Jakarta EE JakartaOne Livestream 2020, 9 Dec 2020

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From YouTube: Studio Jakarta EE: Namespace | JakartaOne Livestream 2020

Description

Ivar Grimstad explains Namespace in this break session at JakartaOne Livestream 2020

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Okay, I think we're live so welcome to this session on the namespace change. What I'm going to do here is entirely in code and I'll do the namespace switch and it's an entire application. Here I have a a rest, endpoint and- uh and this resident boys are using an an ejb to find a greeting. This uh hiv is then again uh using a jpa repository where I uh do um do a quick criteria, query to the database and and get the result and display it.

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I also have a cdi extension here to uh do a log message uh when it's um going live.

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So it's a lot of things happening here and and the reason for it is that uh here's, the message that cdi extension is doing so I'm going to uh redeploy this application very quickly and- and you can follow in the log here when it does this- is that uh it will write things uh in in the blog from this hi there you see, so the cdi extension is a hooking to to checks for this uh duke's annotation, uh which is something a customer. I made just to show an example.

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So so the application is super simple I'll go in here and execute it. So it it's called complete duke and it has a hello world and it says uh how did you carry it and and the jacari message is uh coming from the database.

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So so let me just go in there and do uh this query and you can see I I have the message: how did you correlate uh from the database?

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So let's go and change uh this one to a jakarta, e9 application- and the first thing I have to do then, is to go in here and change from eight to nine uh and then I'll I'll update my uh references in the id by reloading this maven palm and as soon as this has been uh uploaded, you'll see I'm starting to get completion errors and that is totally accepted.

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So the first thing I have to do after updating to uh jakarti is to fix the compilation, errors and you can see it's all the javax uh imports. So let's do this manually here and- and you can see you have to do a little bit careful. So you choose the right.

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One just go through all the classes here and check for these uh completion errors, and you can see that it's the javax namespace and the ide is helping me here to figure out that the jakarta current version, so so here make sure you choose the the correct one. Here is the cdi extension. So it's the cdi uh extension there uh and and just go through uh all of them and and fix the imports here. It resolved all of them to the jakarta persistence for the repository, and you see it.

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It's not necessarily all java x dependencies. You have to change it's it's all the jakarta specific one there are. There are a couple of ones that are still in in the uh sdk, so so you can can use these so so be careful that you don't replace uh javax with jakarta everywhere, then you probably will get some problems as well.

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Here it produces is another one because you don't want a cdi producer in this case, it's a it's producing application json and here I go through the application uh entirely and and the uh jexuras application annotation here also so there I've fixed all the uh imports, and you would think since we've been talking so much about the namespace and all these import statements that I'm done now.

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But that's not the case. There is more and what do we have more well think about the xml files. These have name spaces as well, so so what we need to do here is to change to the uh jakarta namespace and it's pretty simple.

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You replace the xmlnsjb.org with the https version of jakarta, ee, xml, namespace and the same thing here.

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So, of course you can do this uh by search and replace and and uh and and fix it I'll just do it manually here and to show it for you and be aware of the versions, and I I think I also need to change the actual name here. No, that's! Okay! This one is fine scheme location.

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This one it's about dated.

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Yes, sorry jakarta, so we put everything here in in jakarta, ee, xml and and also the the version of the schema, and this is persistent xml, but there are more schemas and you can find them all. Just by going to jakarta.e, schemas and- and here you will have a complete list of all the uh name sources involved and the jakarta e9 name switches as you can find here. So you have the the updated version of all of them here and and um and and as you saw, the one I did.

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Some changes uh I was using here was the um persistence one.

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So so uh here's um that has some some different uh uh here. You have the persistence, name choices, so so you you, you can find all the xml files here and and make sure that you make the proper changes you can copy it from here. If you like, so are we done now?

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Well, we've done the the java code. We've done the xml namespaces, but look at these properties.

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So if you have properties that are prefixed, you need to fix those as well so go through the properties and and make sure that all these are are okay, so we're getting there it's closer, but uh there's also one thing: if you remember the cdi extension I I was using that is defined here in this marker file, and this marker file has the name javax enterprise inject.

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So here I have to actually rename the file to the jakarta counterpart.

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So it's a lot a lot of things to to remember here. So now change this one to jakarta, and so so what I've done is to fix all the imports.

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I've gone through the persistence, the xml file, if I have other web, xml or or other beams, xml or etc. I need to change this, those as well. I fixed the namespaces, and uh this is just before the because the catalog isn't uh really updated here or maybe I've written something wrong. Let's just check now it should be fine, so I have the um in the next cases.

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The property is the marker files and I think I'm pretty much done so then I can deploy it not to a jacari 8 runtime anymore, but a jakarta e9 and I have glassfish rc2 here so I'll just add the artifact to this uh application and then, let's see if it will run I'm a little bit worried about the that I had this error in the namespace, but I I think it it has to do with um uh the catalog isn't updated yet. So, let's um uh look at this, I haven't missed a slash.

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Let me see it's good to have people here, slash to curry.

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Yes, thank you very much what you, what you should do without the help from the audience and obviously everything is green. Nice. Thank you and uh then let's uh it's http. I think it's hps now so let's redeploy it and while it redeploys, uh we can also look for the cdi extension and see if it works here- and you can see here, it says hi there right. So the the cd extension works with the jakarta name and let's have a look at the application.

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So go back here to the glassfish. You can see it. It is the uh version six and go to the uh complete duke uh hello, and it says, oh my, it says hello to jicari8. Well, we gotta fix that as well. So you see it's not enough to just look at your code. You need to look at your data as well, because it may be that you have some.

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uh Let me see if I can find the database thingy. Oh my god, where is it.

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Let me see if I can find oh sorry about this.

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I think I had it somewhere kind of the uh screen her screws up for me.

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hmm There we go so, let's open it up, oh there we go and uh to a gray console deselect from great thing. There you go and you can see here it. It says. How did you create so do remember that you may have some dynamic things.

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You may have some class names here or or class paths or or something so you may need to to update this stuff in your database in order to have your application to uh work properly as well, and now it says hello to jakarta, e9 and I'll actually do one more update and that is uh do hashtag, embrace jakarta, tweet.

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Let me see tweet embrace jakarta, and uh that is my message for today when you've done, the changes do tweet, embrace, jakarta and we'll make you notified.

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So that was pretty quick and I think we are almost out of time. So I hope you could follow this and um the next session will be uh sebastian dashner uh doing some live coding and testing with joy. So please do uh enjoy that session and I'll see you again here.

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And, of course, all this code is available on uh my github and you can find it there I'll see. If I can quickly, you can find it on on github, so it's called complete, duke and um it has even has a tutorial. You can try it from from beginning to.

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