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Spring Boot 169 articles
- 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
Java 21 articles
- Spring Boot + MyBatis: How to Build Dynamic SQL with Java Code Only Using SqlProvider
- Spring Boot Validation Annotations Cheat Sheet - From the Differences Between @NotNull/@NotEmpty/@NotBlank to Custom Messages
- How to Use the @Query Annotation in Spring Boot + Spring Data JPA - From JPQL and Native SQL to Update Queries with @Modifying
- How to Use MyBatis with Spring Boot - Implementation Guide for Mapper Definitions, Dynamic SQL, and Result Mapping
- How to Export and Import CSV in Spring Boot - Handling Character Encoding, Large Datasets, and Validation with OpenCSV
- How to Run Startup Logic with CommandLineRunner and ApplicationRunner in Spring Boot
JPA 20 articles
- How to Use @NamedEntityGraph in Spring Data JPA - Reusable Fetch Definitions and Choosing Between EntityGraph.Type
- What is MyBatis? Understanding the Differences from JPA and a Minimal Spring Boot Setup
- How to Use the @Query Annotation in Spring Boot + Spring Data JPA - From JPQL and Native SQL to Update Queries with @Modifying
- How to Persist enums to a Database with Spring Boot + JPA - Choosing Between @Enumerated(EnumType.STRING) and AttributeConverter
- How to Automatically Record Change History (Audit Logs) with Spring Boot + Hibernate Envers
- How to Retrieve DTOs Directly with Spring Data JPA Projections - Choosing Between Interface-Based and Class-Based Projections
REST API 20 articles
- How to Implement Pagination with Spring Boot + MyBatis - Choosing Between PageHelper, RowBounds, and Hand-Written LIMIT/OFFSET
- How to Validate List<DTO>, @RequestParam, and @PathVariable in Spring Boot - Why @Valid Doesn't Work and How to Handle the 3 Exceptions
- How to Receive Request Parameters in Spring Boot - Choosing Between @RequestParam, @PathVariable, @RequestBody, and @ModelAttribute
- How to Export and Read Excel Files in Spring Boot - Implementing Reports and Data Import with Apache POI
- Customizing JSON Serialization with Jackson in Spring Boot - A Guide to Dates, Null Exclusion, and snake_case Support
- Implementing Spring Boot's GlobalExceptionHandler for Production Use
Spring Security 16 articles
- How to Test Authentication-Required APIs with Spring Security and MockMvc - Choosing Between @WithMockUser and SecurityMockMvcRequestPostProcessors
- Which Spring Boot Authentication Method Should You Choose? Comparing Session, JWT, OAuth2, and API Key with a Selection Flowchart
- How to Implement Session Management with Spring Session + Redis in Spring Boot - Sharing Sessions Across Multiple Instances
- Implementing Database Authentication with Spring Security - Persisting Users with UserDetailsService and JdbcUserDetailsManager
- How to Implement JWT Refresh Tokens with Spring Security
- Understanding Spring Security CSRF Protection Correctly - Configuration Differences Between REST APIs and Web Apps
Testing 16 articles
- 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 Load Test Data in Spring Boot Tests Using the @Sql Annotation
- Spring Boot @SpringBootTest webEnvironment Guide - Choosing Between MOCK, RANDOM_PORT, DEFINED_PORT, and NONE
- How to Test JSON Serialization/Deserialization in Spring Boot with @JsonTest - Validating JacksonTester and ObjectMapper
MyBatis 15 articles
- How to Unit Test Mappers in Spring Boot + MyBatis - Why @MybatisTest Doesn't Exist and Alternative Configurations with H2/Testcontainers
- How to Implement a Second-Level Cache with @CacheNamespace in Spring Boot + MyBatis - cache Tag and Redis Integration
- 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
- Spring Boot + MyBatis: How to Build Dynamic SQL with Java Code Only Using SqlProvider
- How to Retrieve the Auto-Generated ID (AUTO_INCREMENT) After INSERT with Spring Boot + MyBatis
Data Access 12 articles
- How to Implement a Second-Level Cache with @CacheNamespace in Spring Boot + MyBatis - cache Tag and Redis Integration
- How to Use @NamedEntityGraph in Spring Data JPA - Reusable Fetch Definitions and Choosing Between EntityGraph.Type
- Spring Boot + MyBatis Polymorphic Mapping with discriminator - resultMap Implementation to Branch a Single Table by Type
- What is MyBatis? Understanding the Differences from JPA and a Minimal Spring Boot Setup
- How to Map One-to-Many and Many-to-One Join Results with Spring Boot + MyBatis - resultMap association/collection and N+1 Countermeasures
- How to Implement Pagination with Spring Boot + MyBatis - Choosing Between PageHelper, RowBounds, and Hand-Written LIMIT/OFFSET
Spring Data JPA 12 articles
- How to Use @NamedEntityGraph in Spring Data JPA - Reusable Fetch Definitions and Choosing Between EntityGraph.Type
- How to Use the @Query Annotation in Spring Boot + Spring Data JPA - From JPQL and Native SQL to Update Queries with @Modifying
- How to Speed Up Bulk INSERTs with Spring Data JPA - hibernate.jdbc.batch_size and Batching saveAll
- How to Persist enums to a Database with Spring Boot + JPA - Choosing Between @Enumerated(EnumType.STRING) and AttributeConverter
- How to Fix LazyInitializationException in Spring Boot + JPA - Causes and Solutions for "could not initialize proxy - no Session"
- How to Retrieve DTOs Directly with Spring Data JPA Projections - Choosing Between Interface-Based and Class-Based Projections
Dependency Injection 10 articles
- How to Resolve Multiple Beans of the Same Type in Spring Boot - Using @Qualifier and @Primary and Name Resolution Priority
- When Should You Use BeanNameAware and ApplicationContextAware in Spring Boot?
- Differences Between @Service, @Repository, and @Controller in Spring Boot and How to Use Them - From Their Relationship with @Component to Exception Translation
- Thorough Comparison of Spring Boot's 3 Dependency Injection Methods - When to Use Constructor, Setter, and Field Injection
- How to Reduce Boilerplate Code with Lombok in Spring Boot
- Understanding Spring Boot Bean Scopes - When to Use singleton, prototype, request, and session
Actuator 9 articles
- How to Monitor HikariCP Connection Pool with Micrometer and Actuator in Spring Boot
- 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 Tune Embedded Tomcat Thread Count in Spring Boot - Deciding server.tomcat.threads.max, max-connections, and accept-count
- How to Create Custom Health Checks (HealthIndicator) and Custom Actuator Endpoints in Spring Boot
- How to Speed Up Spring Boot Application Startup - Reducing Time with CDS, AOT, and Lazy Initialization
- How to Properly Configure and Tune HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
Microservices 9 articles
- How to Implement gRPC Services and Clients in Spring Boot - Protocol Buffers and grpc-spring-boot Support
- How to Build an API Gateway with Spring Cloud Gateway - Routing, Filters, and Rate Limiting
- Implementing the Transactional Outbox Pattern in Spring Boot
- How to Implement Distributed Transactions in Microservices with the Saga Pattern in Spring Boot
- How to Implement Declarative External API Calls with OpenFeign in Spring Boot
- Implementing Kafka Producer and Consumer in Spring Boot - Beginner's Guide with Sample Code
Troubleshooting 9 articles
- How to Detect and Debug HikariCP Connection Leaks in Spring Boot - leakDetectionThreshold and Thread Dump Analysis
- 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 Fix "Validate failed" / "checksum mismatch" in Spring Boot + Flyway - flyway repair and Production Recovery Steps
- Spring Boot + MyBatis: Causes and Fixes for "Invalid bound statement (not found)" and "Parameter 'xxx' not found"
- Causes and Fixes for HikariCP "Failed to validate connection" and "Connection is closed" in Spring Boot - How to Decide maxLifetime and keepaliveTime
Hikaricp 8 articles
- HikariCP Pool Sizing for Multiple DataSources in Spring Boot
- How to Detect and Debug HikariCP Connection Leaks in Spring Boot - leakDetectionThreshold and Thread Dump Analysis
- How to Monitor HikariCP Connection Pool with Micrometer and Actuator in Spring Boot
- Why HikariCP Fails to Connect When Scaling Spring Boot to Multiple Replicas on Kubernetes - Reverse-Engineering maximumPoolSize from the DB's max_connections
- 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
Architecture 7 articles
- When Should You Use BeanNameAware and ApplicationContextAware in Spring Boot?
- How to Fix NoSuchBeanDefinitionException with @ComponentScan in Spring Boot - Configuring Multi-Module Setups and Scan Scope
- How to Create Your Own Custom Starter in Spring Boot - AutoConfiguration and Metadata Setup
- Spring Boot Package Structure Best Practices - Choosing Between Layered and Feature-Based Approaches
- How to Achieve a Modular Monolith with Spring Modulith
- How to Implement Multi-Tenancy in Spring Boot
Database 7 articles
- How to Retrieve the Auto-Generated ID (AUTO_INCREMENT) After INSERT with Spring Boot + MyBatis
- Causes and Fixes for HikariCP "Failed to validate connection" and "Connection is closed" in Spring Boot - How to Decide maxLifetime and keepaliveTime
- How to Connect Spring Boot to MySQL - application.yml Configuration, JDBC URL Parameters, and Time Zone/Character Encoding Pitfalls
- Database Migration Management with Liquibase in Spring Boot
- How to Properly Configure and Tune HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
- Database Migration Management with Flyway in Spring Boot - A Guide from Version Control to Production Deployment
Junit 7 articles
- How to Unit Test Mappers in Spring Boot + MyBatis - Why @MybatisTest Doesn't Exist and Alternative Configurations with H2/Testcontainers
- How to Load Test Data in Spring Boot Tests Using the @Sql Annotation
- How to Test JSON Serialization/Deserialization in Spring Boot with @JsonTest - Validating JacksonTester and ObjectMapper
- How to Test Authentication-Required APIs with Spring Security and MockMvc - Choosing Between @WithMockUser and SecurityMockMvcRequestPostProcessors
- Spring Boot Test Annotations Cheat Sheet - How to Choose Between @SpringBootTest, @WebMvcTest, and @DataJpaTest
- How to Write Controller Unit Tests with MockMvc in Spring Boot - Introduction to @WebMvcTest
Mockmvc 7 articles
- How to Test File Upload APIs Using MockMvc in Spring Boot - Testing Error Cases for Size Limits and MIME Validation with MockMultipartFile
- How to Test File Download APIs with MockMvc in Spring Boot - Verifying Content-Disposition and Binary Responses
- How to Test @RestControllerAdvice Exception Handlers Using MockMvc in Spring Boot - Verifying Status Codes and ProblemDetail
- Spring Boot @SpringBootTest webEnvironment Guide - Choosing Between MOCK, RANDOM_PORT, DEFINED_PORT, and NONE
- How to Test Authentication-Required APIs with Spring Security and MockMvc - Choosing Between @WithMockUser and SecurityMockMvcRequestPostProcessors
- Spring Boot Test Annotations Cheat Sheet - How to Choose Between @SpringBootTest, @WebMvcTest, and @DataJpaTest
Performance 7 articles
- HikariCP Pool Sizing for Multiple DataSources in Spring Boot
- How to Tune Embedded Tomcat Thread Count in Spring Boot - Deciding server.tomcat.threads.max, max-connections, and accept-count
- How to Speed Up Bulk INSERTs with Spring Data JPA - hibernate.jdbc.batch_size and Batching saveAll
- How to Speed Up Spring Boot Application Startup - Reducing Time with CDS, AOT, and Lazy Initialization
- How to Properly Configure and Tune HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
- Spring Boot Virtual Threads (Java 21): Setup, Performance, and Pitfalls
Redis 7 articles
- How to Implement a Second-Level Cache with @CacheNamespace in Spring Boot + MyBatis - cache Tag and Redis Integration
- How to Implement Session Management with Spring Session + Redis in Spring Boot - Sharing Sessions Across Multiple Instances
- How to Write Integration Tests with PostgreSQL, Kafka, and Redis Using Spring Boot Testcontainers
- How to Implement JWT Refresh Tokens with Spring Security
- How to Implement Idempotency (Idempotency-Key) in a Spring Boot REST API - Preventing Double Charges and Double-Clicks
- How to Use Redis with Spring Boot - Implementation Patterns for Session Management, Caching, and Pub/Sub
Security 7 articles
- How to Implement API Rate Limiting in Spring Boot - Limiting Request Count with Bucket4j and Filter
- Understanding Spring Security CSRF Protection Correctly - Configuration Differences Between REST APIs and Web Apps
- How to Configure Spring Boot as an OAuth2 Resource Server - Implementing JWT Validation and Scope-Based Authorization
- How to Encrypt Sensitive Information in Configuration Files Using Jasypt with Spring Boot
- Spring Security Method Security - How to Implement RBAC with @PreAuthorize
- How to Implement Google Login (OAuth2) with Spring Boot
Validation 7 articles
- 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
- How to Validate Spring Boot @ConfigurationProperties with Bean Validation - A Fail Fast Implementation Guide for Detecting Configuration Errors at Startup
- How to Implement Internationalization (i18n) in Spring Boot - Using MessageSource and LocaleResolver
- How to Create Custom Validation Annotations in Spring Boot - @Constraint/ConstraintValidator Implementation Guide
- How to Implement Group Validation and Method Validation with Spring Boot's @Validated Annotation
Annotations 6 articles
- Differences Between @Service, @Repository, and @Controller in Spring Boot and How to Use Them - From Their Relationship with @Component to Exception Translation
- How to Implement Group Validation and Method Validation with Spring Boot's @Validated Annotation
- How to Implement Validation Simply with the Spring Boot @Valid Annotation - Usage and Error Handling
- What is @Configuration / @Bean in Spring Boot? Explaining the Difference from @Component and How to Use Them
- Spring Boot @Scheduled: Cron Jobs, fixedRate, and fixedDelay Explained
- What Is @Component in Spring Boot? Differences from @Bean and How to Use It
Bean 6 articles
- How to Resolve Multiple Beans of the Same Type in Spring Boot - Using @Qualifier and @Primary and Name Resolution Priority
- When Should You Use BeanNameAware and ApplicationContextAware in Spring Boot?
- Understanding Spring Boot Bean Scopes - When to Use singleton, prototype, request, and session
- Understanding Spring Boot Bean Lifecycle - How to Use @PostConstruct, @PreDestroy, and InitializingBean
- Spring @Bean "Name" Guide - When to Set It? How Does It Work? What's the Priority?
- What is @Configuration / @Bean in Spring Boot? Explaining the Difference from @Component and How to Use Them
Spring MVC 6 articles
- Differences Between @Service, @Repository, and @Controller in Spring Boot and How to Use Them - From Their Relationship with @Component to Exception Translation
- How to Receive Request Parameters in Spring Boot - Choosing Between @RequestParam, @PathVariable, @RequestBody, and @ModelAttribute
- Spring Boot REST API Versioning Strategies - Choosing Between URL Path, Header, and Content-Type
- Getting Started with Reactive Programming in Spring WebFlux - Differences from Spring MVC and When to Use Each
- Server-Side Rendering with Thymeleaf in Spring Boot: A Complete Guide to Forms, Validation, and Security Integration
- Difference Between Interceptor and Filter in Spring Boot - With Implementation Samples for Request Pre/Post Processing
Application Yml 5 articles
- How to Split and Externalize Configuration Files with Spring Boot's spring.config.import
- 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 Properly Configure and Tune HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
- How to Encrypt Sensitive Information in Configuration Files Using Jasypt with Spring Boot
Authentication 5 articles
- Which Spring Boot Authentication Method Should You Choose? Comparing Session, JWT, OAuth2, and API Key with a Selection Flowchart
- Implementing Database Authentication with Spring Security - Persisting Users with UserDetailsService and JdbcUserDetailsManager
- How to Implement JWT Refresh Tokens with Spring Security
- How to Implement Stateless Authentication with Spring Security + JWT
- Getting Started with Authentication in Spring Boot using Spring Security - From Basic Authentication to Form Authentication
Connection Pool 5 articles
- HikariCP Pool Sizing for Multiple DataSources in Spring Boot
- How to Detect and Debug HikariCP Connection Leaks in Spring Boot - leakDetectionThreshold and Thread Dump Analysis
- Why HikariCP Fails to Connect When Scaling Spring Boot to Multiple Replicas on Kubernetes - Reverse-Engineering maximumPoolSize from the DB's max_connections
- Causes and Fixes for HikariCP "Failed to validate connection" and "Connection is closed" in Spring Boot - How to Decide maxLifetime and keepaliveTime
- How to Properly Configure and Tune HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
Getting Started 5 articles
- Implementing REST API CRUD in Spring Boot - The Basic Controller, Service, and Repository Structure
- What is a Spring Boot Starter?
- What is Spring AOP? Explaining the Mechanism and Usage with Sample Code
- What Is DI (Dependency Injection) in Spring Boot? Mechanism, Syntax, and Benefits Explained [For Beginners]
- Why Is Spring Boot So Widely Used in Enterprise Application Development?
JWT 5 articles
- Which Spring Boot Authentication Method Should You Choose? Comparing Session, JWT, OAuth2, and API Key with a Selection Flowchart
- How to Implement JWT Refresh Tokens with Spring Security
- Understanding Spring Security CSRF Protection Correctly - Configuration Differences Between REST APIs and Web Apps
- How to Configure Spring Boot as an OAuth2 Resource Server - Implementing JWT Validation and Scope-Based Authorization
- How to Implement Stateless Authentication with Spring Security + JWT
Kubernetes 5 articles
- Why HikariCP Fails to Connect When Scaling Spring Boot to Multiple Replicas on Kubernetes - Reverse-Engineering maximumPoolSize from the DB's max_connections
- How to Create Custom Health Checks (HealthIndicator) and Custom Actuator Endpoints in Spring Boot
- How to Prevent Duplicate @Scheduled Execution in Distributed Environments with Spring Boot and ShedLock
- How to Achieve Graceful Shutdown and Zero-Downtime Deployment in Spring Boot
- How to Deploy a Spring Boot Application to Kubernetes
Mockito 5 articles
- Mastering Mockito in Spring Boot Service Layer Tests - when, verify, ArgumentCaptor, and doThrow in Practice
- Spring Boot Test Annotations Cheat Sheet - How to Choose Between @SpringBootTest, @WebMvcTest, and @DataJpaTest
- @MockBean Deprecated in Spring Boot 3.4 - Migrating to @MockitoBean and @MockitoSpyBean and How to Use Them
- How to Write Controller Unit Tests with MockMvc in Spring Boot - Introduction to @WebMvcTest
- Let's Write Tests in Spring Boot - An Introduction to Unit Testing with JUnit and Mockito
Spring Boot 3 5 articles
- How to Standardize Error Responses with Problem Details (RFC 9457) in Spring Boot 3.x
- Introducing Distributed Tracing with Micrometer Tracing and Zipkin in Spring Boot 3.2+
- Spring Boot 2.x to 3.x Migration Guide - Java 17 Required with Checklist
- How to Implement a Circuit Breaker with Resilience4j in Spring Boot - A Guide for Spring Boot 3.x
- Spring Boot Virtual Threads (Java 21): Setup, Performance, and Pitfalls
Async Processing 4 articles
- Implementing Kafka Producer and Consumer in Spring Boot - Beginner's Guide with Sample Code
- How to Implement RabbitMQ Producer and Consumer with Spring Boot - AMQP and spring-amqp Basics
- How to Send Emails with JavaMailSender in Spring Boot - From Gmail/SMTP Configuration to HTML Emails
- How to Implement Asynchronous Processing in Spring Boot - Using @Async and @EnableAsync
Bean Validation 4 articles
- How to Validate List<DTO>, @RequestParam, and @PathVariable in Spring Boot - Why @Valid Doesn't Work and How to Handle the 3 Exceptions
- How to Validate Spring Boot @ConfigurationProperties with Bean Validation - A Fail Fast Implementation Guide for Detecting Configuration Errors at Startup
- How to Create Custom Validation Annotations in Spring Boot - @Constraint/ConstraintValidator Implementation Guide
- Server-Side Rendering with Thymeleaf in Spring Boot: A Complete Guide to Forms, Validation, and Security Integration
Caching 4 articles
- How to Implement a Second-Level Cache with @CacheNamespace in Spring Boot + MyBatis - cache Tag and Redis Integration
- How to Configure and Tune Caffeine Cache in Spring Boot - From expireAfterWrite and maximumSize to Production Operations with stats()
- How to Use Redis with Spring Boot - Implementation Patterns for Session Management, Caching, and Pub/Sub
- How to Use Spring Boot Caching - Easy Performance Improvements with @Cacheable
Dynamic SQL 4 articles
- Spring Boot + MyBatis: How to Build Dynamic SQL with Java Code Only Using SqlProvider
- How to Reuse SQL in Spring Boot + MyBatis Using sql and include Tags - Eliminating Query Duplication Across Mappers
- 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 Use MyBatis with Spring Boot - Implementation Guide for Mapper Definitions, Dynamic SQL, and Result Mapping
Flyway 4 articles
- How to Introduce baselineOnMigrate for an Existing Database with Spring Boot + Flyway - Initializing baselineVersion and flyway_schema_history
- How to Fix "Validate failed" / "checksum mismatch" in Spring Boot + Flyway - flyway repair and Production Recovery Steps
- How to Connect Spring Boot to MySQL - application.yml Configuration, JDBC URL Parameters, and Time Zone/Character Encoding Pitfalls
- Database Migration Management with Flyway in Spring Boot - A Guide from Version Control to Production Deployment
Hibernate 4 articles
- How to Speed Up Bulk INSERTs with Spring Data JPA - hibernate.jdbc.batch_size and Batching saveAll
- How to Fix LazyInitializationException in Spring Boot + JPA - Causes and Solutions for "could not initialize proxy - no Session"
- How to Implement Multi-Tenancy in Spring Boot
- How to Implement Soft Delete with Spring Boot + JPA - Choosing Between @SQLDelete, @SQLRestriction, and Filters
Kafka 4 articles
- How to Write Integration Tests with PostgreSQL, Kafka, and Redis Using Spring Boot Testcontainers
- Implementing the Transactional Outbox Pattern in Spring Boot
- How to Implement Distributed Transactions in Microservices with the Saga Pattern in Spring Boot
- Implementing Kafka Producer and Consumer in Spring Boot - Beginner's Guide with Sample Code
Pagination 4 articles
- How to Implement Pagination with Spring Boot + MyBatis - Choosing Between PageHelper, RowBounds, and Hand-Written LIMIT/OFFSET
- How to Implement Type-Safe Dynamic Queries with QueryDSL in Spring Boot
- How to Implement Dynamic Queries with Spring Data JPA Specification - Supporting Search Form Filtering with JpaSpecificationExecutor
- How to Implement Pagination in Spring Boot REST API - Using Pageable and Page
Springboottest 4 articles
- How to Load Test Data in Spring Boot Tests Using the @Sql Annotation
- Spring Boot @SpringBootTest webEnvironment Guide - Choosing Between MOCK, RANDOM_PORT, DEFINED_PORT, and NONE
- How to Write Real HTTP E2E Tests in Spring Boot with @SpringBootTest(RANDOM_PORT) and TestRestTemplate
- Let's Write Tests in Spring Boot - An Introduction to Unit Testing with JUnit and Mockito
Tuning 4 articles
- How to Configure and Tune Caffeine Cache in Spring Boot - From expireAfterWrite and maximumSize to Production Operations with stats()
- Why HikariCP Fails to Connect When Scaling Spring Boot to Multiple Replicas on Kubernetes - Reverse-Engineering maximumPoolSize from the DB's max_connections
- How to Tune Embedded Tomcat Thread Count in Spring Boot - Deciding server.tomcat.threads.max, max-connections, and accept-count
- How to Properly Configure and Tune HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
@Async 3 articles
- Why @Transactional, @Cacheable, and @Async Don't Work in Spring Boot - Understanding AOP Proxies and Self-Invocation to Fix It
- How to Send Emails with JavaMailSender in Spring Boot - From Gmail/SMTP Configuration to HTML Emails
- How to Implement Asynchronous Processing in Spring Boot - Using @Async and @EnableAsync
Concurrency Control 3 articles
Database Migration 3 articles
- How to Introduce baselineOnMigrate for an Existing Database with Spring Boot + Flyway - Initializing baselineVersion and flyway_schema_history
- How to Fix "Validate failed" / "checksum mismatch" in Spring Boot + Flyway - flyway repair and Production Recovery Steps
- Database Migration Management with Flyway in Spring Boot - A Guide from Version Control to Production Deployment
Docker 3 articles
Event Driven 3 articles
Exception Handling 3 articles
- How to Validate List<DTO>, @RequestParam, and @PathVariable in Spring Boot - Why @Valid Doesn't Work and How to Handle the 3 Exceptions
- Implementing Spring Boot's GlobalExceptionHandler for Production Use
- How to Return Unified Error Responses in Spring Boot REST APIs - Using @ControllerAdvice and @ExceptionHandler (with @RestControllerAdvice / ResponseEntityExceptionHandler)
Jdbc 3 articles
- How to Detect and Debug HikariCP Connection Leaks in Spring Boot - leakDetectionThreshold and Thread Dump Analysis
- How to Retrieve the Auto-Generated ID (AUTO_INCREMENT) After INSERT with Spring Boot + MyBatis
- How to Connect Spring Boot to MySQL - application.yml Configuration, JDBC URL Parameters, and Time Zone/Character Encoding Pitfalls
Micrometer 3 articles
OAuth2 3 articles
- Which Spring Boot Authentication Method Should You Choose? Comparing Session, JWT, OAuth2, and API Key with a Selection Flowchart
- How to Configure Spring Boot as an OAuth2 Resource Server - Implementing JWT Validation and Scope-Based Authorization
- How to Implement Google Login (OAuth2) with Spring Boot
Openapi 3 articles
Postgresql 3 articles
- Causes and Fixes for HikariCP "Failed to validate connection" and "Connection is closed" in Spring Boot - How to Decide maxLifetime and keepaliveTime
- How to Speed Up Bulk INSERTs with Spring Data JPA - hibernate.jdbc.batch_size and Batching saveAll
- How to Write Integration Tests with PostgreSQL, Kafka, and Redis Using Spring Boot Testcontainers
Problemdetail 3 articles
RestTemplate 3 articles
Retry 3 articles
Sql 3 articles
- How to Reuse SQL in Spring Boot + MyBatis Using sql and include Tags - Eliminating Query Duplication Across Mappers
- 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 Execute Raw SQL with Spring Boot's JdbcTemplate - Using queryForObject, RowMapper, and Batch Updates
Testcontainers 3 articles
- How to Unit Test Mappers in Spring Boot + MyBatis - Why @MybatisTest Doesn't Exist and Alternative Configurations with H2/Testcontainers
- How to Write Repository Layer Slice Tests with @DataJpaTest in Spring Boot - Choosing Between H2 and Testcontainers
- How to Write Integration Tests with PostgreSQL, Kafka, and Redis Using Spring Boot Testcontainers
Thymeleaf 3 articles
- How to Dynamically Generate PDFs in Spring Boot - Report Output with OpenPDF and Thymeleaf
- Understanding Spring Security CSRF Protection Correctly - Configuration Differences Between REST APIs and Web Apps
- Server-Side Rendering with Thymeleaf in Spring Boot: A Complete Guide to Forms, Validation, and Security Integration
Transaction 3 articles
- How to Fix LazyInitializationException in Spring Boot + JPA - Causes and Solutions for "could not initialize proxy - no Session"
- How to Safely Process Large Data with Spring Batch - Introductory Guide to Job/Step/Chunk Processing
- Understanding Transaction Management with @Transactional in Spring Boot - Choosing Propagation and Isolation Levels
Unit Test 3 articles
- How to Test @RestControllerAdvice Exception Handlers Using MockMvc in Spring Boot - Verifying Status Codes and ProblemDetail
- Mastering Mockito in Spring Boot Service Layer Tests - when, verify, ArgumentCaptor, and doThrow in Practice
- Let's Write Tests in Spring Boot - An Introduction to Unit Testing with JUnit and Mockito
WebClient 3 articles
Webmvctest 3 articles
- How to Test Authentication-Required APIs with Spring Security and MockMvc - Choosing Between @WithMockUser and SecurityMockMvcRequestPostProcessors
- How to Write Controller Unit Tests with MockMvc in Spring Boot - Introduction to @WebMvcTest
- Let's Write Tests in Spring Boot - An Introduction to Unit Testing with JUnit and Mockito
API Documentation 2 articles
@Cacheable 2 articles
Batch Processing 2 articles
Caffeine 2 articles
Comparison 2 articles
Configuration 2 articles
Configuration Management 2 articles
Configuration Properties 2 articles
Controller 2 articles
Csv 2 articles
Datajpatest 2 articles
Datasource 2 articles
Design 2 articles
Devops 2 articles
Distributed Transaction 2 articles
Dto 2 articles
Dynamic Query 2 articles
Fault Tolerance 2 articles
File I/O 2 articles
File Upload 2 articles
Filter 2 articles
Flyway Schema History 2 articles
Http Client 2 articles
Implementation Guide 2 articles
Integration Test 2 articles
Jackson 2 articles
Json 2 articles
Junit 5 2 articles
Logback 2 articles
Lombok 2 articles
Mapper Xml 2 articles
- How to Reuse SQL in Spring Boot + MyBatis Using sql and include Tags - Eliminating Query Duplication Across Mappers
- 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"