Emanuel Trandafir

I'm Emanuel Trandafir, a passionate Java developer eager to explore and share insights on diverse programming paradigms, tools, and practices. I actively encourage my readers to join me in meaningful discussions, allowing us to learn from each other's perspectives. Beyond work, I love staying active through sports, hiking, and traveling, and I've recently switched from long-distance running to the thrill of rock climbing.

Here's what I've written (so far):

Baeldung on Java

All
Testing (10)
Architecture (8)
Data (7)
Spring Boot (5)
Spring WebFlux (4)
Reactive (4)
Persistence (4)
Spring Data (3)
Spring (3)
Maven (3)
Java Streams (3)
Java Concurrency (3)
Docker (3)
Spring AI (2)
DevOps (2)
Web Services (1)
Spring Web (1)
Java Dates (1)
Java Collections (1)
Java (1)
Jakarta EE (1)
Jackson (1)
JSON (1)
JPA (1)
Core Java (1)
Artificial Intelligence (1)

Java Record vs. Lombok

Filed under Core Java

Learn the differences and similarities between Java 14 Records and Lombok.

Hibernate’s “Detached Entity Passed to Persist” Error

Filed under Persistence

Explanation about detached entities, why occurs the”Detached Entity Passed to Persist” error occurs and how to prevent it.

Constraint Composition with Bean Validation

Filed under Jakarta EE

Learn how to group multiple constraints under a single, custom annotation to reduce code duplication and improve readability

Joining Tables With Spring Data JPA Specifications

Filed under Spring Data

Learn how to use JPA Specifications to query a table based on one of its associated entities.

Hibernate’s “Not-Null Property References a Null or Transient Value” Error

Filed under Persistence

Learn about Hibernate’s PropertyValueException. In particular, the “not-null property references a null or transient value” error message.

Distinct Queries in HQL

Filed under JPA

A quick and practical guide to distinct queries in HQL.

Subtract Days from a Date in Java

Filed under Java Dates

Explore several ways to subtract days from a date object.

Baeldung on Kotlin

All
Testing (1)
Kotlin Strings (1)
Kotlin Numbers (1)
Kotlin Basics (1)
Kotlin Arrays (1)

All
Database Concepts (1)

Multiple Indexes vs. Multi-Column Indexes

Filed under Database Concepts

Explore database indexes, focusing on the differences between individual and composite indexes.

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