Eric Martin

Baeldung on Java

All
Java (74)
Java String (56)
Java IO (44)
Testing (43)
Spring Boot (43)
Core Java (38)
Persistence (31)
Spring Data (28)
Java Numbers (28)
Java Array (28)
Java List (27)
Java Concurrency (27)
Spring (26)
Java Map (26)
JVM (24)
JPA (24)
Data (23)
Algorithms (22)
Java Collections (19)
Security (18)
JSON (16)
Maven (15)
DevOps (14)
Spring Security (13)
NoSQL (13)
Java Streams (13)
Java Dates (13)
HTTP Client-Side (12)
REST (11)
Architecture (11)
Spring MVC (10)
Cloud (10)
Artificial Intelligence (10)
Logging (9)
Spring AI (8)
Networking (8)
Jackson (8)
IDE (8)
Spring Web (7)
Spring Cloud (7)
Groovy (7)
Gradle (7)
Jakarta EE (6)
Web Services (4)
Spring Persistence (4)
Reactive (4)
XML (3)
Spring WebFlux (3)
Java Web (3)
Docker (3)

How to Set Content-Length Header in ResponseEntity in Spring MVC

Setting the Content-Length header in Spring MVC’s ResponseEntity is straightforward, but it should be done explicitly and only when required.

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Why Use the Returned Instance of Spring Data JPA Repository’s save() Call?

Filed under JPA, Spring Data

Learn why it is important to always use the instance returned by the save() method with unit tests to show what happens during both persisting and merging

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Joining Tables Without Relation Using JPA Criteria

Filed under JPA

Explore how to construct a JPA criteria query to join tables without explicitly defining the JPA relationship.

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Casting JSONArray to int Array in Java

Filed under Java Array, JSON

A practical walk through to converting a JSONArray to an int array in Java.

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Finding the Collection of All IDs in a Collection of Entities

Filed under Java Collections, Persistence

Explore different ways to collect IDs from a collection of entity objects..

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API Versioning in Spring

Filed under Spring MVC

Learn about API versioning in Spring Framework and Spring Boot.

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Select Text From the Autocomplete Input using Selenium

Filed under Testing

Explore how to use Selenium to interact with an autocomplete-enabled search bar on a website.

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Inserting BLOB Using Spring JdbcTemplate

Filed under Spring Persistence

Explore different practical techniques for inserting BLOB data using Spring’s JdbcTemplate.

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Access Resources in a Quarkus Native Image

Filed under Java

Explore various ways of making resources available to an application that is bundled as a Quarkus Native Image.

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Baeldung on Linux

All
Administration (80)
Scripting (76)
Files (72)
File Editing (48)
Filesystems (29)
File Searching (25)
Text Processing (23)
Processes (23)
Installation (18)
Web (15)
File Viewing (12)
Security (10)
Package Management (7)
Docker (7)
User Administration (6)
Search (6)
Networking (6)
Boot Process (5)
Network Configuration (4)
File Permissions (4)
File Conversion (4)
File Compression (4)
Network Monitoring (3)
Building (3)
Service Management (1)
File Transfer (1)

How Do File Permissions Work for the Root User

Filed under File Permissions

Learn how file permissions work for the root user, how root can override them, and discover scenarios where even the root is restricted.

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What Are the Differences Between [0-9], [[:digit:]] and \d

Filed under File Searching, Scripting

Explore these expressions, compare them, discuss how they behave differently under various conditions, and provide practical Linux examples to show their differences

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Identifying the Window Manager and Desktop Environment in Linux

Filed under Administration

Break down the differences between a Window Manager and a Desktop Environment then discuss different methods to identify each.

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Dual Boot Ubuntu Alongside macOS

Filed under Boot Process

Learn how to install Ubuntu along with macOS on Intel-based Macs.

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How to Tell if a Linux Machine Supports AVX/AVX2 Instructions

Filed under Administration

Learn how to tell if a Linux machine supports Advanced Vector Extensions (AVX) and its extension, AVX2 instructions.

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What Is a Bootloader in Linux?

Filed under Boot Process

Learn about what a bootloader is and how it works to load and initialize an operating system

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What’s the Difference Between find . and find . -print

Filed under File Searching

Explore difference between find . and find . -print including their historical context and subtle differences

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How to Uninstall GNOME Stock Applications

Filed under Installation

Learn how to remove the stock GNOME apps from several distributions, using their respective package manager

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Executable Cannot Be Found Although It’s in the $PATH in Alpine Docker

Filed under Docker

Explore the common “executable not found” error in Alpine Docker containers and how to fix it, including causes like missing libraries and mismatched architectures.

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Baeldung on Scala

All
Testing (1)
Scala Web (1)
Scala Strings (1)

Testing With Gatling Using Scala

Filed under Scala Web, Testing

See how to easily write scenarios to performance test your REST application using Gatling with Scala.

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Generate Secure Random Passwords in Scala

Filed under Scala Strings

Learn how to generate secure random passwords with various criteria.

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Baeldung on Computer Science

All
Machine Learning (17)
Algorithms (15)
Programming (13)
Networking (12)
Security (9)
OS (9)
Artificial Intelligence (7)
Searching (6)
Latex (6)
Math and Logic (5)
Data Structures (5)
Core Concepts (5)
Deep Learning (4)
Web (3)
Sorting (3)
Software Architecture (3)
Trees (2)
Graphs (2)
Graph Traversal (2)
Path Finding (1)
Concurrency (1)
Computer Vision (1)

How to Start Building an Operating System

Filed under OS

Examine resources that apply to all operating system development endeavors and explore learning paths based on specific operating system concepts and programming languages.

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How to Calculate the Number of Tag, Index, and Offset Bits of Different Caches

Filed under Core Concepts

Learn how to calculate the allocation of tag, index, and offset bits in different cache architectures.

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What Is Prompt Engineering?

Filed under Artificial Intelligence

Learn about prompt engineering, its importance, various prompt techniques, and components.

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Introduction to the Fetch-Execute Cycle

Filed under OS

Explore the Fetch-Execute cycle and its stages in detail.

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How to Implement a Queue Using Two Stacks?

Filed under Data Structures

Learn two approaches to simulating a FIFO queue using two LIFO stacks.

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WaveNet Speech Synthesis

Filed under Deep Learning

Study speech synthesis using the WaveNet model

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Detecting Syllables in a Word

Filed under Artificial Intelligence

Explore several approaches to finding syllables in a word, which is an important task in natural language processing (NLP).

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SEO: Off-Page vs. On-Page Techniques

Filed under Web

On-page SEO focuses on optimizing individual web pages, while off-page SEO focuses on improving a website’s overall quality

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Baeldung on Kotlin

All
Kotlin Collections (3)
Kotlin Strings (2)
Kotlin Numbers (2)
Kotlin Classes and Objects (2)
Kotlin Arrays (2)
Security (1)
Kotlin IO (1)
Kotlin Functions (1)
Kotlin (1)
HTTP Client-Side (1)

Resolving Kotlin Error: “Primary constructor call expected”

Filed under Kotlin Classes and Objects

Explore various approaches to fixing this error, illustrating each with problematic code examples, their solutions, unit tests, and detailed explanations.

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Kotlin Application Deployment With Docker and Kubernetes

Filed under Kotlin

Learn to deploy a simple Kotlin application to Kubernetes (K8s) using Docker and Docker Hub.

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Spring Security JWT With Kotlin

Filed under Security

See a Spring Boot application example with tests to use JWT and secured endpoints.

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Convert a Data Class to ByteBuffer in Kotlin

Filed under Kotlin Classes and Objects

Learn how to convert a Kotlin data class to a ByteBuffer using different forms of serialization

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Rename a File in Kotlin

Filed under Kotlin IO

Learn how to use the built-in method exposed by the File class or use the Files class from the Java NIO package to rename files in Kotlin

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Getting Binary Representation of Int in Kotlin

Filed under Kotlin Numbers

Explore the methods available in Kotlin to get the binary representation of integers.

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Check if a Number Can Be Expressed as Sum of Two Prime Numbers in Kotlin

Filed under Kotlin Numbers

Explore multiple approaches to checking if a number can be expressed as the sum of two prime numbers.

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Convert String Array to Int Array in Kotlin

Filed under Kotlin Arrays, Kotlin Strings

Learn to convert a String array to an Int array in Kotlin and how to handle potential exceptions.

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Baeldung on Ops

All
Docker (30)
Kubernetes (26)
Jenkins (6)
Git (6)
Cloud (3)
Logging (1)
DevOps (1)

How to Change a Docker Container’s MTU

Filed under Docker

By keeping container MTU settings in sync with the host and the broader network infrastructure, teams can minimize packet loss, avoid fragmentation, and maintain consistent performance, even in environments that involve tunnels, VPNs, or overlay networks.

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Sticky Session on Kubernetes Cluster

Filed under Kubernetes

Explore how sticky sessions work in Kubernetes, why they are important for stateful applications, and the different ways they can be implemented.

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Monitor Jenkins Build Status in a GitHub Repository

Filed under Git, Jenkins

Learn two efficient methods for tracking Jenkins build status directly within GitHub.

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Create Namespace Using Helm Templates

Filed under Kubernetes

Learn how to create a namespace using Helm templates, ensuring consistency and reusability in your Kubernetes deployments

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Passing Environment Variables to a Vue App at Runtime

Filed under DevOps

Walk through a practical approach to dynamically injecting environment variables and configuring the app to read them effectively.

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Understanding backoffLimit in Kubernetes Jobs

Filed under Kubernetes

Explore backoffLimit, its importance, practical applications, how to configure it effectively, and tips for balancing reliability with resource efficiency.

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Load a Docker Image From a Tar File

Filed under Docker

Learn how to save Docker images into tar files and load them back in

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Guide to Setup Jenkins on Kubernetes

Filed under Jenkins, Kubernetes

Deploying Jenkins on Kubernetes offers a robust, scalable solution for automating CI/CD pipelines, enabling seamless integration and delivery across software projects.

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Docker Interactive Mode After Executing Script

Filed under Docker

Learn how to run a script inside a Docker container after its creation and access to a shell terminal

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Baeldung on SQL

All
SQL Queries (10)
Database Concepts (4)
SQL Tables (3)
SQL Views (2)
Security (1)
SQL Joins (1)
SQL Basics (1)
Database Access (1)
DML (1)

Update Multiple Rows With Different Values With Single Query

Filed under SQL Queries

Explore how to update multiple rows with different values, depending on the value of existing columns

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Generate SQL Insert Script From Excel Worksheet

Filed under SQL Queries

Explore methods for generating SQL INSERT scripts from an Excel worksheet and best practices for ensuring a smooth execution process.

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SQL injection that gets around mysql_real_escape_string()

Filed under Security

Review some obscure corner cases that enable malicious inputs to slip past mysql_real_escape_string().

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SQL Query for Calculating a Rolling 7-Day Average

Filed under SQL Queries, SQL Views

Discuss a general approach to calculating a 7-day rolling average, including indexed views in MSSQL Server, materialized views in MySQL, and materialized views with refresh in PostgreSQL.

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