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}
(...)
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A book about rethinking Java EE Patterns

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.

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A book about rethinking Java EE Patterns

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).


NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards

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A book about rethinking Java EE Patterns

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.


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A book about rethinking Java EE Patterns

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.


NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards

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A book about rethinking Java EE Patterns

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).


NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards

Airport MUC workshops: Web (SPA, PWAs, Offline, Desktop, Mobile) Applications Essentials and Effective Web Applications. No migrations. #usetheplatform

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A book about rethinking Java EE Patterns

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.

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A book about rethinking Java EE Patterns

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).


NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards

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A book about rethinking Java EE Patterns

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!


NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards

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A book about rethinking Java EE Patterns

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.


NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards

Airport MUC workshops: Web (SPA, PWAs, Offline, Desktop, Mobile) Applications Essentials and Effective Web Applications. No migrations. #usetheplatform

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A book about rethinking Java EE Patterns

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