Harpal Singh

This guide explains how to create a Retrieval-Augmented Generation (RAG) chatbot using Spring AI and Vaadin. It covers project setup, application configuration, backend and frontend development, document parsing with TikaDocumentReader, embedding generation with OpenAI, and storage in PostgreSQL using PGvector. It also shows how to build a chat interface for interacting with uploaded documents.

Learn how to use the @Scheduled annotation in Spring with cron expressions.

Learn to configure multiple data sources in a Spring Boot application, enabling the use of separate databases and specific data sources for Spring Data JPA repositories.

Learn how to use testcontainers in a Spring boot application when creating integration tests.

Learn how to access values defined in a properties file in a Spring Boot application. Define properties in a properties file and access them in a Spring service.

Learn how to return HTTP 4XX errors in Spring applications. Use ResponseEntity to set the appropriate HTTP status code and response body.

Learn how to configure the server port for a Spring Boot application. Set the port in the application.properties file, command-line arguments, or system properties.

Learn how to configure a Java Web Client for HTTPS requests. Secure your HTTP communication with encryption to protect user data.

Learn how to implement retryable calls using RestClient with the support of spring-retry. Handle temporary failures in making HTTP requests systematically.

Learn how to run PostgreSQL in a Docker container with this step-by-step tutorial. Leverage Docker for easy setup and portability of your PostgreSQL database.