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Spring Boot Virtual Threads and HikariCP: Why Your Pool Runs Dry

You turn on virtual threads in Spring Boot, run a load test, and the logs fill up with this: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection at org.springf

gowthammuthuvel.hashnode.dev

Waqas Shahid3d ago · 2 min read

Spring Boot Explained: Java Backends Without the Boilerplate

Introduction Java powers a huge share of enterprise backends, and Spring is its dominant framework, but classic Spring was famous for sprawling XML configuration before a single endpoint existed. Spri

practicaldevblog.hashnode.dev

Manikandan SOct 23 · 6 min read

TreeMap in Java

1. Introduction to TreeMap TreeMap is a Java class that implements the NavigableMap interface. It stores key-value pairs sorted by keys. Syntax TreeMap<KeyType, ValueType> map = new TreeMap<>(); Exam

manikandan4411.hashnode.dev

Manish ChavanOct 21 · 5 min read

Kafka in Spring Boot: Retries, Dead Letter Topics and Idempotent Consumers

Writing a Kafka consumer in Spring Boot takes about ten lines. Making it survive real traffic takes a lot more thought. In production you will see three kinds of problems again and again: Temporary f

manishchavan.hashnode.dev

Manish ChavanOct 21 · 5 min read

Designing a Reliable Integration Service in Spring Boot: From Webhook to Internal APIs

A common enterprise problem: data is collected in one system (an online form, a partner portal, a CRM), and a person copies it into several internal systems by hand. It's slow and full of typos. So yo

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Manish ChavanOct 21 · 5 min read

Observability in Spring Boot 3: Logs, Metrics and Traces with Micrometer and OpenTelemetry

In a microservices system, a single user request might touch five services and a Kafka topic. When something breaks, grep-ing through logs on five machines doesn't work. You need observability: Logs:

manishchavan.hashnode.dev

Manish ChavanOct 21 · 5 min read

Build a RAG Chatbot in Java with Spring AI and pgvector

Most AI tutorials are in Python. But if your company runs on Java and Spring Boot, you don't need to switch languages to add AI features. Spring AI gives you the same programming model you already kno

manishchavan.hashnode.dev

Manish ChavanOct 21 · 5 min read

Build Your First MCP Server with Spring Boot: Let AI Assistants Call Your Java APIs

AI assistants like Claude, ChatGPT and the AI features in IDEs are great at talking. They become really useful when they can do things: look up an order, check a deployment, query a database. The Mode

manishchavan.hashnode.dev

Manikandan SOct 21 · 5 min read

LinkedHashMap in Java

1. Introduction to LinkedHashMap LinkedHashMap is a Java class that implements the Map interface. It stores key-value pairs and maintains insertion order by default. Syntax LinkedHashMap<KeyType, Valu

manikandan4411.hashnode.dev

Manikandan SOct 19 · 6 min read

HashMap in Java

Introduction to HashMap HashMap is a Java class that implements the Map interface. It stores data as key-value pairs. Keys must be unique, but values can be duplicated. It does not guarantee insertion

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Spring Boot Virtual Threads and HikariCP: Why Your Pool Runs Dry

Spring Boot Explained: Java Backends Without the Boilerplate

TreeMap in Java

Kafka in Spring Boot: Retries, Dead Letter Topics and Idempotent Consumers

Designing a Reliable Integration Service in Spring Boot: From Webhook to Internal APIs

Observability in Spring Boot 3: Logs, Metrics and Traces with Micrometer and OpenTelemetry

Build a RAG Chatbot in Java with Spring AI and pgvector

Build Your First MCP Server with Spring Boot: Let AI Assistants Call Your Java APIs

LinkedHashMap in Java

HashMap in Java