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Spring Boot 136 articles
- 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
Java 20 articles
- 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 - An Implementation Guide to 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
- Implementing a Synchronous HTTP Client with RestClient in Spring Boot 3.2 - Migrating from RestTemplate/WebClient
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 Date Formatting, Null Exclusion, and snake_case
- Implementing Spring Boot's GlobalExceptionHandler for Production Use
JPA 18 articles
- 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
- How to Implement Pessimistic Locking (@Lock) with Spring Boot + JPA - PESSIMISTIC_WRITE and Deadlock Prevention
- How to Load Initial Data with data.sql and schema.sql in Spring Boot - When to Use Flyway/Liquibase Instead
Spring Security 15 articles
- 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
- How to Configure Spring Boot as an OAuth2 Resource Server - Implementing JWT Validation and Scope-Based Authorization
Spring Data JPA 11 articles
- 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
- How to Work with Multiple DataSources in Spring Boot - Read/Write Separation and AbstractRoutingDataSource
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
Dependency Injection 8 articles
- 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
- 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?
Testing 8 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 Repository Layer Slice Tests with @DataJpaTest in Spring Boot - Choosing Between H2 and Testcontainers
- How to Write Controller Unit Tests with MockMvc in Spring Boot - Introduction to @WebMvcTest
- How to Validate Spring Boot @ConfigurationProperties with Bean Validation - A Fail Fast Implementation Guide for Detecting Configuration Errors at Startup
Actuator 7 articles
- 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 Correctly Configure and Tune the HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
- How to Deploy a Spring Boot Application to Kubernetes
- Visualizing Spring Boot Metrics with Prometheus and Grafana
Data Access 7 articles
- How to Implement Pagination with Spring Boot + MyBatis - Choosing Between PageHelper, RowBounds, and Hand-Written LIMIT/OFFSET
- How to Use MyBatis with Spring Boot - An Implementation Guide to 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 Retrieve DTOs Directly with Spring Data JPA Projections - Choosing Between Interface-Based and Class-Based Projections
- How to Execute Raw SQL with Spring Boot's JdbcTemplate - Using queryForObject, RowMapper, and Batch Updates
- How to Implement Soft Delete with Spring Boot + JPA - Choosing Between @SQLDelete, @SQLRestriction, and Filters
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 Are @Configuration and @Bean in Spring Boot? Differences 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
Performance 6 articles
- 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 Correctly Configure and Tune the HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
- Spring Boot Virtual Threads (Java 21): Setup, Performance, and Pitfalls
- How to Implement Asynchronous Processing in Spring Boot - Using @Async and @EnableAsync
Redis 6 articles
- 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
- How to Use Spring Boot Caching - Easy Performance Improvements with @Cacheable
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
Architecture 5 articles
- 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
- MyBatis vs JPA in Spring Boot - Selection Criteria and Combined Usage Patterns [With Comparison Table]
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
- Spring Boot JWT Authentication with Spring Security (Tutorial)
- Getting Started with Authentication in Spring Boot Using Spring Security - From Basic Auth to Form Login
Database 5 articles
- 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 Correctly Configure and Tune the HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
- Managing Database Migrations with Flyway in Spring Boot - A Practical Guide from Version Control to Production Deployment
- Introduction to JPA Association Mapping in Spring Boot - How to Use @OneToMany/@ManyToOne/@ManyToMany and mappedBy
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? How It Works and How to Use It, with Sample Code
- What Is DI (Dependency Injection) in Spring Boot? How It Works, How to Write It, and Its Benefits [Beginner's Guide]
- 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
- Spring Boot JWT Authentication with Spring Security (Tutorial)
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
- Writing 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
Application Yml 4 articles
- 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 Correctly Configure and Tune the 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
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 4 articles
- 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 Are @Configuration and @Bean in Spring Boot? Differences from @Component and How to Use Them
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
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
Kubernetes 4 articles
- 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
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
@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
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)
Hikaricp 3 articles
- 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 Correctly Configure and Tune the HikariCP Connection Pool in Spring Boot - Why the Default of 10 Isn't Enough
Junit 3 articles
MyBatis 3 articles
- How to Implement Pagination with Spring Boot + MyBatis - Choosing Between PageHelper, RowBounds, and Hand-Written LIMIT/OFFSET
- How to Use MyBatis with Spring Boot - An Implementation Guide to Mapper Definitions, Dynamic SQL, and Result Mapping
- MyBatis vs JPA in Spring Boot - Selection Criteria and Combined Usage Patterns [With Comparison Table]
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
RestTemplate 3 articles
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 the Right Propagation and Isolation Levels
Troubleshooting 3 articles
- Why @Transactional, @Cacheable, and @Async Don't Work in Spring Boot - Understanding AOP Proxies and Self-Invocation to Fix It
- How to Fix LazyInitializationException in Spring Boot + JPA - Causes and Solutions for "could not initialize proxy - no Session"
- Spring Boot Application Won't Start? How to Isolate the Cause and Fix It