Hey, great work over those last few videos. 0:00 You now have three application layers, 0:03 and hopefully a working implementation of those layers for category. 0:05 We have plenty of work left to do in giflib, but 0:09 we should fire it up now to make sure we're on the right path. 0:11 With our interfaces and implementations for category DAO and 0:16 service in place, and with our auto wired service in the category controller, 0:19 let's fire up our application. 0:23 Now, I'm assuming that your database server is still running, and 0:25 you've already inserted a row into the category table. 0:29 If not, we'll insert a second row in just a moment. 0:32 With that said, I'm gonna go ahead and run my boot run task. 0:34 If your server is still running, go ahead and hit the Stop button and 0:38 then you can rerun the task and let's see what happens here. 0:42 To make sure that everything compiles successfully and 0:47 that the spring application boots successfully without exceptions. 0:50 Looks like my application did indeed start successfully. 0:55 So let's switch to the browser. 1:00 Let me refresh this categories view to see if I still get my one category to display. 1:04 When I refresh and looks like I still successfully 1:09 grab that category using my new service DAO pattern. 1:14 Now, how about we switch to that H2 web console and 1:18 see what happens if we insert another row into the category table. 1:21 So I will go back here. 1:25 And let's do insert into category (name, 1:26 colorcode), we'll insert the values. 1:31 I'll put Java, remember that's a string. 1:36 Don't forget the single quotes as well as the hexadecimal code for 1:38 this color or whatever color you like, 35986. 1:44 Let's insert that, we'll run that. 1:49 If you get this message that simply means that your session has expired and 1:53 all you have to do is log in again. 1:57 Of course, you're gonna have to run that query again. 1:59 insert into category (name, 2:02 colorcode) values). 2:07 Get my codes in their first ('Java' 2:11 #b35986, let's try that one more time. 2:15 Cool. 2:21 Update count is one which means my row was inserted. 2:22 Now, what should happen is that when I flip back here and refresh my page, 2:26 I should see both of those categories technology and Java. 2:30 There it is. 2:34 Now, you might be wondering why the colors are the same since we 2:36 definitely chose different color codes for these categories. 2:39 Well, it's all about how the HTML and CSS is coded in this case. 2:43 And for this particular piece, the color is specified in the time leaf template. 2:48 And just so that we don't go too far in this course before interacting with our 2:52 timely views, let's open that now to prove that we can make noticeable changes. 2:56 So I'll switch back to IntelliJ, and I'm going to open the category Index Template. 3:02 So under templates, and category, let's open that index template. 3:09 Now, if we scroll down here, you'll eventually see a div 3:14 with a static background color set in its style attribute. 3:19 Now, you may have learned the rule of keeping your styling in your CSS files and 3:25 out of your HTML if you've done any front-end work. 3:29 But as with any rule, there are certainly exceptions. 3:32 If there is user data that's used to add custom styling to a page, 3:35 such as is the case here with a user specified color, this may be one of 3:39 those few scenarios where it's common practice to place that within the HTML. 3:44 In this case, we can prefix the style attribute with th or like this. 3:49 So that timely for process this attribute. 3:54 And you sometime leave concatenation to combine the background color with this 3:56 category objects color code field value. 4:01 So to trigger concatenation, we can use the vertical bars or the pipe symbol. 4:06 And instead of this statically set code we can place this expression, 4:13 cat.colorcode. 4:18 Now, let's save this template and reboot our application. 4:22 So I'll stop this spring app. 4:26 Let me trash that output there. 4:29 And I will rerun the boot run task. 4:32 And give it a moment to compile and to boot. 4:36 And let's switch back to the browser and refresh so I'm back here and 4:42 I'm going to refresh. 4:46 All right. 4:49 Look at those colors, pretty cool. 4:50 We've now touched all the layers of the apple both in the MVC architecture 4:52 as well as within the service DAO pattern. 4:56 In the next stage, we'll add a whole bunch of features to our app, allowing our 4:59 users to interact with the underlying data via our nicely designed user interface. 5:03