Robuta

Learn methods to get the number of filesystem objects under a given path using ls and wc.

Learn how to use a prefix for environment variables with Spring Boot.

Learn three approaches to verifying multiple properties in one assert call using JUnit5 and AsssertJ.

Explore various strategies and techniques to effectively refresh and fetch entities after saving in JPA.

Learn how to use Testcontainers to test a Quarkus microservice with real dependencies.

Learn about the differences between Java's HashMap and Hashtable collections

Learn how scale LaTeX equations with \resizebox.

Learn how to serialize and deserialize JSON arrays with Kotlin using Gson

Learn to check if a Mono is empty in Kotlin and define static and dynamic fallback values to create robust reactive flows.

Although not the standard workflow, it can be handy to understand how one would create an Avro schema from a set of Java classes. It turns out we can use the...

Learn how to set the CPU governor for all cores at once.

Explore priority inversion in scheduling processes and how to avoid it.

Learn about the differences between updating and upgrading when using the Advanced Package Tool (APT).

Learn how to compute the percentage improvement when the performance metric is time.

In this article, we look at the AuthorizationManager in Spring Boot.

Learn how Spring Data repositories can be effectively applied to database views

Learn how to interact with a MySQL database using Apache Cayenne ORM.

Explore the main similarities and differences between support vector machines and neural networks.

A quick and practical guide to setting default values when using the @Value annotation in Spring.

Explore various ways to compare Long values using Java's Collections.sort() method.

Learn how to reformat Java source files using command line formatting tools.

Learn how to extend the possibilities of your API by implementing the OR query operation

Learn to generate identifiers whose lexicographic order preserves the order in which they're created.

Explore different methods for programmatically correcting fisheye images.

This week is definitely about testing - TDD, Unit Testing and the new test support in the upcoming Spring Security 4.

Learn why and how to use a private constructor for a class in Java.

Learn how to implement the metaheuristic Bat Algorithm in Python.

Learn what the in and !in operators do. Explore their typical usage and find out how to overload the in operator.

Discover different full-text search algorithms implemented using plain Java.

Amit has over 9+ years of work experience, currently working on Java, Kotlin, Spring boot stack.

A quick and practical introduction to secret key and string conversion in Java.

A quick and practical example of validating input using Finite Automata in Java.

Learn the difference between Array, ArraySeq, ArrayOps, and WrappedArray in Scala

Learn the remove() then put() approach to replacing a key in a Java HashMap.

Read up on how to code selection sort in Java, how it works, and what its complexity is.

Learn how to install OpenJDK and Oracle JDK versions 8 through 11 on Ubuntu systems.

Learn how to view system properties and hardware information via Linux commands.

Learn about perplexity, a metric for assessing how well language models are performing on linguistic tasks.

Learn how Quartz handles persistence with its JDBC JobStore and how to achieve it with a custom approach.

A quick tutorial on the history of Java dates and time.

Learn how the Pair class works in Kotlin.

Learn about ways to delete files with names that contain non-printable characters.

Learn about different tools in Linux for generating TCP traffic.

Learn how to split large files into small files by size and the specified number of files.

A quick tutorial on async exception handling in Kotlin coroutines.

Keep up-to-date with the main developments in the Java world through this weekly guide.

Explore commonly used command-line approaches to import an SQL file in MySQL.

Explore Kotlin's preconditions for validating arguments and states. Learn when to use each precondition function.

Guava Ordering Cookbook illustrating code examples and nothing else.

Learn how to interact with sql2o - a Java library that enables database manipulation using an idiomatic language.

A quick tutorial on finding the minimum and maximum values in a multi-dimensional array in Java.

Explore the definition of the kernel in OS.

Learn how to use pkill, killall, and other tools for killing processes in Linux.

Learn about PCollections, a Java library providing persistent, immutable collections.

Learn what ad hoc means in programming.

A quick and practical overview of all reference types in Java.

Explore the theoretical foundation of support vector machines.

Learn how to sort number arrays as well as string arrays in Bash.

A couple of write-ups on the JEP-355 Text Blocks preview proposal for Multiline String Literals in Java 13, and an introduction to JPA/Hibernate query hints.

Learn ways to keep track of the values returned by process monitoring tools like top.

Java 21, monkey patching with Java, high-performant records, 12-factor apps, OpenJDK migrations, and real-time applications!

Learn how we can download email attachments using the JavaMail API

Learn about the Token-Based string similarity metrics.

There is a buffer between piped processes on Linux. We look at how it works and how to reconfigure it.

Learn how to find the next higher number with the same set of digits as the original number in Java.

This article explains how to run different scripts sequentially and also how to stop and resume in foreground and background.

Learn about the differences between the MVC and MVP Patterns.

A quick and practical introduction to generic programming in Scala using the shapeless library

Learn about Kotlin annotations and their Java counterparts.

Learn about RBFs and their use in artificial neural networks.

Explore various techniques for isolating unique email addresses from a Java list.

Learn how to manage user IDs in Linux.

Looking for a Java Lead with Spring experience to join the Baeldung team.

Discover what Buffer Overflow is and the threats it poses to our system.

A quick and practical overview of securing our Spring applications against enumeration attacks.

A quick and practical guide to REST testing with JBehave

I'm a software engineer who loves technology challenges. I specialize in Java/Spring, Databases (Relational/NoSQL), Cloud/AWS, Microservices, scalable/secure...

Learn about Apache Iceberg, a popular open table format in today's big data landscape.

Learn how to test Apache Camel routes in Spring Boot.

Learn about physical and virtual memory and why we need these two separate entities

Learn about network processes and why they might seem to lack a PID.

A quick and practical overview of File IO in Scala.

Learn about early stopping.

Learn how actors can be discovered or found using Akka.

Learn how the CORS policy is implemented in browsers and why we have preflight requests

Learn how to send a password via SSH or SCP using subprocess.Popen in Linux.

Java 12 has been out of just a few weeks and packing some really cool functionality. We're looking at the enhanced switch this week - highly useful.

Learn about principal component analysis and how to use it to reduce the dimensionality of a dataset and discover its principal aspects.

A quick and practical explanation of differences between tree depth and height.

Learn how to find the number of subsequences of a string

Learn how to use a Kafka producer to add custom headers in a Kafka message.

Learn how to use the rsyslog service to log every command a user executes in Linux.

Understand better how nested and inner classes work in Kotlin

Learn what the Java Number class does and what methods it contains.

Learn how to configure the mailer type in Postfix, and what each option entails.

I am a software developer and a DevOps Engineer with hands-on experience in Core Java, Restful web services for mobile applications. Developing microservice...

Learn how to count words in a file.