Learn how to inser a new row between two rows in an Excel file using the Apache POI library
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Converting java.util.Properties to HashMap
Filed under Java Collections
Let’s see how we can convert java.util.Properties into a HashMap<String, String>.
Java Weekly, Issue 374
Filed under Weekly Review
Streaming options, initializing testcontainers, faster charset decoding, DDD in Java, GraphQL microservices, and recipes for being an enabler manager!
REST API: JAX-RS vs Spring
Filed under Jakarta EE, REST, Spring
In this tutorial, we’ll see the difference between JAX-RS and Spring MVC for REST API development.
Write Extracted Data to a File Using JMeter
Filed under Testing
Sometimes we need to write our JMeter test data into a file. Let’s explore how we can do that.
Where Does Java’s String Constant Pool Live, the Heap or the Stack?
Filed under Java
Learn about the storage area for String constant pool.
Override Maven Plugin Configuration from Parent
Filed under Maven
While we want to modularise our maven file to avoid repetition, sometimes it’s necessary to provide specific variations for child modules. Here we explain how the various tiers of a maven file can be combined.
How To Configure Java Heap Size Inside a Docker Container
Filed under DevOps
To run Java in a docker container we may need to set the correct memory allocation settings, or use a JVM which is aware that it is running in a container. We discover how to optimise a docker build for our Java application’s memory.
Configuring Message Retention Period in Apache Kafka
Learn how to configure time-based message retention properties for Kafka topics
Java Weekly, Issue 373
Filed under Weekly Review
Maven central security, breaking a monolith, quarkus testing, more efficient Md5, introducing latency in SQL queries, and chaos engineering!
File Upload With Open Feign
Filed under REST, Spring Cloud
Learn how to implement a Multipart File upload using OpenFeign.
Prevent Cross-Site Scripting (XSS) in a Spring Application
Filed under Spring Security
When writing a web service in Spring we need to create a custom filter in order to protect our services from cross-site scripting attacks. We explore how to achieve this using ESAPI and Jsoup.
Java Weekly, Issue 372
Filed under Weekly Review
Java 16 goes RC1, Unix-domain sockets, native images, jOOQ internals, metrics meets open tracing, joining tables with a hash-join algorithm, and having more effective meetings!
Java HashMap Load Factor
Filed under Java Collections
In this article, we’ll see the significance of the load factor in Java’s HashMap and how it affects the map’s performance.
Java Weekly, Issue 371
Filed under Weekly Review
Experimenting with Unix-domain sockets, more randomness, Java on Java, vectorization, the benefits of pull requests, and the story of Netflix’s homepage!
Multiple Submit Buttons on a Form
Filed under Spring MVC
Learn how to add another button to the same form in a Spring MVC application that maps to the same RequestMapping on the controller.
Using the Map.Entry Java Class
Filed under Java Collections
We often use maps to store a collection of key-value pairs. We explore the Entry objects inside a map and how to make the most of them.
Java Weekly, Issue 370
Filed under Weekly Review
Java turns 25, interview with Brian Goetz, scalable batching processing, more pattern matching, foreign memory access, idempotent consumers, and latency numbers for teams!
An Introduction to the Constant Pool in the JVM
Filed under Java
Learn about the constant pool in JVM.
Structural Patterns in Core Java
Filed under Java
Learn how some core libraries in Java have adopted the seven core structural design patterns