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Baeldung Author

Mateusz Szablak

Application Developer - Java/Spring/Oracle/Microservices as a prior backend technology stack. Crossover knowledge of different programming languages and additional frameworks. Solid theoretical background. Interested in algorithms, problem-solving, and design patterns usage. Author of technology guides and articles. Job experience - involved in maintaining and developing new features in big-industry projects (telco & banking). After work hours - gaming passionate - playing, also developing (mainly Android) and 3D modeling/graphics.

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

Baeldung on Java

All
Java IO (4)
Testing (2)
Java Map (2)
Spring Web (1)
Spring Data (1)
Java String (1)
Java Numbers (1)
Java Dates (1)
JPA (1)
HTTP Client-Side (1)
DevOps (1)
Core Java (1)

How to Pretty-Print a Map in Java

Filed under Java Map

Learn different approaches for pretty-printing maps in Java.

Time Conversions Using TimeUnit

Filed under Java Dates

We look at how to use TimeUnit to convert durations between units and avoid creating our own hard-to-read math code.

Creating a Test Suite With JUnit

Filed under Testing

Learn two different ways for creating test suites with JUnit.

TRUNCATE TABLE in Spring Data JPA

Filed under Spring Data

A quick and practical guide to truncating table in Spring Data JPA.

SpringRunner vs MockitoJUnitRunner

Filed under Testing

Learn the key differences between SpringRunner and MockitoJUnitRunner and understand their purpose.

Constructing a Relative Path From Two Absolute Paths in Java

Filed under Java IO

Learn how to construct a relative path from two absolute paths in Java.

Difference Between == and equals() in Java

Filed under Core Java

Learn about the reference and value equality checks in Java, the differences between them, and understand when to use which check.

Finding the Last Row in an Excel Spreadsheet From Java

Filed under Java IO

Learn how to find the last row in an Excel spreadsheet using Java and Apache POI.

Validate String as Filename in Java

Filed under Java IO

Learn how to validate if a given string has a valid filename for the OS, using Java.

Guide to Java BigInteger

Filed under Java Numbers

Learn about the implementation details of the BigInteger class in Java.

Baeldung on Ops

All
Docker (2)
Git (1)

Mounting a Single File in a Volume Using Docker

Filed under Docker

Learn multiple ways for mounting a single file in a volume using Docker.

Difference Between Expose and Ports in Docker Compose

Filed under Docker

Explore the differences between expose and ports when using Docker Compose.

Git for Beginners: The Definitive Practical Guide

Filed under Git

A step-by-step guide to Git, this article discusses the most commonly used commands. Learn the basics, the Git workflow, branching and even some advanced techniques like modifying your commit history.