Configuring Multiple Data Sources in Spring Boot To support heterogeneous database access—such as reading from both MySQL and PostgreSQL—Spring Boot applications can be configured with multiple data sources using dynamic routing. Dependency Setup Add the following dependencies to pom.xml: <depend...
Protocol Fundamentals WebSocket defines a standardized method for opening persistent, bidirectional channels over a single Transmission Control Protocol (TCP) socket. After an initial negotiation phase, both the client and backend can independently exchange data streams without adhering to tradition...
Redis Connection Factory Configuration Spring Boot 2.x introduces significant changes to Redis auto-configuration. The Jedis client setup requires explicit bean definitions with updated APIs. Required Dependency <dependency> <groupId>org.springframework.boot</groupId> <artifactI...
Spring is an open-source, full-stack Java framework centered around inversion of control and aspect-oriented programming. While its foundational abstractions are applicable across any Java application, Spring has evolved extensively to support enterprise web development—largely supplanting legacy EJ...
When developing client applications that need to transmit collections of data to a server endpoint, utilizing an HTTP POST request is the standard approach. Specifically, scenarios involving batch operations often require sending an array of identifiers or objects. To handle this on the client side...
Windows Environment Setup MinIO is a lightweight, high-performance object storage system written in Go. It provides an S3-compatible API and is suitable for local deployments or on-premise infrastructure. Local Installation Download the windows-amd64 executable from the official repository. Place mi...
Unit Test Template @RunWith(SpringRunner.class) //@SpringBootTest(classes = PersonConfig.class) @ContextConfiguration(classes = PersonConfig.class) class Test { @Resource private PersonEventService personEventService; @Test public void test() { // ApplicationContext context = new AnnotationConfigApp...
System Initialization Initialize product inventory in Redis for caching: @RestController public class FlashSaleController { @Autowired private RequestAggregatorService aggregator; @Autowired private RedisTemplate<String, Object> cache; @PostMapping("/purchase") public ApiResponse pro...
When running test classes in a Spring Boot application with WebSocket integration, you may encounter the error: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverEndpointExporter' Invocation of init method failed; nested exception is java.lang.IllegalState...
Project Hierarchy . ├── acme-utils │ ├── build.gradle.kts │ └── src ├── acme-domain │ ├── build.gradle.kts │ └── src ├── acme-repository │ ├── build.gradle.kts │ └── src ├── acme-security │ ├── build.gradle.kts │ └── src ├── acme-app-runner │ ├── build.gradle.kts │ └── src ├── buildSrc │ ├── build │...