Spring Boot

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Spring Boot Structured Logging in JSON Format Example

Since version 3.4, Spring Boot will provide native support for structured logging in the most common and popular formats, such as JSON and XML.

[Solved] CommandAcceptanceException: Error executing DDL

1. Problem When writing tests that depend on H2 database in a Spring boot application, we may encounter the CommandAcceptanceException: Error executing DDL. The root cause exception will be org.h2.jdbc.JdbcSQLSyntaxErrorException in the logs. The exception stack trace will look something like this: If you are trying to run unit tests …

Spring Boot MVC REST Controller Example & Unit Tests

Learn to create a REST API controller using @RestController in a Spring Boot application, and add method validation, error handling and unit tests.

Spring Boot JpaRepository Example

Learn to Spring Data JPA module and work with JpaRepository interface for performing the CRUD operations in underlying databases in a Spring Boot application.

Spring Boot REST API for Excel File Download

Learn to write Spring Boot RESTs that help in downloading the Excel files (.xlsx) either stored in the server or generating and then sending it.

Spring Boot MVC Exception Views: Custom Error Pages

Learn to create generic and custom error pages for specific HTTP error codes in a Spring Boot application with configuration examples.

Spring Boot @Import and @ImportResource Examples

By leveraging Spring @Import and @ImportResource annotations, we can create more modular, maintainable, and flexible Spring Boot applications.

Different Ways to Load Property Files in Spring Boot

Spring Boot provides various ways to load property files such as default application.properties, spring profiles, custom property files, environment variables, and system properties.

Creating and Building a Spring Boot Project with Gradle

Learn to create a Spring Boot project with Gradle from scratch, configure the build script, create a Spring Boot application class, and run the application.

Spring Boot Transaction-Aware Caching Example

In Spring tutorial explores transaction-aware caching using transactionAware property and TransactionAwareCacheManagerProxy class with example.

Run a Spring Boot and Postgres Application on Podman

This guide explores the step-by-step process of containerization and running a Spring Boot application with PostgreSQL database using Podman.

Spring Boot REST API Timeout (with Examples)

Learn to handle REST API timeouts on the server side using Spring boot MVC async, Resilience4j, @Transactional, RestTemplate and WebClient with examples.

Displaying Images with Thymeleaf and Spring Boot

Learn to display images from different sources (e.g., resources directory or database) using the Thymeleaf view templates in a Spring Boot application.

Spring Boot Hello World Example: Beginners Guide

Spring Boot is an open-source framework that simplifies the development of stand-alone, production-grade Spring-based MVC applications and microservices.

Creating a Jasper Report with Spring Boot

Learn to create Jasper reports in a Spring boot application, step by step, by configuring JasperReport library, loading the report templates, fill the data into reports and finally export the filled reports into a variety of formats.

Spring Boot and Kafka Streams Example

Learn to create a Kafka Streams application using Spring Boot. Also, learn about Topology and Processor and unit test the topology design.

Spring Boot File Upload REST API Example

Learn to write a REST API in Spring Boot that can handle single file and multiple file uploads. Also learn to validate the file sizes and types.

Spring Boot Logging Levels Example

Learn to configure the logging levels for different packages and classes in a Spring boot application using properties, YAML and XML configurations.

Spring Boot REST API Example – Step-by-Step Guide

Learn to build REST APIs in a Spring boot application with request validation, error handling, testing and API documentation with examples.

Apache Kafka using Spring Boot

Learn to configure Spring boot application and Apache Kafka Producer, and Consumer, handle Kafka errors and retry in case of failures.

Spring Boot REST API for Long-Running Tasks

Learn to design and implement a Spring Boot REST API that accepts long-running tasks and publishes the execution progress to a Kafka topic.

OpenAI ChatGPT APIs using Spring Boot

Learn to call OpenAI ChatGPT APIs in Spring Boot RestTemplate or WebClient with an example. Also, log the requests and responses for debugging.

Spring Boot App Automatically Closes with Exit Code 0

Learn the most common solutions for the Spring boot application closing automatically after start, with exit code 0 and no exceptions logs.

Spring Boot @ServiceConnection

Since Spring Boot 3.1, @ServiceConnection is used to provide connection details to a remote service that takes precedence over details in the properties file.

Spring Boot Docker Compose Example

Learn to use Spring boot docker compose module, customize the compose file and container lifecycle with an example.

DynamoDB with Spring Cloud AWS DynamoDbTemplate

Learn to use integrate DynamoDB using Spring-cloud-aws module and its DynamoDbTemplate and DynamoDbEnhancedClient beans with examples.

Deploy a Spring Boot App to AWS Elastic Beanstalk

Step by step, we will learn to deploy a Spring Boot application to AWS Elastic Beanstalk which uses RDS for persisting the records in the database.

Deploy a Dockerized Spring Boot App to AWS

By combining the portability and flexibility of Docker containers with AWS’s reliable and scalable infrastructure, we can take our Spring Boot applications to new heights. In this comprehensive guide, we’ll show exactly how to deploy a Dockerized Spring Boot app to AWS ECS from start to finish. 1. Introduction to …

Spring Boot, Keycloak and TestContainer Example

Learn to use the test container library (KeycloakContainer) to start keycloak server as a docker container while unit testing with JUnit and Spring boot.

OAuth2 Login with Keycloak and Spring Boot Security 3

This Spring security tutorial discusses using Keycloak and Spring Security OAuth2 to implement token-based authentication in a spring boot app.

Spring Boot @RateLimiter and @Bulkhead with Resilience4j 2

Learn to configure bulkhead and rate limiting using Resilience4j 2 in a Spring boot 3 application, and testing with Apache JMeter.

Spring Boot REST – Handling XML Request and Response

Spring boot, by default, configures Jackson for parsing objects to JSON. We can use Jackson’s XML module or JAXB to configure the XML support.

Load Initial Data with SQL Scripts in Spring Boot

Learn to execute SQL scripts to load data (e.g. import.sql, schema.sql or data.sql) during startup of a Spring boot application or tests.

DynamoDB with Spring Boot

Learn to access DynamoDB from a Spring Boot app and perform CRUD, batch and transaction operations using DynamoDBMapper or JPA Repository.

Vue.js CRUD Application with Spring Boot

Learn to create an application from scratch using REST APIs created with Spring boot and the user interface created with Vue.js. We will build a simple employee management application with Create, Read, Update, and Delete (CRUD) functionality. 1. Application Overview In the application, the home screen will present a list …

[Solved] Spring Boot H2 – Schema not found

Learn to solve the ‘JdbcSQLSyntaxErrorException schema not found’ error in a Spring boot app that uses the H2 database for CRUD operations.

Configure Multiple DataSources in Spring Boot

In this post, we will learn how to configure and manage multiple datasources using properties configuration and defining custom beans using Java annotations in Spring Boot. Note that this requirement differs from having separate datasource in test, dev and prod environments. Here, we are using multiple datasources in the same …

Why and How to use SpringBootServletInitializer?

Learn the internal working of SpringBootServletInitializer and how to use it to deploy a Spring Boot application to an external server.

Spring Boot Multiple File Uploads with React

Learn to Spring Boot API to accept multiple file uploads, store in a folder, save file details in database and build a React UI to interact.

Spring Boot – Separate DataSource for Test, Dev and Prod

Learn to configure and use different DataSource in different environments (test, development, production etc.) using the Spring profile specific properties files, as well as Java configuration in a Spring boot application. 1. Introduction A production grade application is deployed and tested in different environments before finally released to the end-user. …

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