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# Spring Boot Components
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Essential Spring Boot modules and starters that form the foundation of Spring Boot applications. These components provide auto-configuration, embedded servers, and opinionated defaults for rapid application development.
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## Capabilities
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### Core Spring Boot Libraries
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Fundamental Spring Boot infrastructure components.
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```gradle { .api }
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// Core Spring Boot framework
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'org.springframework.boot:spring-boot'                    // 3.5.3
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'org.springframework.boot:spring-boot-autoconfigure'      // 3.5.3
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'org.springframework.boot:spring-boot-configuration-processor' // 3.5.3
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// Build and packaging
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'org.springframework.boot:spring-boot-loader'             // 3.5.3
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'org.springframework.boot:spring-boot-loader-tools'       // 3.5.3
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'org.springframework.boot:spring-boot-buildpack-platform' // 3.5.3
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```
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### Web Starters
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Web application starters with embedded servers and web framework auto-configuration.
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```gradle { .api }
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// Traditional servlet-based web applications
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'org.springframework.boot:spring-boot-starter-web'        // 3.5.3
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// Reactive web applications  
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'org.springframework.boot:spring-boot-starter-webflux'    // 3.5.3
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// JAX-RS with Jersey
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'org.springframework.boot:spring-boot-starter-jersey'     // 3.5.3
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// WebSocket support
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'org.springframework.boot:spring-boot-starter-websocket'  // 3.5.3
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// Web services (SOAP)
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'org.springframework.boot:spring-boot-starter-web-services' // 3.5.3
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```
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### Data Access Starters
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Data persistence starters with database auto-configuration and transaction management.
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```gradle { .api }
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// JPA with Hibernate
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'org.springframework.boot:spring-boot-starter-data-jpa'   // 3.5.3
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// Reactive data access with R2DBC
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'org.springframework.boot:spring-boot-starter-data-r2dbc'  // 3.5.3
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// Plain JDBC support
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'org.springframework.boot:spring-boot-starter-jdbc'       // 3.5.3
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// MongoDB support
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'org.springframework.boot:spring-boot-starter-data-mongodb' // 3.5.3
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'org.springframework.boot:spring-boot-starter-data-mongodb-reactive' // 3.5.3
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// Other NoSQL databases
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'org.springframework.boot:spring-boot-starter-data-neo4j'      // 3.5.3
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'org.springframework.boot:spring-boot-starter-data-cassandra'  // 3.5.3
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'org.springframework.boot:spring-boot-starter-data-couchbase'  // 3.5.3
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'org.springframework.boot:spring-boot-starter-data-elasticsearch' // 3.5.3
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// LDAP support
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'org.springframework.boot:spring-boot-starter-data-ldap'   // 3.5.3
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// REST repositories
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'org.springframework.boot:spring-boot-starter-data-rest'   // 3.5.3
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// jOOQ integration
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'org.springframework.boot:spring-boot-starter-jooq'       // 3.5.3
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```
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### Security Starters
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Security and authentication starters with Spring Security integration.
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```gradle { .api }
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// Core security
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'org.springframework.boot:spring-boot-starter-security'   // 3.5.3
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// OAuth2 client
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'org.springframework.boot:spring-boot-starter-oauth2-client' // 3.5.3
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// OAuth2 resource server
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'org.springframework.boot:spring-boot-starter-oauth2-resource-server' // 3.5.3
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// OAuth2 authorization server
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'org.springframework.boot:spring-boot-starter-oauth2-authorization-server' // 3.5.3
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```
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### Template Engine Starters
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View layer starters with template engine auto-configuration.
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```gradle { .api }
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// Thymeleaf templating
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'org.springframework.boot:spring-boot-starter-thymeleaf'  // 3.5.3
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// FreeMarker templating
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'org.springframework.boot:spring-boot-starter-freemarker' // 3.5.3
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// Mustache templating
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'org.springframework.boot:spring-boot-starter-mustache'   // 3.5.3
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// Groovy templates
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'org.springframework.boot:spring-boot-starter-groovy-templates' // 3.5.3
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```
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### Messaging Starters
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Message broker and event processing starters.
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```gradle { .api }
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// RabbitMQ AMQP
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'org.springframework.boot:spring-boot-starter-amqp'       // 3.5.3
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// Apache ActiveMQ
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'org.springframework.boot:spring-boot-starter-activemq'   // 3.5.3
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// Apache ActiveMQ Artemis
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'org.springframework.boot:spring-boot-starter-artemis'    // 3.5.3
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// Apache Kafka
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// Note: Kafka starter not included in dependencies BOM - use Spring Kafka directly
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// Apache Pulsar
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'org.springframework.boot:spring-boot-starter-pulsar'          // 3.5.3
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'org.springframework.boot:spring-boot-starter-pulsar-reactive' // 3.5.3
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```
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### Integration and Batch Starters
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Enterprise integration and batch processing starters.
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```gradle { .api }
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// Spring Integration
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'org.springframework.boot:spring-boot-starter-integration' // 3.5.3
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// Spring Batch
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'org.springframework.boot:spring-boot-starter-batch'      // 3.5.3
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// Spring HATEOAS
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'org.springframework.boot:spring-boot-starter-hateoas'    // 3.5.3
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// GraphQL
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'org.springframework.boot:spring-boot-starter-graphql'    // 3.5.3
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```
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### Caching and Session Starters
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Caching and session management starters.
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```gradle { .api }
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// Caching support
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'org.springframework.boot:spring-boot-starter-cache'      // 3.5.3
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// Redis data store
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'org.springframework.boot:spring-boot-starter-data-redis' // 3.5.3
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'org.springframework.boot:spring-boot-starter-data-redis-reactive' // 3.5.3
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```
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### Validation and AOP Starters
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Cross-cutting concern starters for validation and aspect-oriented programming.
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```gradle { .api }
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// Bean validation
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'org.springframework.boot:spring-boot-starter-validation' // 3.5.3
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// Aspect-oriented programming
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'org.springframework.boot:spring-boot-starter-aop'        // 3.5.3
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```
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### Embedded Server Starters
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Alternative embedded server configurations.
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```gradle { .api }
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// Embedded Tomcat (default for web starter)
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'org.springframework.boot:spring-boot-starter-tomcat'     // 3.5.3
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// Embedded Jetty
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'org.springframework.boot:spring-boot-starter-jetty'      // 3.5.3
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// Embedded Undertow  
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'org.springframework.boot:spring-boot-starter-undertow'   // 3.5.3
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// Reactive Netty (default for webflux)
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'org.springframework.boot:spring-boot-starter-reactor-netty' // 3.5.3
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// RSocket support
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'org.springframework.boot:spring-boot-starter-rsocket'    // 3.5.3
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```
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### Development and Operations Starters
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Development tools and production monitoring starters.
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```gradle { .api }
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// Development tools (hot reload, etc.)
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'org.springframework.boot:spring-boot-devtools'           // 3.5.3
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// Production monitoring
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'org.springframework.boot:spring-boot-starter-actuator'   // 3.5.3
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// Mail support
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'org.springframework.boot:spring-boot-starter-mail'       // 3.5.3
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// Quartz scheduler
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'org.springframework.boot:spring-boot-starter-quartz'     // 3.5.3
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```
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### Testing Starters
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Comprehensive testing support with Spring Boot integration.
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```gradle { .api }
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// Complete testing starter (includes JUnit, Mockito, AssertJ, Spring Test)
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'org.springframework.boot:spring-boot-starter-test'       // 3.5.3
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// Testcontainers integration
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'org.springframework.boot:spring-boot-testcontainers'     // 3.5.3
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```
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### Logging Starters
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Logging framework configuration starters.
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```gradle { .api }
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// Default logging (Logback)
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'org.springframework.boot:spring-boot-starter-logging'    // 3.5.3
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// Log4j2 alternative
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'org.springframework.boot:spring-boot-starter-log4j2'     // 3.5.3
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// JSON output
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'org.springframework.boot:spring-boot-starter-json'       // 3.5.3
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```
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## Usage Examples
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### Basic Web Application
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-web'
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    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
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    implementation 'org.springframework.boot:spring-boot-starter-security'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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}
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```
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### Reactive Web Application
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-webflux'
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    implementation 'org.springframework.boot:spring-boot-starter-data-r2dbc'
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    implementation 'org.springframework.boot:spring-boot-starter-data-redis-reactive'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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}
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```
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### Microservice with Messaging
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-web'
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    implementation 'org.springframework.boot:spring-boot-starter-amqp'
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    implementation 'org.springframework.boot:spring-boot-starter-actuator'
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    implementation 'org.springframework.boot:spring-boot-starter-cache'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'org.springframework.boot:spring-boot-testcontainers'
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}
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```