Hibernate and Spring - Unleash the Magic

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This document provides an overview of several Java technologies: - JPA Auditing for tracking entity creation/modification dates and users - Domain Events in DDD for triggering processing across aggregates - javax.validation for validating entities before database writes - Spring Data Repos for implementing repositories with query methods and custom logic It also briefly discusses JPA auditing implementation, domain event publishing, custom validators, and the @NonNullApi annotation for preventing null returns from repositories.

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Get Set ....
• JPA Auditing
• Domain Events
• javax.validation
• Spring Data Repos

JPA Auditing
• @CreatedBy / Date
• @LastModifiedBy / Date
• Relies on @PrePersist, @PreUpdate JPA Hooks defined via
• @EntityListeners on @Entity or
• global via orm.xml
• User is retrieved from an AuditorAware
• Typically from Spring Security Session (SecurityContextHolder)

Domain Events (DDD)
• Problem: logic inside an @Entity methods needs to trigger further
processing, involving other unrelated Aggregates
• At .save(e), the Entity is scanned for a @DomainEvents getter
• Pitfall: What if I forget to .save()?
• Pitfall: Auto-flushing the dirty entity does NOT publish the events
➔Alternative: static EventPublisherHolder
• Events are delivered to all interested @EventListener
• In the same transaction (default, safest)
• After the current transaction COMMITS - @TransactionalEventListener

javax.validation
• Before writing to DB, @Entities are automatically validated:
• @NotNull
• @Size(min=)
• @Pattern(regexp=)
• ...
• Custom Validators (even loaded from Spring)

CustomerRepository
Customer findByName(String name);
@Query("SELECT c FROM Cust... ")
List<Customer> getActiveCustomers();
JpaRepository<E,ID>
List<E> findAll();
E findOne(ID);
void save(E);
void delete(E); ...
CustomerRepositoryCustom
List<Customer> search(CustomerSearch);
CustomerRepositoryImpl
List<Customer> search(CustomerSearch) {
...<implem>...
}
CustomBaseRepository<E,ID>
E findExactlyOne(ID id);
CustomBase
RepositoryImpl
<implem>
naming
convention
Spring Data Repo Architecture
JpaSpecificationExecutor<E>
List<E> findAll(Specification<E> spec);
QuerydslPredicateExecutor<E>
List<E> findAll(Predicate spec);
Codegeneration
via
Maven Plugin

@NonNullApi
on ...repo/package-info.java
Repo method cannot return null anymore
You have to return Optional<>

Finish!
• JPA Auditing
• Domain Events
• javax.validation
• Spring Data Repos

If you decide to use magic
make sure THE ENTIRE team understands it

Hibernate and Spring - Unleash the Magic

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Throughout the years, the Concentric Architectures (Onion, Hexagonal, Clean-..) have grown into the undisputed leader among backend systems architectures. With the rise of Domain-Driven Design, keeping your Domain ring 'agnostic' to the outside world has become the norm today. But history proved that any 'norm' in software architectures will cause overengineering if applied without criticism. After a brief recap of these architectures, their pitfalls, and weaknesses, we'll see two alternatives that segregate code not in 'layers' or 'rings' but in vertical slices: Feature Slicing and Modular Monolith. [Feature Slicing](vertical Slice Architecture) (aka *UseCase) has its own pitfalls and weaknesses, that we'll briefly review. But this will just warm us up for the next style. Modular Monolith (aka Modulith) is an architecture style that helped many companies break their legacy codebases, and smoothly move to microservices. Most of the techniques discussed here can also come handy when one single microservice grew big and needs to be broken down. Even more, greenfield projects today opt for this architecture instead of microservices, to avoid paying the high cost of distributability. Imagine cohesive but decoupled modules living in the same code base & deployment, but on which different teams work in harmony, delivering more value much faster than an equivalent microservice ecosystem.🦄 On the agenda: - patterns to break data structures - how to protect Domains inside modules - communication patterns between modules - breaking cyclic dependencies

Vertical Slicing Architectures

Victor Rentea

Tests are hard to write if the production design is crappy - goes an old saying. Indeed, writing unit tests gives you one of the most comprehensive, yet brutal, feedback about the design of your production code, but if it comes too late, many developers can’t take it and they will either stop testing or test superficially. At the other end, others struggle to write contrieved, fragile tests full of mocks that end up frustrating more than helping them. This talk reviews the main hints that unit tests provide you, from the most obvious improvements to some of the most subtle design principles.

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Decades ago, IT started as a single engineering practice, but as time passed by it got increasingly fragmented. Conflicts broke out between testers vs developers vs sysadmins vs DBAs vs many other roles. Recently, developers themselves split into many subspecialties like backend/frontend/iOS/Android/microservices/functions/etc. The overspecialization we face today causes huge communication overhead, a low bus factor, lack of responsibility, blaming, repeated isolated patching and fulminating costs. The software craftsmanship movement is rising in this post-agile world with professionals eager to take control of their careers and continuously learn in the pursuit of mastery. This talk will show you practical ways in which to seed a continuous learning culture in your team or company, and foster the enthusiasm of your developers.

Extreme Professionalism - Software Craftsmanship

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aaaaThis presentation focuses on two of the most advanced design tools in your toolbox, whatever the language or framework you might be using. After understanding the basics, we'll see how these concepts can be used in real-world scenarios to simplify those several most complex use-cases in your application. At the end of a mix of slides and live-coding, you'll finally understand the power of these ideas and become prepared to apply them in your day-to-day work. Along the way, we'll introduce concepts like Side Effects, Idempotency, Referential Transparency, Pure Functions and Deep/Shallow Immutability. Also, we'll talk about the powerful Functional Code / Imperative Shell architecture that you can use for your complex workflows. Prepare for an entertaining, highly interactive session that will answer all your questions. Written in Java and spoken in English.

Pure functions and immutable objects @dev nexus 2021

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In this workshop I will share my experience as a full-time trainer since the COVID-19 outbreak, discussing the techniques I tried, what failed, and what worked, how delivering workshops changed, and what must you do to adapt to today's savage training environment. This is not a sales pitch, but I really want to help you during these times. Agenda: - Impactful content type - Ideal group size - Ways to adjust the content to remote audiences - Engaging techniques that really work - Critical Timing: tricks for better time-use - The art of asking for questions - Ways to persist your impact after the session - Building trust that Online Does Work! - When and How to gather significant feedback? - Marketing your webinar Target Audience: The discussion is not technical (doesn't involve many programming concepts), so anyone interesting in delivering, facilitating or contracting effective online training sessions is invited. Also those preparing to deliver a talk at a conference can benefit from many ideas

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At the recent Microsoft Ignite 2023 conference, Microsoft unveiled a groundbreaking strategy that will redefine enterprise work management. The plan involves integrating Microsoft’s key planning tools, Microsoft To Do, Microsoft Planner, and Microsoft Project for the web into a unified experience called “Microsoft Planner.” What does this new strategy from Microsoft mean for current users? Join us and learn how best to take advantage of this announcement while gaining a clear path on how to elevate the current state of Microsoft Planner from a basic task manager to a comprehensive tool for Enterprise Work Management using OnePlan. Learn how OnePlan’s integration with Microsoft Planner allows for strategic alignment with business goals through advanced features like strategic planning, portfolio management, resource management, financial management, and more!

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In today's dynamic e-commerce landscape, the payment gateway emerges as a linchpin, ensuring smooth and secure transactions between buyers and sellers. In this discourse, we delve into the meticulous process of devising test cases tailored for scrutinizing payment gateways. Crafting precise test cases for payment gateways is a quintessential responsibility for testers operating within the service industry. This article meticulously explores pivotal scenarios integral to how to test payment gateways, coupled with essential guidelines for drafting effective test cases.

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ADR, or Architecture Decision Record, is a valuable tool in software development for several reasons. It provides a centralized location for documenting and tracking architectural decisions, aiding both current and future team members. ADRs enhance communication among team members by documenting the rationale behind architectural decisions, especially beneficial during onboarding of new team members or when revisiting decisions. They serve as a knowledge base, enabling teams to learn from past decisions and refine their decision-making process. Additionally, ADRs contribute to transparency by helping stakeholders understand the reasons behind specific architectural choices. As with any other tool or process, introducing them into an organization can face several obstacles, and overcoming these challenges is crucial for successful implementation. In this talk I go through some common problems and our way of solving them.

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Hibernate and Spring - Unleash the Magic

2. Victor Rentea VictorRentea.ro Recorded Talks, Blog, Video Courses, ... Independent Trainer Founder of Bucharest Software Craftsmanship Community Java Champion ❤️ Simple Design, Refactoring, Unit Testing ❤️

3. Training 500 days (200+ online) 2000 devs 8 years 50+ companies Reach out to me: Hibernate Spring Func Prog Java Performance Reactive Prog Design Patterns Pragmatic DDD Clean Code Refactoring Unit Testing TDD @victorrentea Intense Video Courses: victorrentea.teachable.com More: VictorRentea.ro

4. VictorRentea.ro 74 ¡¡ PLEASE !! Ask questions!

6. Get Set .... • JPA Auditing • Domain Events • javax.validation • Spring Data Repos

7. JPA Auditing • @CreatedBy / Date • @LastModifiedBy / Date • Relies on @PrePersist, @PreUpdate JPA Hooks defined via • @EntityListeners on @Entity or • global via orm.xml • User is retrieved from an AuditorAware • Typically from Spring Security Session (SecurityContextHolder)

8. Domain Events (DDD) • Problem: logic inside an @Entity methods needs to trigger further processing, involving other unrelated Aggregates • At .save(e), the Entity is scanned for a @DomainEvents getter • Pitfall: What if I forget to .save()? • Pitfall: Auto-flushing the dirty entity does NOT publish the events ➔Alternative: static EventPublisherHolder • Events are delivered to all interested @EventListener • In the same transaction (default, safest) • After the current transaction COMMITS - @TransactionalEventListener

9. javax.validation • Before writing to DB, @Entities are automatically validated: • @NotNull • @Size(min=) • @Pattern(regexp=) • ... • Custom Validators (even loaded from Spring)

10. CustomerRepository Customer findByName(String name); @Query("SELECT c FROM Cust... ") List<Customer> getActiveCustomers(); JpaRepository<E,ID> List<E> findAll(); E findOne(ID); void save(E); void delete(E); ... CustomerRepositoryCustom List<Customer> search(CustomerSearch); CustomerRepositoryImpl List<Customer> search(CustomerSearch) { ...<implem>... } CustomBaseRepository<E,ID> E findExactlyOne(ID id); CustomBase RepositoryImpl <implem> naming convention Spring Data Repo Architecture JpaSpecificationExecutor<E> List<E> findAll(Specification<E> spec); QuerydslPredicateExecutor<E> List<E> findAll(Predicate spec); Codegeneration via Maven Plugin

11. @NonNullApi on ...repo/package-info.java Repo method cannot return null anymore You have to return Optional<>

12. Finish! • JPA Auditing • Domain Events • javax.validation • Spring Data Repos

13. If you decide to use magic make sure THE ENTIRE team understands it

Hibernate and Spring - Unleash the Magic

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