Data models

Cross-cutting types you'll encounter often when reading the framework. This is not exhaustive — the framework defines tens of thousands of types — but it's a quick lookup for the most commonly referenced ones.

Core type system

Type	Module	Purpose
org.springframework.core.ResolvableType	spring-core	Full generic type info; usable for autowiring matching
org.springframework.core.MethodParameter	spring-core	Reflective metadata about a method param/return
org.springframework.core.io.Resource	spring-core	Abstraction over a readable source
org.springframework.core.io.ResourceLoader	spring-core	Looks up Resources from string locations
org.springframework.core.env.Environment	spring-core	Properties + profiles
org.springframework.core.convert.ConversionService	spring-core	Type conversion SPI
org.springframework.core.ReactiveAdapterRegistry	spring-core	Adapt between Reactor / RxJava / Mutiny / coroutines

Container

Type	Module	Purpose
org.springframework.beans.factory.BeanFactory	spring-beans	Container lookup interface
org.springframework.beans.factory.config.BeanDefinition	spring-beans	Bean creation metadata
org.springframework.beans.factory.support.DefaultListableBeanFactory	spring-beans	Default container implementation
org.springframework.context.ApplicationContext	spring-context	Container plus events, message source, lifecycle
org.springframework.context.ConfigurableApplicationContext	spring-context	Adds refresh, close, configuration
org.springframework.context.ApplicationEvent	spring-context	Base for application events

HTTP

Type	Module	Purpose
org.springframework.http.HttpStatusCode / HttpStatus	spring-web	Status code value type and well-known constants
org.springframework.http.HttpHeaders	spring-web	Multi-valued header bag
org.springframework.http.MediaType	spring-web	Content type with parameters and quality factor
org.springframework.http.HttpMethod	spring-web	HTTP method value type
org.springframework.http.RequestEntity / ResponseEntity	spring-web	Headers + status + body wrappers
org.springframework.http.converter.HttpMessageConverter	spring-web	Servlet-stack body codec SPI
org.springframework.http.codec.HttpMessageReader / HttpMessageWriter	spring-web	Reactive-stack body codec SPI
org.springframework.web.server.ServerWebExchange	spring-web	Reactive request/response/session context
org.springframework.web.method.HandlerMethod	spring-web	Reflective controller method

Data access

Type	Module	Purpose
org.springframework.dao.DataAccessException	spring-tx	Root data-access exception
org.springframework.transaction.PlatformTransactionManager	spring-tx	Imperative tx abstraction
org.springframework.transaction.ReactiveTransactionManager	spring-tx	Reactive tx abstraction
org.springframework.transaction.TransactionDefinition	spring-tx	Propagation, isolation, timeout
org.springframework.transaction.TransactionStatus	spring-tx	Live transaction state
org.springframework.jdbc.core.JdbcTemplate	spring-jdbc	SQL template
org.springframework.jdbc.core.RowMapper	spring-jdbc	ResultSet row → object
org.springframework.r2dbc.core.DatabaseClient	spring-r2dbc	Reactive SQL client

Messaging

Type	Module	Purpose
org.springframework.messaging.Message	spring-messaging	Generic message: payload + headers
org.springframework.messaging.MessageChannel	spring-messaging	Channel for messages
org.springframework.messaging.MessageHandler	spring-messaging	Message receiver

Test

Type	Module	Purpose
org.springframework.test.context.junit.jupiter.SpringExtension	spring-test	JUnit 5 extension for the TestContext framework
org.springframework.test.web.servlet.MockMvc	spring-test	In-memory MVC dispatcher
org.springframework.test.web.reactive.server.WebTestClient	spring-test	Reactive test client

AOT / hints

Type	Module	Purpose
org.springframework.aot.hint.RuntimeHints	spring-core	Container for hints
org.springframework.aot.hint.RuntimeHintsRegistrar	spring-core	SPI to register hints
org.springframework.aot.hint.ReflectionHints	spring-core	Reflection-specific hints
org.springframework.aot.hint.ResourceHints	spring-core	Resource-specific hints
org.springframework.aot.hint.SerializationHints	spring-core	Serialization hints
org.springframework.aot.hint.ProxyHints	spring-core	Proxy class hints

See also

• overview/glossary — vocabulary
• Per-module pages in modules/