Jakarta EE Tech Talks, 9 Jul 2020

Previous Meeting Next Meeting

⏯

youtube image

►

From YouTube: Jakarta EE vs. / or / and MicroProfile: A Developer's Perspective | Jakarta Tech Talk

Description

What is the relation between Jakarta EE / MicroProfile? Available runtimes, migrations and developer experience. What to choose when? How to start a project? A continuous coding show.

///GET SOCIAL!

Subscribe: https://www.youtube.com/user/EclipseFdn
Follow us on Twitter: https://twitter.com/JakartaEE
Like us on Facebook: https://www.facebook.com/JakartaEE/
Join us on LinkedIn: https://www.linkedin.com/groups/13597
Tag us: #JakartaEE
Want more great Eclipse Community webinars? Become a member of our Jakarta Tech Talks Meetup: https://www.meetup.com/jakartatechtalks

A

Hey everyone thanks so much for joining this week's Jakarta Tech Talk. Today we have Adam who's, gonna, be taking us through his presentation and I'll. Let you go ahead and get started at him, because I know you have a big one to go through so go ahead. Yeah welcome.

B

Back to everybody, so we made a deal with Vanessa and if you have a question she will interrupt me. So we can have a really truly interactive talk, and this is also what I like. Otherwise, it gets really really boring to the entire know online online stuff.

B

Whatever I will do today, I will publish this at github, Adam being ear hacks, and this will remain I, don't know a few days, so the entire code will be pushed here and the beautiful slides our either so I already get some criticism on Twitter, that I announced low slides and that not no slides, so I deleted actuality, reasonable slide and the only thing what I have is actually just marketing marketing slides about me and what I wanted to say is I have lots of fun with Java still and what new is a hex life?

B

There are virtual interactive workshops. The next one is, unfortunately about web standards, web components and JavaScript, but a one after that is Java again so would be relevant to you, and this is fun. So this is a hex TV and we already have a lots of questions. What this is is once a month, I answering all the technical questions and already saw there are lots of great questions like like system tests, Java applications, for instance, and I'm answered them once a month. You don't even have to register.

B

You only have you know to submit your question to adjust and I will read the questions and answer them with code without code, and we will even have an interactive code review this time first Monday of the month, so I think this is next week. Okay, cool- and this was the I actually forgot to do- to delete the slides, but forget is what you saw. This is the ad for my workshop, and this is the very last slide.

B

What new I created a meet-up ax group and what I, for instance, did IIIi announced this talk as well, because I think Vanessa forgot to announce that or the Jakarta tech I couldn't find the link to the talk so I did it by myself. Now this is announced twice, which is which is which is which is actually good. So now this were these lights. There was a beautiful slides.

B

You should appreciate a design, and you know the minimalism which I do with these lights and then okay kill that and now nothing can go wrong anymore because we have only code. So the idea is to talk about developer perspective from micro profile in Jakarta, I, guess, still, lots of interest and a good question now. What is what and so I can show you how I start a project so start set up, Jakarta e8 projects, and this was Jakarta Tech Talks jtt. This sounds actually great.

B

Almost like MQTT is jtt and I only need Java 11. So and now there is a jtt project. So if I open that with Visual Studio code, you will see in a second that it is. Actually there is a super pond, but a super poem is not that relevant. It comprises two other modules. There is one module here: jtt which points to with promix ml and by the way I. Don't we don't need parents? Why not?

B

Because we grown up now, we don't need parent proms here, because there is actually nothing to inherit so on what I have only here is the declaration to Jakarta ie8 and soon 9. Then micro profile 3 3, and this is the entire point of the of the session and actually I would like to start just with micro profile and see, know how far we can. We will come sorry, I, just the sorry, I, just deactivated that on purpose, so we only have micro, profit, 3, 3 Jupiter.

B

This is maven 5 and because of maven 5 I have to know, declare the both dependencies, which I really hate because it blots the entire pump. But even with these dependencies we only have 50 lines of code, which is great now just.

A

A question Adam came in somebody asked is that shell script public.

B

Yet, but soon so, if we do the setup Jakarta AE project- and we take a look- what happens here now?

B

It's public as you can see what I'm doing here, I'm using my own jakarta, essential archetype and it is actually published, but I think this sauna type negative, how it's called maven central it it takes a while until it is, it is visible. So it can be that this archetype version is not in the index but is published. So this is public.

B

So what my script is doing it just a nice of wrapper around maven archetype generate, and so the script is now public, more or less and if you say see for Jakarta edy, Jakarta EE essentials archetype. If you search for that, then you will hopefully find yeah this, and this is the repository and, as you can see, I published this version 22 days it goes or whatever and so great question. So if you try that at home it should work it's bit. Doesn't it means the maybes rental takes?

B

You know, 22 days to update the index for archetypes. Thank you so now yeah. So there should be no magic in the talk. So if you see, if you you know, see something strange, just please interrupt me and ask because this should be. You know no plugins. No, it's just you know just fun. Okay. Now we cover that and where is my ID?

B

Oh and the idea is this video code out of the box with Microsoft's Java support and it also comes with maven supports okay, so we have to save to plugins and we need them because of Java 5, and if we switch to system tests you will see this is actually new in this version of the archetype. Again we don't need a parent, so we just be the parent here and what's interesting here, I'm already using here, where is it yeah micro profile, rest client?

B

So the question is why that and what I do in this edition of the archetype is I'm using macro of a rest client to test the endpoint. So, as you can see, I'm using 8080, jtt resources and I'm using this pink resource client, which is just an interface and I, will have to clean it up. In one time and this interface just returns a response and invokes pink so.

A

um That's all, and because it is wait, a second where I am get ad GCM project.

B

Created git status and- and you should have it so if you clone it at home, you should have my cone write my code right now, so we have that now about service. So what I? What I would like to do? First I would like to start with open limiting. Why that because open Liberty, this is classic runtime and what I did I downloaded a version, and this is the stock version of open Liberty with just micro profile, 3 support.

B

So this is what I downloaded and the only thing I did is I allowed open, Liberty to omit matrix without authentication, so there's what one-liner, which I changed, but otherwise it is just this server without any modifications and before the talk, I actually believe that and reinstall that to be sure that there are no button, no modifications, ok now for I also use even less magic. It's a tool I brought two years ago, I think it's called what was inspired by JavaScript and what what does it basically watches changes in source main Java?

B

This is just a Java. It's a chart which watches the changes with the time in source main Java as well, in source tests Java and on any changes, just performs, maven clean package and copies the war to a predefined folder, and this basically it so ok. Now.

A

I, have it so I can.

B

Actually say, first start Liberty, and this is the version and hopefully.

A

Yeah now it started so we have here port, 90, 80 and then I.

B

Can run the watch and.

B

It should deploy the application and the jtt is deployed in 1:07 four seconds and now I can run.

A

With localhost 90.

B

80 and see whether this is working here, it is jtt resources and pink. It returns check out a micro profile. So this was the initial deployment of the entire thing. Okay, now fine so looks good wait. A second I need this. So now, let's try to perform the test. So I would like to switch to TST and.

A

Even test compile and.

B

What I would like to perform is failsafe and integration test. One of the questions of the upcoming ear, hacks TV, is why there are two modules. Why I'm not running the system test inside this module, and this would be actually easy easier, so I could actually copy and paste everything and put it here. It would be way easier, but it is not realistic in in real world what we always have. You have a micro service or even are a monolith with an external API, and you would like to test it from the outside.

B

So that's actually realistic, so you don't try now to to reduce some classes. You would like to have by a clean API and just test it as a black box. So therefore we have the system tests and the actual micro service and from the system tests without any dependencies. We are interacting with the micro service. What we can, for instance, do is. We can use all the st versions to test newer micro services and check whether the API is, for instance, backward compatible or not.

B

This is actually impossible with system tests inside so I answered our question from the upcoming xtv. So now this won't work because it assumes is 8080 and it should be 90 80. Okay, now we have it, try it and now it should work better. As you can already see it worked, so our system test was performed and the interesting part is now we using just micro profile without any Jakarta ie features. So okay, cool Oryx I mean this is not entirely true, because you know the common API.

B

Both both specifications are sharing so JSONP Jason, B, jax-rs CDI is part of Jakarta EE and Java e aid and became micro profile afterwards. So it's not entirely true, but right now, I don't have any dependency on Jakarta, okay. So now what I get out of that? So we can just implement it a little bit more. Let's say we have here a class.

A

This call is pink, and this pink has a public string message or just I, don't know in latency, let's say so, and that's all no more and then public pink in Latin, see and then say this latency equals that and see okay cool. So we have the pink and then the pink can be returned here, pink and return. The pink new pink with.

B

13 is the latency, and this should.

A

A

B

Should produce media type and.

A

Jason so now I have that so where's my terminal. So if I do the same, nothing happens because final reasons, this ah the.

B

Problem is I, have um what I forgot to do is what I could do is I? Could it should deactivate the automatic built here in in in Visual Studio code, because what happens right now, Visual Studio code deletes you know the war and my word says: where's my war.

A

And it says I cannot find that in this little bit. Sad about that. So, let's see.

B

Now we have to Jason so this was deleted. So now everything is fine, so we can say.

A

Now the pink can have not.

B

Only latency, rather than a name, I, don't know what that thing cannot have name but assume. Pings are personal, so we can give up in your name and.

A

With that we can say this name equals joke this.

B

Is DJ Carta Duke is called joke so.

A

Now we have the yeah, it looks actually good. So what's the problem for me, it looks like Java so arm, okay and then rerun what I think it even worked and then run the pink and you can see.

B

Joke so I'm great and now what we also get is actually we get the open, API, open, API and what OPA p.m. shows us that the pink is available here schema and because we have open TT. We can actually say here.

A

Localhost 90-80 and fetch the pink 90-80.

A

Open RP, / UI and we.

B

Get the interface and we can actually use the swaggy UI, which is no part of a micro profile. What's interesting, is we still if you take a look here at the Liberty, sorry at the ID, what my war is still 4k, so there is no frameworks, nothing so I still lean. Okay! Now, let's see when we will need a JB's or a GPS, Jakarta II, the first time so now, let's assume I would like to safety pins. So I.

A

Have now public voice public void and then stay say safe, pink.

A

Pink and pink and here just to the C so pink- and this is deep, pink and then post.

A

Okay, post and I have to use, consumes.

A

B

So and it will work, it actually works fine and by the way it is, it's really well integrated. So if I'd, for instance, I can add here open, API, annotations and specify, for instance, the name as just read-only and it will be considered in the in the in the user interface. So.

A

If I do something like what a second, if I, just reload, that you will see lettuce in name but if I say here, for instance, the schema, this is just read-only. We shouldn't open API, sorry.

B

A

A

Schema and inside the schema- and this comes should.

B

Come from open, API still.

A

No Jakarta, but if I go here and say read-only through and then redeployed entire redeployed, entire I think not no idea whether it actually worked so and then switch back to here it should it should.

B

B

Read-Only true latency name yeah, and this is true because here it disappeared. So this was wrong slot, so it cat it was there and here disappeared. So I can adjust the open API with annotations without any dependency on swagger, and it will do the right thing whose the swagger UI and open it here as well. Ok, now cool, we say nice, but actually what I would like to do is the following: I can and I would.

A

Like to and validate, and we need another check-in and saying.

A

Jason B is broken.

B

Okay, now what about validation so I could say this is valid. I can say, unfortunately, valid is not a part of micro profile, because a valid is bean validation and bean validations are part of Jakarta. So what I have to do right now is I will have to introduce the lost dependency. Where was it reintroduced dependency? And this is we need Jakarta again? So, let's do it so.

A

Now I have Jakarta II and now I.

B

Can use this valid.

A

Yeah now it's available think and I can say: okay now this is no more it only rather than this is size and the name should be between. Let's say two and two and.

A

B

Characters- let's do this so now. The interesting part is this thing will build, but liberty will ignore that, because right now, Liberty is is set up to only understand micro profile. I would have to activate the Jakarta ie8 feature. So, instead of doing this, what.

A

I would like to do is oh I. Could the wrong thing I would.

B

Like to start payara and.

A

My watch arm yeah with J Java 11 so was um no, you are not so Java is able.

B

To communicate now so anything see this JT T is already employed and with a little bit of luck, it should work as before, except except it is yeah. This is health and payara is up and running, and this was JT t, resources and pink, and we get latency 13 in Juke, and now the validation should also work and how to do that. I would like to copy this and.

A

Say I need ex post H content type and this is application, application, slice, Jason and then D is this and I hope.

A

Internal server, error and.

B

I know why? Because I always do it it wrong and the problem is and I'll show you the error message: I hope this is the problem and it will say somewhere requires not null. It would say that there is no default constructor. If you look closely so on, let's try to fix that. So this is Jason B and all classes like JP Ajax P. They need the default constructor. So I would like to use just the constructor public pink.

A

Just use that, and now it should work and I need the. What so, let's see so this builds. This is now deployed, looks good and my curl.

A

By the way, open API should also work. It.

B

Also works even there it only now there is a response from from from payara and what we had.

A

Was the strange curl curl this one so.

B

And now we get to 204 no content and just once and if I just do create when I put their name as too short, then I will get four bed requests and I could under on the server I could actually ask you, know forty four for the violations and could render differently sorry Vanessa yep.

A

Just another question: is it typical for other new web servers that they don't support, Jakarta out of the box or just open Liberty, and then do you need to configure Paora and what about JBoss.

B

So it is very fashionable to do to support a subset I, don't know why, but it is like it is, and the payara used right now it is the payara fish Community Edition, and if you, if you go and try to download the server there is, there is somewhere the Community Edition, and this is the full one. So the point is what I'm using is the largest possible payara and it comes with both. The same is true for my flight. So if, if we go to white fly arc and.

A

B

If you, this is the Wi-Fi 20 and if you just download the java, if full and web distribution this one, this is what I actually installed my machine. This one also has supports for both for Jakarta, EE and micro profile, and only try to do to show you know what happens if you just have micro profile- and this is not a common configuration at all in my world. I always use the full service and we have memory constraints whatever and a client would like to have a still. You know a runtime as possible.

B

Then we suggest open Liberty, Quercus or Haledon. For instance, then you get smaller footprints. Then then tom cat or jetty, so this is with with Jakarta alike, programming model. So it was not common, but there are lots of discussion, and you know all the vendors I even and not sure whether here, but um if you could go to Tommy, for instance, also great runtime, and we search for download, you will see, there's Tommy plume.

B

This is the Enterprise Edition with eclipse link, but you also see micro profiles, so you can just download the micro profile Edition. Why? Because community requests that other people believe that, if you just want with micro profile, is significantly smaller than the full, as you can see, this there's like 24, makes and download size difference, but I would argue. 24 max is not a lot perfect great question. Any other questions.

A

A

Follow-Up question related to wide how it goes to where to deploy.

B

Very good: this is simple because we have.

A

A

Just the answer so I have the.

B

Liberty, home Wi-Fi, home para home when Tommy home and it deploys to all service and for quark O's inhale it on I, don't need it so I'm using, for instance, Porco's death mode, but this is how what know so you can configure what are see in in D in your user home folder, and then it deploys everywhere exactly okay, the problem with what is you Saudi warnings is recently I found out that it uses them maven and better.

B

So this is like maven project, and this throws warning whose JDK 11 so I already thinking you know, dropping the maven embedded in programming, something by myself, but right now it just depends on Java as II. What end on on on the maven embedded project, which is I, think, has some problems with extreme drone thought Forks or whatever so, but I don't need it. So I'm thinking about you know, dropping dependency. So no dependencies is always a good idea.

B

Very good, I hope you are satisfied with the answer with what and now you saw what what what what happened was. We were first actually the very first time to use a Jakarta API and what I could use. Of course, I could go to bean validation, bean validation and search for the API and we'll find somewhere.

B

Yes, he been validation, basic, let's see what mr. Belding is saying and so I will have to add this to my poem and then I can skip the implementation, because I only need this so the server and now what about WebSockets WebSocket is also not a part of a micro profile, so I will have to add another API called WebSockets and and then sometimes we need shallots. So what about circuits, for instance, for more fish and uploads or or and then I will need to add a solid API?

B

So therefore, my solution is actually always at both dependencies, because it's, the easiest I, can clearly remember this Jakarta platform in Jakarta, ee and then micro profile is both dependencies and this is not like I'm adding load and just these are provided dependencies, so I'm just using them for compile from compiling the stuff, okay, nice. So what we have right now we have the Jason with open API. We have jax-rs and I, showed you DDT, open, API and now, let's, let's.

A

Do something from.

B

Yeah, a little bit more cloud native to show you some some possibilities with if you, if you have both in one place by the way, also an interesting parts ejbs, they are still useful, because what you can do with egypt is easier than it was plain CDI with each of these, you can do, for instance, like startup.

A

Service, let's say startup service for Java, and this and what I can do is I can tell.

B

This is a Jakarta EJB or Java EE EJB, and this.

A

Is a singleton and this is a startup singleton and then I can say public methods in it on start, and this is post.

B

Construct and by the way this post construct, the annotation is shared between Jakarta in micro profile, is called common annotations and then go this with systrace, and you should see that this is actually working. So where.

A

Is my ward what go so this is not deployed and.

B

We see here a startup service in it and start it is already working so without a GPS. So I would just show you this.

A

Kit status and then get ant GCM. Then it was an kit. Sorry EJB stood up, EJB, startup single talk, ok, cool.

B

Now you have it so with all the jeebies. It is like this. Let's, let me think it has to be application. Scoped, application, scoped and.

A

Then post construct you have to do observes.

A

Observes for sure no more post construct and then initialized.

A

Application, scoped application, scoped dot class and then object. I other does and doesn't matter because no one would.

B

Like to have this just the event which doesn't matter- and this has to surf there, similar apple, so this has to have a similar similar effect, let's go it with CDI and it should also start. This is the pure istic micro profile solution because only relies on CDI. So this is the CDI alternative. Let's see whether it actually working so and now, yeah CDI startup service in Eden start. So you can say: okay without the jeebies. We can achieve similar. Something similar, but I have to think about this.

B

More is this, for me is not, as you know, natural as just saying, startup singleton, which is more natural than observes initialized applications, coped and sometimes I always use this class, which is actually brung I'm, have to observe the application scoped. So this is like the purest Akmal profile solution, so I get at.

A

Gcm and say purest, ik, CDI, heuristics, CDI experience would say.

B

A

B

Identical but yeah, this is just to show you what the differences are. So now we have that so the next one is, of course, if I would like to implement a WebSocket. So there is no WebSocket in micro profile. I will need Jakarta and I will call.

A

It, let's say not: Jakarta or tech tag talks, notifications, Java and now we have Jakarta II. So what we can say is I think it's server, endpoint, yes and I'm.

B

Never sure questions.

A

Yes, somebody equals git commit and message is that what that is? Oh.

A

Yeah is that an alias, basically forget commit and message yeah.

B

And they said this comes with Z shell, so there is. It comes with C shell and it yeah, but it is. But it's not for me it is just part of Z shell. Thank you, perfect you're, a heckuva, nice, alright, honey! You are a hacker, true hacker: what yeah part-time, part-time hacker, very good service servant? Just you know, added during the tech talks right you are the ABAP uber hecka. So that's.

A

Unconnect- and this is oh so what I forget on.

B

Open and what I get past is this session from the WebSocket session and.

A

Just to the Swiss trace and then add the session so now I can remember this session and then oh I can use that.

B

Now and of course, there's on message so.

A

I can use the on message as well methods on message and I get the message here and this.

B

Is on message, the point is: what I showed you right now? It is a part of Jakarta e, now mixed up with CDI, so it can use this application scoped, for instance, and now I can use the WebSocket otherwise I couldn't use WebSockets, because what took us another part of micro profit. Of course, what I could do? I could activate a feature and open Liberty just to act. You know to activate the WebSocket functionality. The problem I have with all the activations and picking the right. Api is at the end of the day.

B

You will create your own unique snowflake, so your server will be completely different to all the other service. And if you, if you are in trouble, you will have to to fix the problem by yourself or try to find another project which which is similarly configured to yours and solution.

B

What I'm doing I'm, always using powerful white fly fool or open Liberty fool with all activated features: I measure, the performance, overhead, I measure, these the memory overhead and if it's fine and it's actually great, because if I move to our the client or we just have to migrate to other server, we just drop. This server pick another one and we are ready to go.

B

So this is my approach to to the projects, basically, ok, so on, and if we received a message, we could send the message back as echo the message- and this would work with. Actually we can but end.

A

Then this optional off, we can have an optional here and here as well, optional of type session and then.

A

Chav option and then say this session.

A

If present or no map first- and we need a session I think this is.

A

Get a thing remote and then for that I think this is sent.

A

If present and then we have to.

A

Forget the methods I think it's send text or something and I will have to do a.

B

Go with the consumer, so what here is the remote and I will have to do something.

A

Like send text send text and the message, so this would look like this, so this is how to send to send the.

B

To us to send messages back and message with a pink.

A

I would say echo back so.

B

Now, if they will be, if we in case we will have sometimes there are no questions left, we can implement the JavaScript client for that, but this should actually work and now with another thing, is: if I switch from application scope to singleton.

A

And now go, we start up as well start up again.

B

So we know that it is actually going then I could just say.

A

I would like to have a method, and this is like schedule and then I would like to say. This is every minute every minute.

A

Every other, second, let's say, and every hour I would like to send, send pink to all listeners this session, and this is actually exactly the same code and.

A

B

Message so what I would like to do is instead of echo I, would send think.

A

To all connected listeners with plus local day time, dot, not something like this. Okay, no looks good and then systrace and.

A

B

Vanessa will ask what this new Java syntax I just quickly corrected that so no we.

A

Have it so Tech Talks send pink, we have and just adds. You know some.

B

Counter, okay, so what's the situation here.

A

A

And what we have here, we have here- HIV exception. It says null pointer in send pink tex texture.

B

Beautification 3737.

A

This session map this session, no one said that right, so what we have to do is post construct now post construct and then it and then this session equals optional and what was the name empty exactly so now again.

A

The timer backed off so and what.

B

We have sent pink, we see, we have a timer and there is actually and no equivalent in micro profit for now for timers. So what I will have to do is create. My own town is at a timer. It's another big deal, but, from my perspective, is a way easier, just to use a start-up singleton with a single annotation and in case we get a runtime which does not support Jakarta II, for instance, Quercus in case of quark owes it comes with proprietary schedules, which is Kron based, which is fine.

B

Sir I could actually migrate that that, in seconds from a GPS to let's say a corpus, and if there is a micro profile, a runtime without schedules, what I? What you could do is you could use, for instance, executor service and create your own repeatable tasks, but you will have to create it from scratch or you will have to depend on an external library or framework. Ok, so.

A

Now I would like to check it in.

B

Ejb schedules are are useful.

B

Ok, so now the interesting part is this: is.

A

B

Is hard to see now how much messages are actually sent so what we, what we could do is we could actually create here a sum or add some metrics to add some more visibility. What's going on inside all all these methods, so.

A

B

Let's see what we can do very.

A

B

So could be fun, wait a second if present or else.

A

So, on what I'm thinking about for about a.

B

Small refactoring, so what I could do is I could actually create a method called sent with.

A

A text and what I need is T remote, and this is the this async remote, and this is.

B

Just a thing, so what I'm thinking about I could just send a text here from that and.

A

And in case the session is students, so in case this session is not not so send text.

A

Text- okay, so and now.

A

Okay looks good so, and so now I can just use it here.

A

This is hello world and.

A

B

What I need here, and if else and I'm struggling you know to make it destroy the the optional and what I wanted to show. You is what I wanted to count it. How often it sends messages or attempt you know to sends messages. Also, there is no no listener, and for that, let's keep that and it's no time or I, wouldn't I wouldn't be satisfied with the solution. I wanted to show you right now, so what I just wanted to show you instead is the following.

B

What we can do I can just inject, for instance, something from micro profile which becomes useful in Jakarta II. Now this is actually the thinking here, and this is a registry type I always confuse this and I will have to import it first and then use here the application and what I get here is the metric registry registry so- and this is very useful, because now what I can do is I can just say.

A

Here I am interesting in registry counter, and this is like.

A

Send a life message and this would be Inc, and here, let's assume I would like to send.

A

And this is not alive rather than this is just.

A

Or broadcasting so broadcasting not polling rather than broadcasting to.

B

Listeners- and this is how many messages are actually sent, so the cool story is hopefully so. If we yeah looks good, let's see so, if I will just deploy it again, payara will we deployed sent I think hopefully now.

A

It happened so it sends the pink so and if I go here and say, Curl Curl, localhost.

A

Localhost:8080, slash matrix matrix application and you can see.

B

As that send message, total 22 and we also send 22 messages, which is not true, but let's assume and usually it would be two different different different, a state of the counters, because I would pull more often than send messages. And then we see you know. I have get some insight what's actually going on inside the application and of course, I could use a counted annotation, but with the counter validation, I couldn't have here the if-else which which I don't like now to implement. So this is like business matrix very important, so it.

A

An't UCM business counters from MP in Jakarta.

B

Well, that's a very important question: how much time time do we still have? How long are the tech talks, because I have more and more ideas? Sorry, they.

A

Are typically an hour, so you have about 14 minutes left. But if you go.

B

A

Bit I don't mind sticking around.

B

Okay, so the ID, the audience should have, should ask questions otherwise we'll stop in 15 minutes. So we.

A

Just got another question, actually very good. Oh and metrics are actually part of you profile. Are they.

B

What is my profile.

A

You just said n matrix.

B

The Audi matrix yeah, the metrics, are part of micro profile, matrix API, so this metric registry is part of the micro profile and what I can also do I can, for instance, say I'm interested in the performance of this method and I.

A

Can say times and without this and I get.

A

The performance of the thing so.

B

A

Pink but I will have to redeploy and now, let's see what happens so.

B

If I do this, oh, if I.

A

Do this I get a Duke, and here I.

B

See also the performance of the pink research method, so it was invoked once and this matrix are micro profile matrix, but this trench format is Prometheus format, which is part of the of the foundation. The with our entire war, with all the stuff is still seven case, there's actually no difference whether I'm using Jakarta or micro profile. Of course, the payara is able to provide everything, but we can actually now let's try. This I could actually kill Pyle right now and say cool. So then it should of course stop.

B

So there is no paella and then.

A

Just do this reinstall.

B

A

B

I and reinstalls everything from scratch and now I can run, and then this script is trivial by the way right. What it does is reinstall white, why it's not part of the distribution, but this is dead, reveals that it actually did. That's all. It removes Wi-Fi home and unzips white flag so that that's all so there is there's absolutely no magic, so I'm, okay and now I can start a white flight.

A

Another question somebody would like to see the JavaScript client for the WebSocket, how.

B

Cool okay, so hopefully I can deliver I hope. You know the audience will forget that, but now, okay, so.

A

B

Ghost afloat once again, and then let's see what happens here. Oh this is now response from white flight and if you take a look, this is white.

A

B

Get the metrics not yet from white fly, and we see this is the EGP time and from white flight, and this is the white fry fooled. The recent edition the same story exactly the same behavior and by the way open liberty would be exactly the same as well. The only thing what I did is I just using an open Liberty to micro profile edition. You know to explain your things, but usually I use everything. So um this is that and now the question about the WebSocket client?

B

Okay, oh okay, great! So we have web app here. What I think? Second, what I will need to do is I need at least an index.html, so.

A

Wait a second I need here, index.html so and let's see, I need HTML with head and body, and here head at.

B

Least title hello.

A

Jay tick, tock, tick, tock, and here we need the saij one, hello, Jakarta te and MP.

B

So if I see this on screen, it will work, otherwise it will work. I will I can proceed with JavaScript. So, let's see I will have to redeploy that again.

A

And then ask for a.

B

A

J TT j, TT / it works. Okay, then we can go ahead. So then I will have to add a javascript file and call it rocket GS, and what I also need is here.

A

B

A

I also need here is.

A

B

Source and the source is going to be dark ages and the zurka GS. We need at least console.log.

A

B

So we have that, let's see what happens so if I switch to firefox and ask for localhost 8080 j TT j TT and go to developer tools, I hope we will see.

A

Something no I always forget that we have to deployed it and then reload.

B

This okay, it works so now, let's try to show you how this works of. Fortunately, we can do socket.

A

Equals new web.

B

Socket and the URI is going to be web.

A

Sockets localhost 8080.

B

/, j, TT / without resources- I hope- and this is notifications- so it is going straight to notifications, notifications.

A

Then we need here's orchids dot on open and we can register a handler console block, opening a circuit with the event and then I can actually send message, and this.

B

Could be too early because yeah right after yeah, it's C, because what can happen is o.

A

Window said, timeout, shut interval and the first thing is lambda, like in Java, I can say, socket, dot sent hello from Jas and in jazz. We have as beautiful.

B

Date as in Java and I think I hope. The second parameter is the actual timeout I, always.

A

Confuse the parameter order, but I hope this is right, so said. First.

B

Is handler and then it's timeout handler timeout looks good okay and then we need socket. Oh, we.

A

Need saw cat on message and the message is e console.log and then echo as a message back from server, and this is the message so.

B

With a little bit of luck, it could work so, let's, let's see whether it works so just to deploy.

A

That should be available on white fly, yeah it sends pings and now I will reload that and it works. So I get back hello world from.

B

A

So I it I get the notifications.

B

A

B

Can see data had a world, so we get message. I have to do it. Oh can I. Do it larger, Hodgman yeah. So we get the message back from server with the message and in JavaScript I can actually used, structuring and use that.

A

So what it means is, we can actually do the following.

B

A

So this is the key functionality yeah with data just lifted structuring, and then we should see the data. Ok.

B

This it it actually works, but it works because of jacquard a service, a micro profile. We would need a third party library or part of micro profile. That's the point actually so.

A

Yeah now, let's see.

B

So see now you see only the message, so it's working so we have the Central European Time. This is and hello from Jas and so forth. So this is the communication on the server. Do we have any other questions.

A

We sure do: is it possible to build a multi-tenant, Jakarta ee8, slash micro profile web app so that each child has its own database? How do you switch between different databases, schemas for each HTTP request for.

B

Each HTTP yeah it's absolutely possible and actually only possible with Jakarta, because micro profile has no notion of persistence for now and what we did. So it depends whether you would like to use JP or not, but let's assume you would like to use JP a so you can. Actually, what you will need to know is upfront, of course, the number of databases. So let's say you have five databases and five clients. Then you can prepare five persistence units and then so what usually happens is you?

B

Can we actually did it in one project instead of doing.

A

Something like and before we do, this.

A

So and then what.

B

We can do is persistence context, so we can do the inject entitymanager, but what you can also do you can inject the entity manager factory and then on demand. You know just fetch the right entity manager and with CDI you can even produce an entity manager which depends on something which is stored in the request, for instance, JSON web token, another great micro profile API, so we could actually implement something which looks into JSON web token and, depending on the token switches between current entity manager, implementation.

B

Having said that, what we always did, we never produced entity managers on the fly. What we did this in a stand-up singleton or somewhere we injected all the entity managers we knew and then switch between them with. You know just a switch case, because we never had hundreds of databases with more. We had, like a view, databases, but if you are searching for a generic solution, this would be also also possible.

B

The problem, of course, is you will have to know to set up the credential to the back-end database and an JDBC connections on the flight. Anyway, it's a classic xtv question. This is what we actually do once a month. I hope you are happy with the explanation. So any other questions.

A

No other questions right now.

B

So we are 6 p.m. so. If you have no questions we actually done, but what I wanted to show you actually so the whole discussion, Jakarta a versus micro profile, is actually pointless. What you should do is you should write, you know a simple code as possible and and and you can even start with both and just you know, use whatever you need to use and in one point, if you will have to migrate, you know to two Quercus or harried on something which does not support jakarta ii, so you will always find a solution.

B

For instance, you can replace singleton with application scope. If you have at stateless, you could replace that with request scope, so it will behave. Similarly, it's not like this is complete different behavior, and so the last thing, probably what I would like to show you this, how it behaves in Dhaka?

B

This is I at the beginning of Dhaka always show this, because it's a okay Jakarta do not write, do not run in containers, so we have a glassfish, which is a little bit outdated diversion here, but I could still, for instance, use payara here and now. I would like to build the application and for that I will switch to this jtt and say.

A

May even clean, install and then docker built tea and call it Jakarta, Tech, Talks and dot so and with that.

B

It should actually create the docker file, which is true, and now, if we take a look at the Jakarta TT docker history with the right name, we will actually see that this Jakarta was. This image was created two months ago, the payara image and the Centaurs image. Ninth nine months ago and thirteen seconds ago, I created the uppermost layer which actually only this upper layer will will be pushed to the clouds. All other layers are immutable and the size is 8 K, so the entire applications, 8k and everything else are roughly 500 case.

B

I would say 500 max, but we only have to ship it to the cloud in case the server changes. So all the clouds have private registries and there is no difference actually and and the modern runtimes like Quercus or halide own. They also separate that, but they do it with with jars. So we have one jar which contains the business logic and all other jars are the infrastructure. From the beginning, the modern runtimes like hell, Eden or Quercus. They also separate us exactly what Jakarta Iran times are doing as well, so cool.

B

So we used to today payara full whitefly, full, open, Liberty, micro profile and I hope you got an insight. You know how to combine both API is what I skipped a little bit. You know the micro pave goodness, but we can repeat it in future and if you're interested in JavaScript and July 9th I think no I think I know.

A

Is a hex life and this.

B

Is we hack all together without any dependencies, a JavaScript application with web component without any frameworks? This is what I'm also doing in commercial projects and yeah. That's all so any questions left so I will just stop this committing push. Yeah I will commit and push of course,.

B

Vanessa, do you have any questions? Because we have a lazy audience today, I.

A

Don't have any questions, but I would like to say thank you so much. This is awesome. I think I learned something and I'm ready to be a hacker. Now someone.

B

Asked me out of magic in HTML. This is just built in video codes. You've asked me know was what was the automatic magic text expansion in HTML? This is video code standard behavior, so this.

A

Is nothing new, perfect and yeah awesome? Well, thank you so much and to everybody who watched today, the the stream will be available through this link in the next, like 10 minutes and it'll also be on the jakarta ee youtube channel by early next week. So keep an eye out for that cool and.

B

Everything is not in github in the axe. Folder I will delete it in the next few days. So if you, if you just clone it and then it will disappear great.

A

Thank you so much. Thank you. Bye, bye,.