All Articles
All 173 Spring Boot articles, newest first. Browse fundamentals, implementation guides, and troubleshooting in one place.
2026
- How to Test File Upload APIs Using MockMvc in Spring Boot - Testing Error Cases for Size Limits and MIME Validation with MockMultipartFile
- How to Unit Test Mappers in Spring Boot + MyBatis - Why @MybatisTest Doesn't Exist and Alternative Configurations with H2/Testcontainers
- How to Test File Download APIs with MockMvc in Spring Boot - Verifying Content-Disposition and Binary Responses
- How to Implement a Second-Level Cache with @CacheNamespace in Spring Boot + MyBatis - cache Tag and Redis Integration
- How to Load Test Data in Spring Boot Tests Using the @Sql Annotation
- How to Use @NamedEntityGraph in Spring Data JPA - Reusable Fetch Definitions and Choosing Between EntityGraph.Type
- HikariCP Pool Sizing for Multiple DataSources in Spring Boot
- How to Resolve Multiple Beans of the Same Type in Spring Boot - Using @Qualifier and @Primary and Name Resolution Priority
- How to Test @RestControllerAdvice Exception Handlers Using MockMvc in Spring Boot - Verifying Status Codes and ProblemDetail
- Spring Boot + MyBatis Polymorphic Mapping with discriminator - resultMap Implementation to Branch a Single Table by Type
- How to Implement Optimistic Locking in Spring Boot + MyBatis
- When Should You Use BeanNameAware and ApplicationContextAware in Spring Boot?
- How to Detect and Debug HikariCP Connection Leaks in Spring Boot - leakDetectionThreshold and Thread Dump Analysis
- How to Introduce baselineOnMigrate for an Existing Database with Spring Boot + Flyway - Initializing baselineVersion and flyway_schema_history
- Spring Boot + MyBatis: How to Build Dynamic SQL with Java Code Only Using SqlProvider
- How to Monitor HikariCP Connection Pool with Micrometer and Actuator in Spring Boot
- Spring Boot @SpringBootTest webEnvironment Guide - Choosing Between MOCK, RANDOM_PORT, DEFINED_PORT, and NONE
- How to Split and Externalize Configuration Files with Spring Boot's spring.config.import
- How to Fix NoSuchBeanDefinitionException with @ComponentScan in Spring Boot - Configuring Multi-Module Setups and Scan Scope
- How to Retrieve the Auto-Generated ID (AUTO_INCREMENT) After INSERT with Spring Boot + MyBatis
- How to Display CI/CD Version Information in Spring Boot Actuator - Automatically Reflect Commit Hashes in /actuator/info with build-info and git.properties
- How to Bulk Import CSV in Spring Batch - Chunk Processing with FlatFileItemReader and BeanWrapperFieldSetMapper
- How to Fix "Validate failed" / "checksum mismatch" in Spring Boot + Flyway - flyway repair and Production Recovery Steps
- How to Test JSON Serialization/Deserialization in Spring Boot with @JsonTest - Validating JacksonTester and ObjectMapper
- How to Configure and Tune Caffeine Cache in Spring Boot - From expireAfterWrite and maximumSize to Production Operations with stats()
- How to Test Authentication-Required APIs with Spring Security and MockMvc - Choosing Between @WithMockUser and SecurityMockMvcRequestPostProcessors
- How to Reuse SQL in Spring Boot + MyBatis Using sql and include Tags - Eliminating Query Duplication Across Mappers
- Why HikariCP Fails to Connect When Scaling Spring Boot to Multiple Replicas on Kubernetes - Reverse-Engineering maximumPoolSize from the DB's max_connections
- What is MyBatis? Understanding the Differences from JPA and a Minimal Spring Boot Setup
- How to Write Real HTTP E2E Tests in Spring Boot with @SpringBootTest(RANDOM_PORT) and TestRestTemplate
- How to Implement Transaction Management with @Transactional in Spring Boot + MyBatis - The Mechanism of SqlSession and DataSourceTransactionManager
- Spring Boot + MyBatis: Causes and Fixes for "Invalid bound statement (not found)" and "Parameter 'xxx' not found"
- Dynamic SQL in Spring Boot + MyBatis: How to Write where, set, trim, choose, bind, and foreach, and How to Fix "Leading AND Left Behind", "Trailing Comma", and "Empty IN Clause Crashes"
- How to Map One-to-Many and Many-to-One Join Results with Spring Boot + MyBatis - resultMap association/collection and N+1 Countermeasures
- Causes and Fixes for HikariCP "Failed to validate connection" and "Connection is closed" in Spring Boot - How to Decide maxLifetime and keepaliveTime
- How to Tune Embedded Tomcat Thread Count in Spring Boot - Deciding server.tomcat.threads.max, max-connections, and accept-count
- How to Connect Spring Boot to MySQL - application.yml Configuration, JDBC URL Parameters, and Time Zone/Character Encoding Pitfalls
- How to Implement Pagination with Spring Boot + MyBatis - Choosing Between PageHelper, RowBounds, and Hand-Written LIMIT/OFFSET
- Mastering Mockito in Spring Boot Service Layer Tests - when, verify, ArgumentCaptor, and doThrow in Practice
- How to Validate List<DTO>, @RequestParam, and @PathVariable in Spring Boot - Why @Valid Doesn't Work and How to Handle the 3 Exceptions
- Spring Boot Validation Annotations Cheat Sheet - From the Differences Between @NotNull/@NotEmpty/@NotBlank to Custom Messages
- Which Spring Boot Authentication Method Should You Choose? Comparing Session, JWT, OAuth2, and API Key with a Selection Flowchart
- Spring Boot Test Annotations Cheat Sheet - How to Choose Between @SpringBootTest, @WebMvcTest, and @DataJpaTest
- Why @Transactional, @Cacheable, and @Async Don't Work in Spring Boot - Understanding AOP Proxies and Self-Invocation to Fix It
- How to Use the @Query Annotation in Spring Boot + Spring Data JPA - From JPQL and Native SQL to Update Queries with @Modifying
- How to Implement Session Management with Spring Session + Redis in Spring Boot - Sharing Sessions Across Multiple Instances
- Differences Between @Service, @Repository, and @Controller in Spring Boot and How to Use Them - From Their Relationship with @Component to Exception Translation
- How to Use Quartz Scheduler in Spring Boot - Persistent Jobs, Cron, and Dynamic Scheduling (When to Use It vs. @Scheduled)
- How to Speed Up Bulk INSERTs with Spring Data JPA - hibernate.jdbc.batch_size and Batching saveAll
- Implementing Database Authentication with Spring Security - Persisting Users with UserDetailsService and JdbcUserDetailsManager
- How to Use MyBatis with Spring Boot - Implementation Guide for Mapper Definitions, Dynamic SQL, and Result Mapping
- How to Persist enums to a Database with Spring Boot + JPA - Choosing Between @Enumerated(EnumType.STRING) and AttributeConverter
- How to Implement gRPC Services and Clients in Spring Boot - Protocol Buffers and grpc-spring-boot Support
- @MockBean Deprecated in Spring Boot 3.4 - Migrating to @MockitoBean and @MockitoSpyBean and How to Use Them
- How to Automatically Record Change History (Audit Logs) with Spring Boot + Hibernate Envers
- How to Build an API Gateway with Spring Cloud Gateway - Routing, Filters, and Rate Limiting
- How to Export and Import CSV in Spring Boot - Handling Character Encoding, Large Datasets, and Validation with OpenCSV
- How to Create Your Own Custom Starter in Spring Boot - AutoConfiguration and Metadata Setup
- How to Fix LazyInitializationException in Spring Boot + JPA - Causes and Solutions for "could not initialize proxy - no Session"
- How to Create Custom Health Checks (HealthIndicator) and Custom Actuator Endpoints in Spring Boot