WEBVTT 1 00:00:03.474 --> 00:00:06.132 JMS, for Java Message Service, 2 00:00:06.132 --> 00:00:08.967 allows you to send messages to a message queue 3 00:00:08.967 --> 00:00:11.000 in an asynchronous fashion. 4 00:00:11.000 --> 00:00:13.500 That's a core part of JAVA EE. 5 00:00:14.400 --> 00:00:16.718 Here, they basically provide helper classes 6 00:00:16.718 --> 00:00:19.783 to allow you to make use of the Java Message Service, 7 00:00:19.783 --> 00:00:22.857 and again, you can reduce your code by over 50% 8 00:00:22.857 --> 00:00:26.574 by making use of Spring's JMS integration. 9 00:00:26.574 --> 00:00:28.000 And then also, Spring has support 10 00:00:28.000 --> 00:00:31.234 for a transaction manager or supporting transactions, 11 00:00:31.234 --> 00:00:34.499 and you can do this in a very lightweight fashion. 12 00:00:34.499 --> 00:00:36.857 So you can make use of transactions on methods, 13 00:00:36.857 --> 00:00:39.519 on database calls, and pretty much anything you want. 14 00:00:39.519 --> 00:00:40.700 It's very flexible. 15 00:00:40.700 --> 00:00:44.659 And a lot of other projects in the world or on the web, 16 00:00:44.659 --> 00:00:48.242 make use of the Spring transaction manager. 17 00:00:52.058 --> 00:00:55.299 This is basically the home for the Spring MVC framework. 18 00:00:55.299 --> 00:00:57.308 So you can build web applications 19 00:00:57.308 --> 00:01:00.472 using the Spring Core, and also making use 20 00:01:00.472 --> 00:01:03.749 of Spring Controllers and Spring View, 21 00:01:03.749 --> 00:01:06.425 so you have a full MVC layout here, 22 00:01:06.425 --> 00:01:10.017 and we'll cover this a good deal later on in the course. 23 00:01:10.017 --> 00:01:11.999 They also have other modules here 24 00:01:11.999 --> 00:01:13.517 where you can actually interface 25 00:01:13.517 --> 00:01:16.958 with other web technologies, like maybe JSF or Struts, 26 00:01:16.958 --> 00:01:19.633 you can do that, but pretty much, 27 00:01:19.633 --> 00:01:20.691 if you're using Spring already, 28 00:01:20.691 --> 00:01:23.125 then it makes sense to just go ahead and use Spring MVC. 29 00:01:23.125 --> 00:01:25.775 No need to pull in any other APIs, 30 00:01:25.775 --> 00:01:27.975 but you can do that if you want. 31 00:01:27.975 --> 00:01:29.783 They also have support from remoting here, 32 00:01:29.783 --> 00:01:32.849 so you can actually make use of web remoting, 33 00:01:32.849 --> 00:01:34.967 where you can have external clients 34 00:01:34.967 --> 00:01:37.672 make calls into the Spring container. 35 00:01:37.672 --> 00:01:38.932 Think of this like a way 36 00:01:38.932 --> 00:01:41.974 of doing remote procedure calls or RPC, 37 00:01:41.974 --> 00:01:44.074 or also doing distributed computed. 38 00:01:44.074 --> 00:01:47.741 So that's available also in this web module. 39 00:01:49.732 --> 00:01:50.716 Then moving down here, 40 00:01:50.716 --> 00:01:53.424 there's this other item here, Instrumentation. 41 00:01:53.424 --> 00:01:55.957 So basically, Spring has a lot of sophisticated, 42 00:01:55.957 --> 00:01:57.508 fancy technology behind the scenes, 43 00:01:57.508 --> 00:01:59.742 and so here, you can actually make use 44 00:01:59.742 --> 00:02:02.292 of class loader implementations 45 00:02:02.292 --> 00:02:04.743 to work with different apps service. 46 00:02:04.743 --> 00:02:07.217 For example, it can be used to create a Java agent, 47 00:02:07.217 --> 00:02:08.733 so you can remotely monitor 48 00:02:08.733 --> 00:02:12.257 and instrument your application using JMX. 49 00:02:12.257 --> 00:02:13.387 As a developer, 50 00:02:13.387 --> 00:02:15.630 you wouldn't normally build an agent yourself. 51 00:02:15.630 --> 00:02:16.708 You would simply use the agents 52 00:02:16.708 --> 00:02:20.625 provided by the Spring team or your app server vendor. 53 00:02:20.625 --> 00:02:21.567 But the nice thing about it 54 00:02:21.567 --> 00:02:22.717 is to know that behind the scenes, 55 00:02:22.717 --> 00:02:24.749 it's making use of some really cool technologies, 56 00:02:24.749 --> 00:02:28.243 such as AOP coding, bytecode manipulation, and so on. 57 00:02:28.243 --> 00:02:32.410 So that's what you get in the instrumentation model. 58 00:02:34.904 --> 00:02:37.324 Spring has support for test-driven development, 59 00:02:37.324 --> 00:02:39.199 so the framework includes mock objects 60 00:02:39.199 --> 00:02:42.924 for mocking out servlets, JNDI access, and so on. 61 00:02:42.924 --> 00:02:45.916 And you can do all of this outside of the container. 62 00:02:45.916 --> 00:02:47.766 You can also make use of integration test 63 00:02:47.766 --> 00:02:50.830 by creating an application context 64 00:02:50.830 --> 00:02:52.358 and wiring up your desired object. 65 00:02:52.358 --> 00:02:54.774 So testing is a first-class citizen here 66 00:02:54.774 --> 00:02:56.216 when making use of the Spring framework, 67 00:02:56.216 --> 00:03:00.341 so there's a lot of good support for it. 68 00:03:00.341 --> 00:03:01.174 So that's basically it. 69 00:03:01.174 --> 00:03:03.024 So that's a high-level discussion here 70 00:03:03.024 --> 00:03:04.682 of the Spring framework. 71 00:03:04.682 --> 00:03:06.908 In some of the following videos, we're gonna move forward 72 00:03:06.908 --> 00:03:07.924 and we're gonna focus on the work 73 00:03:07.924 --> 00:03:09.941 with the Spring Core container. 74 00:03:09.941 --> 00:03:13.017 We'll also make use of the Spring Web for doing Spring MVC. 75 00:03:13.017 --> 00:03:14.156 And then we'll also make use 76 00:03:14.156 --> 00:03:16.157 of Spring Data Access and Integration. 77 00:03:16.157 --> 00:03:17.191 So those are the key items 78 00:03:17.191 --> 00:03:20.244 that we'll take a look at in this course.