoach. 66 66 00:02:57,644 --> 00:03:00,313 That's what I had before. 67 67 00:03:00,313 --> 00:03:01,451 I'm going to use thatSillyCoach, 68 68 00:03:01,451 --> 00:03:05,451 but our TennisCoach doesn't have thatSillyCoach. 69 69 00:03:06,944 --> 00:03:08,427 They're simply using the default id, 70 70 00:03:08,427 --> 00:03:11,353 so here I'm trying to call thatSillyCoach, 71 71 00:03:11,353 --> 00:03:15,160 you know, trying to break things here, okay. 72 72 00:03:15,160 --> 00:03:17,961 So let's run this and let's see what all happens, 73 73 00:03:17,961 --> 00:03:21,461 so right click, run as a Java application. 74 74 00:03:22,588 --> 00:03:26,204 And it's running and then it kind of blows up on us, 75 75 00:03:26,204 --> 00:03:29,862 you know, with the exception and this ugly stack trace. 76 76 00:03:29,862 --> 00:03:30,862 Aye aye aye. 77 77 00:03:31,951 --> 00:03:33,252 Alright, let's see what the problem is. 78 78 00:03:33,252 --> 00:03:36,503 Oh, no such bean definition, so no bean named 79 79 00:03:36,503 --> 00:03:38,708 thatSillyCoach is a find. 80 80 00:03:38,708 --> 00:03:42,540 Hmm, so the explicit name is not given on the class, 81 81 00:03:42,540 --> 00:03:45,439 so that means when Spring does the component scanning, 82 82 00:03:45,439 --> 00:03:49,204 the bean is registered with its default bean id, 83 83 00:03:49,204 --> 00:03:52,185 so in our code we'd have to use a default bean id 84 84 00:03:52,185 --> 00:03:53,961 to actually retrieve it. 85 85 00:03:53,961 --> 00:03:56,491 Ah, okay so that's it, but this is really good. 86 86 00:03:56,491 --> 00:03:58,000 I'm glad you're seeing this error now 87 87 00:03:58,000 --> 00:03:59,465 because you may see this when you write 88 88 00:03:59,465 --> 00:04:01,290 some of your other Spring applications. 89 89 00:04:01,290 --> 00:04:02,902 You have to make sure you use the correct name 90 90 00:04:02,902 --> 00:04:06,385 when you retreat it, so here back in my code, 91 91 00:04:06,385 --> 00:04:09,707 I'm going back and I'm putting in the default bean id 92 92 00:04:09,707 --> 00:04:13,545 of tennisCoach, just to make sure that everything 93 93 00:04:13,545 --> 00:04:16,661 will work properly because it's actually defined 94 94 00:04:16,661 --> 00:04:18,828 using the default bean id. 95 95 00:04:20,168 --> 00:04:21,839 Right click, run as, Java app, 96 96 00:04:21,839 --> 00:04:23,802 and this time everything's going to work out just fine 97 97 00:04:23,802 --> 00:04:25,322 for us, just like it did earlier 98 98 00:04:25,322 --> 00:04:27,761 when we first ran the application, 99 99 00:04:27,761 --> 00:04:30,106 so it found the bean and it printed out the method 100 100 00:04:30,106 --> 00:04:31,973 and so on, so again, just make sure you use 101 101 00:04:31,973 --> 00:04:35,400 the correct bean id when you write your application, 102 102 00:04:35,400 --> 00:04:39,498 so either a explicit bean id or the default bean id, 103 103 00:04:39,498 --> 00:04:42,598 and it all depends on how that bean is actually defined, 104 104 00:04:42,598 --> 00:04:44,200 and you can always find this out 105 105 00:04:44,200 --> 00:04:45,861 by simply looking at the source code 106 106 00:04:45,861 --> 00:04:47,403 and looking at the definition 107 107 00:04:47,403 --> 00:04:50,514 of the at component annotation. 108 108 00:04:50,514 --> 00:04:51,983 Alright, so hopefully you enjoyed this. 109 109 00:04:51,983 --> 00:04:53,346 We showed you the happy path 110 110 00:04:53,346 --> 00:04:55,849 and then I also showed you what will happen 111 111 00:04:55,849 --> 00:04:58,177 if I break it and we run into errors, 112 112 00:04:58,177 --> 00:05:00,320 and then finally how to put it all back together 113 113 00:05:00,320 --> 00:05:01,834 and resolve it. 114 114 00:05:01,834 --> 00:05:03,018 Okay great. 115 115 00:05:03,018 --> 00:05:05,536 So these are some really good tips and tricks for you. 116 116 00:05:05,536 --> 00:05:07,499 You were successful here in making use 117 117 00:05:07,499 --> 00:05:08,900 of the default bean id, 118 118 00:05:08,900 --> 00:05:11,399 and I say congratulations and I will see you 119 119 00:05:11,399 --> 00:05:12,899 in the next video. 10367