Java
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Multitenant Spring Authorization Server
Modern SaaS platforms often serve multiple customers (tenants) using a single deployment. Each tenant may require isolated OAuth2 clients, users,…
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Google Agent Development Kit Java Example
Building intelligent, tool-enabled AI systems in Java requires more than sending prompts to a language model. A well-structured implementation must…
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Renaming Fields in Elasticsearch Mappings
In Elasticsearch, index mappings define the structure and data types of fields stored in an index. Once a field is…
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Sending Emails Through Microsoft Exchange Server
Microsoft Exchange Server is widely used in enterprise environments for managing emails, calendars, and contacts. Applications often need to send…
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How to Run Only Specific Tests in TestNG
TestNG is a powerful testing framework for Java that provides many options to organize and execute tests. Sometimes, you may…
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Finding the Index of an Element in a LinkedHashSet Without Iteration
Each collection in the Java Collections Framework is designed with specific guarantees and limitations. A LinkedHashSet is often selected when…
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Kafka 4.0 & KRaft: The End of ZooKeeper
After 14 years and 100,000+ lines of code, Apache Kafka finally cuts the cord. Here’s everything that changed, and what…
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Java jCIFS Samba File Access Example
In many enterprise environments, files are shared across systems using the SMB/CIFS protocol (commonly implemented by Samba on Linux). Java…
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C++’s RAII Pattern: Why Destructors Became the Foundation of Resource Management
In 1984, Bjarne Stroustrup faced a problem that would define C++ for decades to come: how do you manage resources…
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