java – PolarSPARC

Pragmatic Bytes on Spring AI

In this article, we will provide an overview of the Spring AI framework that went GA in May 2025 and get our hands dirty with some code samples on the various core capabilities of the framework in combination with Spring Boot.

Here is the link to the article on Spring AI:

Pragmatic Bytes on Spring AI

Enjoy 🙂 !!!

Quick Primer on Java Method Handles

This article demonstrates how one can use Method Handles from Java – a better Java reflection mechanism.

Here is the link to the article introducing Method Handles in Java:

Quick Primer on Java Method Handles

Enjoy 🙂 !!!

Dynamic Code Generation using Java Compiler API

In this article, we will demonstrate how one can extend the business logic of a Java application, at runtime, by dynamically compiling and loading the class bytecode using the Java Compiler API.

Here is the link to the article on how one can use the Java Compiler API for dynamic code generation:

Dynamic Code Generation using Java Compiler API

Enjoy 🙂 !!!

Introduction to Scripting In Java

This article demonstrates how one can externalize business logic in JavaScript and use the Nashorn engine to execute that business logic at runtime.

Here is the link to the article introducing Scripting in Java:

Introduction to Scripting In Java

Enjoy 🙂 !!!

The JVM ‘Invoke…’ Instructions

Ever taken a peek at the Java bytecode of a class to see what is really going on under-the-hood especially with the various method calls ???

There are five different JVM method invocation instructions and they come into play at different scenarios. Here is the link to the article introducing the various JVM ‘invoke…‘ instructions:

The JVM ‘Invoke…’ Instructions

Enjoy 🙂 !!!

Introduction to Apache Calcite

Ever wondered what is the common ingredient behind some of the most popular Big data frameworks, such as Apache Drill, Apache Druid, Apache Flink, Apache Phoenix, Dremio, and others ???

Apache Calcite is a popular open source Java framework for building and managing data sources using the SQL language. Here is the link to the article introducing Apache Calcite:

Introduction to Apache Calcite

Enjoy 🙂 !!!

Introduction to Byte Buddy

Ever wondered what is the one common powerful “ingredient” between two popular Java frameworks Hibernate and Mockito ???

Byte Buddy is a popular Java code generation and manipulation library that is common between the two mentioned frameworks. Here is the link to the article introducing the Byte Buddy library:

Introduction to Byte Buddy

Enjoy 🙂 !!!

Virtual Threads in Java 21

Java 21 introduced some important language features and one of them is the Virtual Threads.

Here is the link to the article introducing Virtual Threads:

Virtual Threads in Java 21

Enjoy 🙂 !!!

Introduction to Bytecode Handling with ASM

ASM is a powerful low-level Java library for manipulating the Java bytecode. Here is the link to the article introducing the ASM Framework:

Introduction to Bytecode Handling with ASM

Enjoy 🙂 !!!

Exploring Kafka Streams :: Part 7

In Part-7 (FINAL) of this series, we will explore the different Stream Joining techniques in Kafka Streams. We will implement and demonstrate the concepts using a simple application in Java. Here is the link to the article:

Exploring Kafka Streams :: Part 7

Enjoy 🙂 !!!