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PlanetNetbeans
Planet NetBeans is an aggregation of NetBeans related musings from all over the Blogosphere.
Adam Bien - August 13, 2018 10:04 AM
How To Find Default Configuration (e.g. -Xmx, -Xms) Settings (ergonomics) for JVM?

JVM comes with "ergonomics" feature which tries to find the best possible JVM configuration for the execution environment.

The configuration choices suggested by JVM can be printed with:

java -XX:+PrintFlagsFinal

A fraction of the output for Java 8:


uintx MaxHeapSize                              := 4294967296                          {product}   
uintx InitialHeapSize                          := 268435456                           {product}
bool UseG1GC                                   = false                               {product}
(...)
See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - August 09, 2018 03:51 AM
From RX over Cloud Languages to Rate Limiting -- 53rd airhacks.tv

"Rx Use Cases, Languages for Blockchain and Cloud, Faster Deployments, PDF Generation, Rate Limiting / Throttling, Schedulers, Injection, Frontend Packaging, Injection vs. EJB, Authentication, Programmatic Timers, Scheduler, Microservices and Distributed Transactions, Complex Object Serialization (topics and questions)", or 53rd airhacks.tv:

Any questions left? Ask now: https://gist.github.com/AdamBien/b5b1a591d2ffe03c7e921d60f0afbd9d#file-54thairhacksq-a-md and get the answers at the next airhacks.tv.

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - August 08, 2018 03:54 AM
Transpiling Modern JavaScript For Older Browsers Without Configuration

Modern JavaScript needs to be transpiled down to "legacy" syntax including polyfills in order to run on non-evergreen, legacy browsers.

In this screencast I'm implementing a sample ES 6 application with modules and transpiling the code into "legacy" JavaScript without any additional configuration:

See you at Single Page Applications (SPAs) -- the "no frameworks, no migrations" approach, at Munich Airport, Terminal 2 or webstandards.training (online).


Real World Java EE Workshops [Airport Munich]>

Adam Bien - August 07, 2018 04:55 AM
From Java EE over EE4j to Jakarta EE--airhacks.fm podcast

An airhacks.fm podcast conversation with Mike Milinkovich @mmilinkov, about Cobol, APL, Smalltalk, Visual Age for Java, WebGain, TopLink, "The Object People". Canadians run the Java World, Eclipse, plugins and OSGi, pragmatic modularization, the First Executive Eclipse Director, Mark's Cavage role in opensourcing Java EE ee4j name confusion, the Jakarta EE brand and logo, the migration from Java EE to Jakarta EE, why it is not possible to rename ee4j to Jakarta EE, working 50% on Jakarta EE, working with Oracle lawyers, why not all JSR specs can not be contributed by Oracle, dealing with old specifications, how to contribute to Jakarta EE project, how to become a Jakarta EE committer, the difference between Eclipse Foundation agreements and other foundations, becoming an Eclipse member, becoming a member steering committee, hacking the Jakarta EE process by becoming a member without paying money, the Jakarta EE release cadence, different cadences between ee4j and Jakarta EE, who decides what at Jakarta EE / Eclipse, specs become opensource projects, committer based merocracy, how to start a new Jakarta EE subproject, Jakarta EE is "code first", Microsoft joins Jakarta EE, the dangers of profiles, no politics, the specification Jakarta EE committee decides about profiles.

Subscribe to airhacks.fm podcast via: RSS iTunes See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - August 06, 2018 08:44 AM
Rx Use Cases, Languages for Blockchain and Cloud, Faster Deployments, PDF Generation, Rate Limiting / Throttling, Schedulers, Injection, Frontend Packaging -- or Questions for 53rd airhacks.tv

Topics and questions for the 53rd airhacks.tv:

  1. How to organize code with BCE and JAX-RS microservices and shared entities?
  2. How to improve deployment / development cycle times from 40s to (...)?
  3. PDF generation with and without Java EE
  4. How to implement throttling / rate limiting?
  5. Choosing the right language for decentralized cloud storage network
  6. Java vs. Scala vs C++, vs. Go for blockchain implementations
  7. The ideal use case for reactive extensions
  8. How does RxJava help in CRUD applications?
  9. How do you approach authentication and session handling for this type of application where the front-end and back-end is split into two separate projects? [blog comment]
  10. Are you using anything from Java EE Security or Microprofile JWT auth? [blog comment]
  11. How do you package and deploy the front-end? As a WAR? [blog comment]
  12. Can you please elaborate on your explanation of @Inject vs @EJB? [blog comment]
  13. I would like to know how can I control transaction throught microservices [blog comment]
  14. Is there any mechanism to feed the schedule data programmatically? [blog comment]
  15. How can I conveniently map more complex object, like typical business objects, (containing other objects) with the use of your no-library approach? [blog comment]

Ask questions during the show via twitter mentioning me: http://twitter.com/AdamBien (@AdamBien) or using the hashtag: #airhacks. You can join the Q&A session live each first Monday of month, 6 P.M at airhacks.tv or http://www.ustream.tv/channel/adambien

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - August 06, 2018 06:13 AM
What is an Evergreen Browser?

The term "evergreen" refers to the release strategy. Evergreen browsers are updated frequently (Microsoft Edge Changelog, Firefox Release Calendar, Chrome Release Schedule) in background, constantly updating their compliance with Web Standards and also adding proprietary features.

The version of an evergreen browser (e.g. Microsoft Edge) lost its importance, because an evergreen browser is expected to run on the most recent version.

See you at Single Page Applications (SPAs) -- the "no frameworks, no migrations" approach, at Munich Airport, Terminal 2 or webstandards.training (online).


Real World Java EE Workshops [Airport Munich]>

APIDesign - Blogs - August 02, 2018 07:11 AM
Never hold a lock when calling a foreign code!

Fighting with deadlocks is hard in normal code. In case of APIs it is even harder. Yet, the advice is simple Never hold a lock when calling a foreign code. See the typical example rewritten to be deadlock-free in the dedicated deadlock page.

--JaroslavTulach 07:11, 2 August 2018 (UTC)

APIDesign - Blogs - July 29, 2018 06:36 AM
TenYears of the Practical API Design book

Ten years ago, on July 29, 2008, the Practical API Design book was published. Isn't that a date to remember and celebrate? Yeah, it certainly deserves at least a little note. Many things has changed over the last ten years...

The language that I used for most of the examples, Java, is no longer as popular as it used to be. It is no longer taught at basic university courses. It is no longer the choice of those who want to use good technology with all its three essential components (coolness, time to market and Cost of Ownership). Does that mean TheAPIBook content is no longer valid? Not that all! I always expected Java to evolve into something different - the language was just a tool - thus the core ideas still remain fresh and useful.

REST has grown way stronger in the last decade. When TheAPIBook was written, the term API was still reserved to all types of API (Protocols, FilesLayout, Dependencies, CLI, and of course signatures). The REST was just one of the types. I realized things has changed in 2014 when I received a question: How does the API economy impact the APIDesign? At that moment it was clear, the term API had been kidnapped by the REST guys. When regular people hear API they first and foremost envision web services! That is upside down, as network communication is just a part of the Art of Building Modern Software, but the expectations have shifted and one has to live with that.

Types went away and returned back. For a while it seemed that types were heading to unimportance with the decline of Java. It is true that the runtime characteristics of dynamic languages like JavaScript got on par over the years. Yet, it seems the types are striking back: TypeScript, Kotlin, etc. show that for certain tasks (like designing an API) having a type is an advantage. While I am able to design an API in a dynamic language, having types makes it all more convenient and alike to advises described in TheAPIBook.

I left the source of inspiration of TheAPIBook - I only contribute to the NetBeans Apache project in my spare time - as a result I had to find another organization to feed me with APIDesign mistakes. It is a strong suply, yet I believe the list of my achievements in the recent years allows one conclusion: It is possible to design an API as a service! I wish the impact of the Practical API Design book has been bigger: It is clear there is a lot of people struggling to design an API and it would really help them to avoid inventing the wheel. Many of the Practical API Design observations would help to avoid the mistakes I am seeing all around, but maybe it is not that easy to read, maybe it is the personalization that counts!

Don't you need a skilled API designer? Don't you want to improve your API Design skills with an entertaining game-like training? Talkback to me. Actively joining would be the best celebration of the 10th anniversary of the Practical API Design book!

--JaroslavTulach 06:36, 29 July 2018 (UTC)

Adam Bien - July 24, 2018 01:56 AM
From Zero to Hello With Payara Server Full

How long does it take to install, start "Java EE 8 Full Profile" Payara Server, then clone, build and deploy a Java EE application (ping) with Maven 3?

No tricks, no magic, no dependencies:

Also checkout other Java EE "Full Profile" application servers.

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.


Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 20, 2018 05:04 PM
Lean WebApps with Skinny Miniservices #usetheplatfom #slideless Devoxx Poland 2018

"Lean WebApps with Skinny Miniservices #usetheplatfom" session from devoxx.pl 2018 (The Dragon Edition)

See you at MicroProfile With or Without Jakarta EE, at Munich Airport, Terminal 2 and at Single Page Applications (SPAs) -- the "no frameworks, no migrations" approach, at Munich Airport, Terminal 2 or webstandards.training (online).


Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 19, 2018 05:16 AM
Managing Taxi Companies with Thin WARs and Java EE

Victor, please introduce yourself

Hi Adam, thank you first of all to consider me and my project for an interview :-).
My name is Victor Röder, and I'm simply a freelancing software developer and I'm living close to the geographical midpoint of the European Union (at least till 2019), that is in Germany somewhere 70 km north east of Frankfurt/Main.
You can find me on Github https://github.com/victorroeder and on Twitter @vicaware. But in both spheres I'm not that active.

You told me you are building a small Taxi App. Why Java EE?

Yes, in 2017 I actually planned to do a sabbatical and suddenly I got a request from several smaller taxi companies whether I'm willed and able to build something that could help them with their paper-and-pencil-based taxi management. So it would be a software that I could develop on my own, nearly without time pressure and the ability to earn some money, so I said "ok". And - who guessed it - the backend of it is (of course) done using Spring.

Ok, kidding - Java EE :). Or how I meanwhile call it: JSYSNRTO (for 'Java Stuff You Should Not Rename That Often')
Why Java EE? Well through your workshops I could recognize how lean and easy Java EE is/became, so I wanted to use it in a real-life project as soon as possible. And this was an opportunity.
I used J2EE years before and was impressed how it developed. But of course - as every technique - you even can also make it mega complicated with Java EE. So I'm glad to use the Adam Edition of the Enterprise Edition :-).

What is the purpose of the application?

The purpose is to simplify the management of small and medium-sized taxi companies. Every taxicab gets an Android-based provisioned tablet installed with which the drivers could record and manage their shift data and record-only the taxi tours (I'm explicitly writing 'recording-only the tours' since some guys of the German Tax Authority might read this interview as well... "hi guys..." :-D). The tablet itself is connected via BlueTooth to a small mobile printer to print out the tour receipts for the passengers and daily receipts with all shift details at the end of the shift for the drivers themselves.
The tablets transfer the shift and tour information to the backend and request possible changes of the master data if there was a server-side change. The maintaining of the master data is done by the company owner via a web UI. The App for the tablets is installed via the Play Store and the tablets initialize and configure themsevles when they are registered (with a correct key) and accepted by the backend. An easy on-boarding (and usage of the software later on) was very important to me, since I did not want to become a support center :-).

Are you happy with Java EE so far? Is Java EE productive?

Happy: Very. Now that the product is in place since over one year and being now somehow in a retrospective mode while preparing me for this interview, there are of course several things, I would not repeat in future projects. I'm using Vaadin for the backend's UI and I'm quite sure that using JSF would have been more than sufficient and JSF would have integrated better with CDI & stuff. Also I was playing around with the Fat Entity approach for the JPA entities, meaning that the entities managed their persistence themselves (using the ThreadLocal hack), contain the code for JSON de-/serializiation and other logic. Reason was, that a) I wanted to try it out and b) tried to find a way to log (for audit purposes) changes - made by UI users - on JPA level. With hindsight, I would keep it simple. But ok - honestly - I could not blame Java EE for that but rather you Adam, because you wrote about it in your book and thus put the bee in my bonnet ;-P.
The last but not least point that comes into mind, is that the code for JAX-RS and the stateless session beans share the same classes. I should have split that up (and let the JAX-RS classes inject the according session beans - as you recommend it) even if this results in partially tiny classes.

Which application servers, tools or IDEs are you using?

I started development with Glassfish and in production it is still Glassfish. And since I was crazy enough to implement a server-dependent JAAS module for login, my escape possibilities are limited... Locally and for my server's dev environment I'm using Payara. I should align that in a timely manner.
On the other hand I was playing around with other application servers and find them more polished than Glassfish/Payara...
The IDEs: Android Studio for developing the App, IntelliJ for the backend and Eclipse for the BIRT reports. Build tools: Maven for the backend project (because I wanted to) and Gradle for the Android stuff (because I had to). Of course there are many other tools, reminding me that there are nearly no small or trivial software projects out there (especially when you are working on them alone). You have to take care of so many stuff (build & quality environment, database stuff (and integration with other systems), versioning and release process, etc.), that you should always reach your goal with the most possible minimum of complexity and dependencies. Fast deployment and fast unit tests is a key metric. And automate as much and as simple as you can...

You are using the Boundary Control Entity pattern to structure your applications. What were your experiences, challenges and findings so far?

My experiences with BCE are very good. It enforces you to structure your code from the business point of view and not from a technical perspective. That even helps other developers to find their way through the structure more easier. Packages named 'dto' or 'services' say nothing, but business or domain related names show (new) developers clearly the way. Additional benefit: my scroll wheel is happy, too :).
But I used the pattern only for the business-related backend code. The server-centric presentation (and thus part of the backend project) and the Android project are structured slightly different by simply having expressive (again, from business point of view) package names and all topic-related classes are found their according package (without the deeper separation of boundary/control/entity). But classes that are cross-cutting are in the parent package (as it would be for BCE). No Util, Helper or Common packages or classes (bom chicka wah wah ;)

How big is your WAR? On which exernal dependencies are you relying?

4.8 MB. But with tricks. I put several external Jars (like those for Vaadin and BIRT) directly on the application server. Around 850 KB of the total size is my code.
Especially bringing BIRT and the thin WAR approach together is impossible. I thought about externalizing the BIRT stuff into a separate WAR whose services (i.e. report generation) could then be addressed by HTTP/REST... Or maybe I misunderstood the integration of the BIRT runtime somehow...?
(oh boy, this interview creates or reminds me of a lot of To-Dos ;-))

You are an airhacks.com alumni. Do you had any interesting conversations with other attendees (in the extensive breaks :-)

Yes, I already joined several of your workshops and had short but interesting conversations everytime (mostly chewing my food in parallel). And as far I remember all of them were related how to fight the technical or infrastructural complexity beast or dealing with difficult developers, architects, managers, etc that are more interested in creating themselves a monument within the project. None of them was about complaining "Oh, my business is so complex and it's so hard to implement."
Yes, the conversations mirrored my experiences I made with software projects so far, that they are lacking discipline for minimalism on many levels.
And it's a pity that it's often like that...

Victor, big thanks for the interview!


Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 16, 2018 08:52 AM
CDI and plugins, Bean Discovery, Migrations, Async Microservice Communication, Validations with JAX-RS, Serialization---or 52nd airhacks.tv is available

"CDI components as plugins, CDI bean discovery mode recommendations, asynchronous microservice calls, modelling validations with REST, JSON-B and selective serialization, DB migrations with Java EE 7, how to be a happy consultant" , or 52nd airhacks.tv is available:

Any questions left? Ask now: https://gist.github.com/AdamBien/24c3560d05e7bcba9a82af072955a6c4 and get the answers at the next airhacks.tv.

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 13, 2018 05:00 AM
From Zero to Hello with Open Liberty 18 Full Profile Java EE 8

How long does it take to install, start "Java EE 7/8 Full Profile" Open Liberty 18 (the opensource version of IBM WebSphere) server, then clone, build and deploy a Java EE application (ping) with Maven 3?

No tricks, no magic, no dependencies:

Also checkout other Java EE "Full Profile" application servers.

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.


Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 12, 2018 09:23 AM
Generating Swagger / OpenAPI Without External Dependencies

A CRUD JAX-RS 2 (Java EE 7/8) service:


@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
@Path("workshops")
public class WorkshopsResource {

    @GET
    public JsonArray all() {
        return Json.createArrayBuilder().
                add("java").
                add("web").
                build();
    }

    @GET
    @Path("{name}")
    public JsonObject get(@PathParam("name") String name) {
        return null;
    }

    @PUT
    @Path("{name}")
    public void add(@PathParam("name") String name, JsonObject workshop) {

    }

    @DELETE
    @Path("{name}")
    public void remove(@PathParam("name") String name) {

    }
}    

...deployed on MicroProfile compatible application servers (tested with Payara Server 5 Full Profile), emits the following OpenAPI/swagger document from the standardized uri: http://localhost:8080/openapi:


openapi: 3.0.0
info:
    title: Deployed Resources
    version: 1.0.0
servers:
- url: http://localhost:8080/openapi-sample
    description: Default Server.
paths:
    /resources/workshops:
    get:
        operationId: all
        responses:
        default:
            description: Default Response.
            content:
            application/json:
                schema:
                type: object
    /resources/workshops/{name}:
    get:
        operationId: get
        parameters:
        - name: name
        in: path
        required: true
        style: simple
        schema:
            type: string
        responses:
        default:
            description: Default Response.
            content:
            application/json:
                schema:
                type: object
    put:
        operationId: add
        parameters:
        - name: name
        in: path
        required: true
        style: simple
        schema:
            type: string
        requestBody:
        content:
            application/json:
            schema:
                type: object
        responses:
        default:
            description: Default Response.
            content:
            application/json:
                schema:
                type: object
    delete:
        operationId: remove
        parameters:
        - name: name
        in: path
        required: true
        style: simple
        schema:
            type: string
        responses:
        default:
            description: Default Response.
            content:
            application/json:
                schema:
                type: object
components: {}

For the creation of the document above, no additional dependencies, configuration or changes were needed. The example above is a 3.9kB Thin WAR.

Because servers like Payara Server 5 Full Profile or OpenLiberty support Java EE 8 and MicroProfile at the same time, you neither have to change your runtime, nor your lean Java EE 8 build setup:


<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.airhacks</groupId>
<artifactId>openapi-sample</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
   <dependency>
       <groupId>javax</groupId>
       <artifactId>javaee-api</artifactId>
       <version>8.0</version>
       <scope>provided</scope>
   </dependency>
</dependencies>
<build>
   <finalName>openapi-sample</finalName>
</build>
<properties>
   <maven.compiler.source>1.8</maven.compiler.source>
   <maven.compiler.target>1.8</maven.compiler.target>
   <failOnMissingWebXml>false</failOnMissingWebXml>
</properties>
</project>    
For customizations (coming with the MicroProfile OpenAPI) you will need a single provided dependency to the MicroProfile API:

<dependency>
    <groupId>org.eclipse.microprofile</groupId>
    <artifactId>microprofile</artifactId>
    <version>1.3</version>
    <type>pom</type>
    <scope>provided</scope>
</dependency>	    

Enjoy Java EE 8 + MicroProfile and stay light!

See you at MicroProfile With or Without Jakarta EE, at Munich Airport, Terminal 2
Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 11, 2018 04:56 AM
From JSF and PrimeFaces to WebComponents--A Conversation With Cagatay Civici

An airhacks.fm podcast conversation with Cagatay Civici (@cagataycivici) about starting with Java, interfaces and return statements, IBM RAD JSF, Sun JSF Woodstock, Apache MyFaces, Apache MyFaces Tomahawk, JSF Chart Creator, Apache MyFaces Tobago, Oracle's ADF, YUI, jQuery and JSF, the non-dependency mindset, building complex UI components, Jakarta EE and microprofile, a scientific approach to design, choosing colors and color palletes, ideas for themes, standards and PrimeFaces, keeping up with Angular, React and WebComponents, StencilJS, PrimeFaces NG, an opensource model with commercial support, why "Prime", component sponsorship, performance under pressure and PrimeTek.

Subscribe to airhacks.fm podcast via: RSS iTunes

See you at Effective Progressive-, Offline-, Single Page-, Desktop Apps with Web Standards -- the "no frameworks, no migrations" approach, at Munich Airport, Terminal 2 or webcomponents.training (online).
Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 10, 2018 05:00 AM
From Zero to Hello with WildFly Full 13.0.0.Final

How long does it take to install, start "Java EE 7/8 Full Profile" WildFly 13 (and the largest available WildFly distribution) server, then clone, build and deploy a Java EE application (ping) with Maven 3?

No tricks, no magic, no dependencies:

Also checkout other Java EE "Full Profile" application servers.

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.


Real World Java EE Workshops [Airport Munich]>

DukeScript - July 07, 2018 06:34 AM
Maven Surefire Testing Matrix

The standard way to test code in Java ecosystem is JUnit. The standard way to harness JUnit by Maven is the surefire plugin. Usually one doesn’t need to do anything to turn the plugin on - the standard Maven jar packaging does it automatically. However, it is possible to do magic with the plugin configuration and that is what this post is about.

JUnit Browser Intermezzo

However, before we dwell into the plugin configuration, let us set the context by introducing the DukeScript JUnit extension - it allows one to write the code once and then test it in different DukeScript environments. Where DukeScript environment is a basically a JVM configured to render HTML in some way. With a simple @RunWith annotation your code can be executed multiple times, in multiple different setups.

Where’s the problem? By default the JUnit Browser extension runs all the tests in a single Java virtual machine. Yet, some of the environments don’t go along well - for example the webkit presenter is using different GTK version than the default Apache JavaFX presenter. When used together - they crash the JVM.

Matrix of Runs

We need to run the surefire plugin multiple times. How can one do that? One needs to configure multiple test executions:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.10</version>
    <executions>
        <execution>
            <goals>
                <goal>test</goal>
            </goals>
            <id>default-test</id>
            <phase>test</phase>
            <configuration>
                <classpathDependencyExcludes>
                    <exclude>com.dukescript.presenters:webkit</exclude>
                    <exclude>org.apidesign.bck2brwsr:launcher.http</exclude>
                </classpathDependencyExcludes>
            </configuration>
        </execution>
        <execution>
            <goals>
                <goal>test</goal>
            </goals>
            <id>webkit-test</id>
            <phase>test</phase>
            <configuration>
                <classpathDependencyExcludes>
                    <exclude>org.netbeans.html:net.java.html.boot.fx</exclude>
                    <exclude>org.apidesign.bck2brwsr:launcher.http</exclude>
                </classpathDependencyExcludes>
            </configuration>
        </execution>
        <execution>
            <goals>
                <goal>test</goal>
            </goals>
            <id>bck2brwsr-test</id>
            <phase>verify</phase>
            <configuration>
                <classpathDependencyExcludes>
                    <exclude>org.netbeans.html:net.java.html.boot.fx</exclude>
                    <exclude>com.dukescript.presenters:webkit</exclude>
                </classpathDependencyExcludes>
            </configuration>
        </execution>
    </executions>
</plugin>

There are three execution sections. One overriding the default-test run (as added by the jar packaging), one adding another test run at the same test phase verifying the behavior on webkit presenter. In addition to that there is one more (kind of integration) test run which executes the same code transpiled into a JavaScript. As this step takes longer, it is scheduled for the verify phase. As a result one can:

$ mvn test
# or
$ mvn package

and the code is compiled and tested twice quickly. While one can schedule full verification with

$ mvn verify

Configuring the Matrix

The configuration section of each test run needs to alter the setup somehow - each of the runs is supposed to test slightly different environment, right? One can do that by setting different JVM properties, but our example has chosen a different route: it uses different classpath for each execution!

By default we add all three presenters to the project test classpath:

<dependencies>
    <!-- run tests in JavaFX WebView -->
    <dependency>
        <groupId>org.netbeans.html</groupId>
        <artifactId>net.java.html.boot.fx</artifactId>
        <version>${net.java.html.version}</version>
        <scope>test</scope>
    </dependency>

    <!-- run tests in a webkit presenter -->
    <dependency>
        <groupId>com.dukescript.presenters</groupId>
        <artifactId>webkit</artifactId>
        <version>${presenters.version}</version>
        <scope>test</scope>
    </dependency>

    <!-- run tests in bck2brwsr -->
    <dependency>
        <groupId>org.apidesign.bck2brwsr</groupId>
        <artifactId>launcher.http</artifactId>
        <version>${bck2brwsr.version}</version>
        <scope>test</scope>
    </dependency>
</dependencies>

This makes sure the Maven downloads the necessary artifacts and places them into the local repository. Then, each test execution masks all but one of the presenters using builtin surefire plugin classpathDependencyExcludes directive:

<configuration>
    <classpathDependencyExcludes>
        <exclude>org.netbeans.html:net.java.html.boot.fx</exclude>
        <exclude>org.apidesign.bck2brwsr:launcher.http</exclude>
    </classpathDependencyExcludes>
</configuration>

By doing that there is always only one DukeScript presenter available during individual test execution and the JUnit Browser extension picks that one up.

Test runs are isolated in their own JVM and combination of environments no longer negatively influence each other.

Where's the Matrix?

Nice, but where is the matrix? may be your next question! Well, the above example is taken from the DukeScript definitelytyped project which aims at providing Java API to important JavaScript libraries. There are hundreds of libraries ready and all of them share the same testing setup. As such the configuration of the surefire plugin is done in the master pom.xml in its pluginManagement section.

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.10</version>
                <configuration>
<!-- .... -->

By extending the configuration of the surefire plugin in the master pom.xml we can enlarge the axis of additional DukeScript environments. By including more submodules one expands the axis of JavaScript libraries to test. The surefire testing matrix grows with every new commit. Try it, contribute too:

Convert your own library! It is easy, read more, fork and pull request.

Adam Bien - July 06, 2018 08:28 AM
Building PWA with Polymer 3, WebComponents and Java EE 8 Backend

I'm starting with the implementation, build and deployment of a Java EE 8 HTTP/JSON endpoint, then scaffold a polymer 3 Progressive Web Application (PWA) with CLI, and finally create a vanilla Custom Element which calls the Java EE 8 backend. From scratch, without tricks or magic. #usetheplatform

In 8 mins:

See you at Structuring Single Page Applications (SPA)s / Progressive Web Applications (PWA)s with WebComponents -- the "no frameworks, no migrations" approach, at Munich Airport, Terminal 2 or webcomponents.training (online).
Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 05, 2018 11:14 AM
Using enums as CDI Events

Java enum can be used as an CDI "command" event:


public enum OrderEvent {
    CREATE, CANCEL;
}

Now you can sent enum instances:


public class OrderProcessor {

    @Inject
    Event<OrderEvent> events;

    public void createOrder() {
        events.fire(OrderEvent.CREATE);
    }

    public void cancelOrder() {
        events.fire(OrderEvent.CANCEL);
    }
}

...and consume them:


public class OrderMetrics {

    //...

    public void onSuccess(@Observes(during = TransactionPhase.AFTER_SUCCESS) OrderEvent event) {
        switch (event) {
            case CREATE:
                //...
                break;
            case CANCEL:
                //...
                break;
        }
    }
    public void onFailure(@Observes(during = TransactionPhase.AFTER_FAILURE) OrderEvent event) {
        switch (event) {
            case CREATE:
                //...
                break;
            case CANCEL:
                //...
                break;
        }
    }
}    

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.


Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 04, 2018 08:20 AM
When "There is a process already using the admin port 4848", but it is not true

When you try to start Payara 5 / GlassFish with:

asadmin start-domain

...and you get the following error:

There is a process already using the admin port 4848 -- it could be another instance of Payara Server or Payara Micro. Command start-domain failed.

although there is no running Java process and the port is not occupied, you hostname is probably not pingable:

ping $(hostname)

output: Request timeout

Solution:

Add the following line to the /etc/hosts file:

127.0.0.1 [YOUR_NOT_PINGABLE_HOSTNAME]

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 03, 2018 10:39 AM
Combining Serverless Functions with CDI 2.0 from Java EE 8

Serverless functions act as a facade / gateway to business logic. With CDI from Java EE 8, plain POJOs can be directly injected to fnproject.io functions and increase productivity:

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.


Real World Java EE Workshops [Airport Munich]>

Adam Bien - July 02, 2018 07:57 AM
CDI and plugins, Discovery Modes, CompletableFuture and failures, ECB, ReadOnly JPA, Migrations -- or topics for 52nd airhacks.tv

Topics and questions for the 52nd airhacks.tv live show, July 2nd, 6pm:

  1. CDI components as plugins
  2. CDI bean discovery mode recommendations
  3. Dealing with failures in CompletableFuture.allOff
  4. Structuring business applications -- experiences with ECB
  5. Consultancy recommendations
  6. Read-only JPA
  7. How to design validations with REST
  8. Is JSON-B appropriate for selective serialization?
  9. How to implement Flyway Migrations with Java EE
  10. Most important books about programming
Any questions left? Ask now: https://gist.github.com/AdamBien/bfa3a444b6af3316e772f8eaf133f1cb and get the answers at the next airhacks.tv. See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - June 29, 2018 04:14 AM
Serverless Java Functions with JSON-P Parameters

fnproject.io Java functions accept primitve Java types per default. In this screencast JSON-P from Java EE 8 is used to serialize and deserialize parameters and return values from Java streams to JsonObjects (in 9mins):

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - June 28, 2018 03:16 PM
Loading ES 6 String Template Literals Dynamically

ES 6 string template literals they are only parsed once at load time. However, with a trick, they can be also dynamically and lazily loaded on-demand:

See you at Single Page Applications (SPAs) -- the "no frameworks, no migrations" approach, at Munich Airport, Terminal 2 or webstandards.training (online).
Real World Java EE Workshops [Airport Munich]>

Adam Bien - June 26, 2018 05:00 AM
MicroProfile: Past, Present and Future - airhacks.fm Podcast

An airhacks.fm conversation with @emilyfhjiang about reducing the footprint with OpenLiberty, OSGi, Apache Aries Apache Aries, the beginnings of MicroProfile.io, OpenLiberty MicroProfile implementation, writing MicroProfile specs, combining Java EE 8 and MicroProfile.io, the added value of Fault Tolerance, Health, Metrics, Configuration, the process of introducing new APIs to MicroProfile, MicroProfile at GitHub, Java EE Concurrency Utilities and MicroProfile, OpenLiberty Guides, commercial support for OpenLiberty and MicroProfile by IBM, Reactive Microprofile, the relation between Jakarta EE and MicroProfile, MicroProfile standardisation.

Subscribe to airhacks.fm podcast via: RSS iTunes

See you at MicroProfile With or Without Jakarta EE, at Munich Airport, Terminal 2.
Real World Java EE Workshops [Airport Munich]>

Adam Bien - June 25, 2018 04:43 AM
MicroProfile + Java EE 8 = Thinner WARs

openliberty already supports Java EE 8 and MicroProfile APIs at the same time.

Payara 5 follows the same approach: one server runtime comes fully loaded with Java EE 8 and MicroProfile 1.3 support. Even Payara Server 4 ships with Java EE 7 and MicroProfile 1.3.

With this (brilliant) move, I'm able to use MicroProfile features on stock application servers without changing the runtime in production. Unfortunately, your pom.xml will grow by 100% from one dependency to two:


<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version>8.0</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.eclipse.microprofile</groupId>
    <artifactId>microprofile</artifactId>
    <version>1.3</version>
    <type>pom</type>
    <scope>provided</scope>
</dependency>

Hence these are only "provided" dependencies, they are not included in a WAR. I built a Java EE 8, MP 1.3 microservice on stage: http://devoxx.pl with Java EE 8 and MP 1.3 features. It came with 11 kB Thin WAR

See you at Java EE Microservices. Is Munich's airport too far? Learn from home: javaeemicro.services.
Real World Java EE Workshops [Airport Munich]>

DukeScript - June 19, 2018 10:17 PM
Kotlin (and MVVM) Everywhere!

We Love Kotlin and JVM!

Our January post about the importance of proper MVVM for Kotlin explained why the Kotlin language is important.

Now it is time to stress the cross-platform nature of the sample project. With kt-mvvm-demo you write your application once and deploy it to desktop, Android, iOS and browser with the help of portable DukeScript presenters.

Android

The sample project comes with classical Android Gradle installDebug task to package your application as an Android .apk file and deploy it to your device or simulator:

$ ANDROID_HOME=/android-sdk/ ./gradlew installDebug
$ ls app/build/outputs/apk/
app-debug.apk

Kt-Mvvm-Demo on Android

iOS

One can package the same code as an iOS .ipa file with the help of Intel’s Multi OS Engine when running on Mac OS X. First of all list your simulators and then use one of them to launch your application:

$ ./gradlew moeListSimulators
...
- DD9904B6-76CD-4F2D-9153-EC7182878897 - iOS 11.4 - iPhone X
...
$ ./gradlew moeLaunch -Pmoe.launcher.simulators=DD9904B6-76CD-4F2D-9153-EC7182878897

Kt-Mvvm-Demo on iOS

Browser

The same application can also be transpiled to JavaScript and executed in the browser. The bck2brwsrShow tasks generates necessary .js files and launches a browser with the application

$ ./gradlew bck2brwsrShow
...
Showing http://localhost:53241/index.html
...
$ ls -l web/build/web/
bck2brwsr.js
index.css
index.html
lib
main.js

The files in web/build/web directory contain everything needed to execute your application and as such they can be deployed to any HTTP server as a static content. Read more.

Kt-Mvvm-Demo in the browser

With Kotlin MVVM API you can write your code once, deploy and display it everywhere (desktop - gradlew run, Android - gradlew installDebug, iOS - gradlew moeLaunch, browser - gradlew bck2brwsrShow) while using the power of Kotlin, its libraries and any other JVM libraries on every target platform.

The JVM Portability

The fact that one can execute the same Kotlin application on all the above platforms is not like the traditional Kotlin.js and Kotlin.native portability. With Kotlin.xxx one only gets the portability of the Kotlin language, but not the libraries.

With the kt-mvvm-demo project you may bring with yourself JVM libraries - e.g. JARs - from your previous life (e.g. written in Java & other JVM languages) that otherwise can’t go with you to the Kotlin js and native worlds.

We love Kotlin on the JVM!

Adam Bien - June 15, 2018 05:41 AM
Private Fields Serialization with JSON-B and JAX-RS 2.1 / Java EE 8

JSON-B from Java EE 8 serializes public fields or properties as default. For private field serialization:


public class Workshop {

    private String name;
    private int duration;

    public Workshop(String name, int duration) {
        this.name = name;
        this.duration = duration;
    }

}    

you will have to implement a PropertyVisibilityStrategy (checkout Java EE 8: Serializing POJOs with JSON-B):


    public class PrivateVisibilityStrategy implements PropertyVisibilityStrategy {
    
        @Override
        public boolean isVisible(Field field) {
            return true;
        }
    
        @Override
        public boolean isVisible(Method method) {
            return false;
        }
    
    }

...pass your custom configuration to the JsonbBuilder and return the instance with a ContextResolver:


    import javax.json.bind.Jsonb;
    import javax.json.bind.JsonbBuilder;
    import javax.json.bind.JsonbConfig;
    import javax.ws.rs.ext.ContextResolver;
    import javax.ws.rs.ext.Provider;
    
    @Provider
    public class JSONConfigurator implements ContextResolver {
    
        @Override
        public Jsonb getContext(Class type) {
            JsonbConfig config = new JsonbConfig().
                    withPropertyVisibilityStrategy(new PrivateVisibilityStrategy());
            return JsonbBuilder.newBuilder().
                    withConfig(config).
                    build();
        }
    }

Now your POJO's private fields are going to be used for JSON-mapping:


@Path("workshops")
public class WorkshopsResource {

    @GET
    public Workshop workshop() {
        return new Workshop("Java EE 8", 42);
    }

}

Result: {"duration":42,"name":"Java EE 8"}

Tested with Payara 5.

See you at Java EE Workshops at MUC Airport, particularly at the Effective Java EE 8 workshop


Real World Java EE Workshops [Airport Munich]>

Adam Bien - June 12, 2018 03:04 PM
Consuming MicroProfile Metrics with Prometheus

In this (free) screencast I created a MicroProfile project with microprofile-essentials-archetype and exposed method runtime statistics and configured prometheus.io (from docklands) to consume the metrics directly:

Also checkout Exposing Business Metrics with MicroProfile.

See you at Java EE Microservices. Is Munich's airport too far? Learn from home: javaeemicro.services.


Real World Java EE Workshops [Airport Munich]>

Adam Bien - June 07, 2018 09:40 AM
From Versioning, Automation and CI to File Upload, MVC, Scopes and Centralized Logging -- 51st airhacks.tv

"Versioning, tagging, branching, automation, CI/CD, autodeployment in production, JAX-RS and file upload, MVC 1.0 vs. servlets and JSPs, Primefaces as module, @Singleton vs. @ApplicationScoped vs. @RequestScoped and JAX-RS, centralized logging, logging vs. metrics and the future of webassembly":

Any questions left? Ask now: https://gist.github.com/AdamBien/bfa3a444b6af3316e772f8eaf133f1cb and get the answers at the next airhacks.tv.

Audio-only version is also available from: airhacks.fm podcast via: RSS iTunes

See you at Java EE Workshops at Munich Airport, Terminal 2 or Virtual Dedicated Workshops / consulting. Is Munich's airport too far? Learn from home: airhacks.io.


Real World Java EE Workshops [Airport Munich]>