141stAirhacksQ&A.md

Ask questions and see you on 15th December at 8pm CET: youtube.com/c/bienadam

Also check out the latest episode:

Please keep the questions as short and as concise as only possible. Feel free to ask multiple, shorter questions. I will also answer some questions in my "shorts" youtube.com/@bienadam/shorts between the shows.

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Many people claim that C++ is faster than Java. However, Java has the advantage of the Hotspot VM. In a benchmark that I wrote (sorting a large array of random strings) Java turned out to be about 3 times faster. Did you ever write a benchmark to compare Java and C++ for yourself?

"Is it a good idea to use Angular with AI or without?" 👉 question (Adrian M.) from Java User Group Vienna meetup.

@AdamBien the question also includes whether you would in general recommend Angular (your personal opinion on it).

How do you approach testing your b/s logic if they call external apis?

Hi Adam,

thanks for the BCE project! It's great.

Question 1: In which package to put the data access classes? in the ebank project they reside inside the controller package, but I did expect them in the boundary package, because they do external communication as the database is an external system.

Question 2: Where to put the DTO entities?

Question 3: How to convert between domain entities and DTO entities? What about the following approach:

package com.test.user.entity;

public record User(String name, ...){
  
 public UserDTO toDto(){
      return new UserDTO(this.name, ...)
  }
  
  public static User fromDto(UserDTO dto){
      return new User(dto.username(), ...)
   }

}    

Question 4: How to communicate between modules? Create an interface in module A's boundary package and call it from module B?

What do you think? Thank you in advance.

Considering a Java application, potentially with MicroProfile, that needs to support multi-tenancy where each tenant (client) has a dedicated database, what approach would you recommend?

Specifically, should we pursue a 'one application instance per tenant database' model or a 'single shared application instance' that dynamically routes requests to the correct tenant database based on a tenant identifier in the incoming request? Do you know if panache/hibernate supports that?

Time machine: 41st airhacks.tv from 7th August 2017:

"React over Angular? ...and WebStandards, JSR-375 and REST, Reactive Programming vs. CompletableFuture, Blocking @asynchronous calls, Interceptors with EntityManager, AMQP and data masses, To Framework Or Not To Framework, Unit Testing Primefaces, Multi-Threaded JAX-RS 2.0 Clients, Java EE "vs." .NET, Dynamic entities, Data encryption, Working offline with JPA, Sample Projects, Industry trends, Conferences and Co., Server Side Rendering with Java EE 7, Naming CRUD in BCE, Java 9 Logging interface, Generic REST client, React.js / Polymer examples, Session replication challenges"

👉 https://adambien.blog/roller/abien/entry/react_over_angular_reactive_programming

How do you manage transactions when you spawn threads(virtual/use of completable futures etc) in your code base? AFAIK transactions are per-thread and spawning a thread for whatever reason will detach from the transaction boundary.