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Alejandro Gervasio

Alejandro Gervasio is a senior System Analyst from Argentina who has been involved in software development since the mid-80's. He has more than 12 years of experience in PHP development, 10 years in Java Programming, Object-Oriented Design, and most of the client-side technologies available out there.

Alejandro Gervasio's articles

Using Java Bean Validation for Method Parameters and Return Values

Using Java Bean Validation for Method Parameters and Return Values

Alejandro Gervasio

Three Design Patterns That Use Inversion of Control

Three Design Patterns That Use Inversion of Control

Alejandro Gervasio

Validate Object Graphs with Java Bean Validation’s @Valid Annotation

Validate Object Graphs with Java Bean Validation’s @Valid Annotation

Alejandro Gervasio

Java Bean Validation’s validateProperty() and validateValue() in Three Minutes

Java Bean Validation’s validateProperty() and validateValue() in Three Minutes

Alejandro Gervasio

Using CDI/Weld to Inject JPA/Hibernate Entity Managers

Using CDI/Weld to Inject JPA/Hibernate Entity Managers

Alejandro Gervasio

Introduction to Contexts and Dependency Injection (CDI)

Introduction to Contexts and Dependency Injection (CDI)

Alejandro Gervasio

Effective Domain Model Validation with Hibernate Validator

Effective Domain Model Validation with Hibernate Validator

Alejandro Gervasio

Building a Web App with Java Servlets

Building a Web App with Java Servlets

Alejandro Gervasio

A Hibernate Introduction – Persisting Java Objects the Easy Way

A Hibernate Introduction – Persisting Java Objects the Easy Way

Alejandro Gervasio

Inversion of Control – The Hollywood Principle

Inversion of Control – The Hollywood Principle

Alejandro Gervasio

The Single Responsibility Principle

The Single Responsibility Principle

Alejandro Gervasio

Introduction to the Law of Demeter

Introduction to the Law of Demeter

Alejandro Gervasio

The Null Object Pattern – Polymorphism in Domain Models

The Null Object Pattern – Polymorphism in Domain Models

Alejandro Gervasio

Constructors and Breaking the Liskov Substitution Principle

Constructors and Breaking the Liskov Substitution Principle

Alejandro Gervasio

Subtype Polymorphism – Swapping Implementation at Runtime

Subtype Polymorphism – Swapping Implementation at Runtime

Alejandro Gervasio

Patterns for Flexible View Handling, Part 1 – Working with Composites

Patterns for Flexible View Handling, Part 1 – Working with Composites

Alejandro Gervasio

An Introduction to the Front Controller Pattern, Part 2

An Introduction to the Front Controller Pattern, Part 2

Alejandro Gervasio

An Introduction to the Front Controller Pattern, Part 1

An Introduction to the Front Controller Pattern, Part 1

Alejandro Gervasio

Reusing Implementation – a Walk-through of Inheritance, Composition, and Delegation

Reusing Implementation – a Walk-through of Inheritance, Composition, and Delegation

Alejandro Gervasio

The Layer Supertype Pattern: Encapsulating Common Implementation in Multi-Tiered Systems

The Layer Supertype Pattern: Encapsulating Common Implementation in Multi-Tiered Systems

Alejandro Gervasio

Decoupling Interfaces from Implementation – Using Separated Interfaces

Decoupling Interfaces from Implementation – Using Separated Interfaces

Alejandro Gervasio

Implementing a Unit of Work – Handling Domain Objects through a Transactional Model

Implementing a Unit of Work – Handling Domain Objects through a Transactional Model

Alejandro Gervasio

Handling Collections of Aggregate Roots – the Repository Pattern

Handling Collections of Aggregate Roots – the Repository Pattern

Alejandro Gervasio

The Dependency Inversion Principle

The Dependency Inversion Principle

Alejandro Gervasio

An Intro to Virtual Proxies, Part 2

An Intro to Virtual Proxies, Part 2

Alejandro Gervasio

An Introduction to Services

An Introduction to Services

Alejandro Gervasio

Building a Domain Model – An Introduction to Persistence Agnosticism

Building a Domain Model – An Introduction to Persistence Agnosticism

Alejandro Gervasio

The Liskov Substitution Principle

The Liskov Substitution Principle

Alejandro Gervasio

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