# All Packages

Package Summary
Package
Description
org.springframework.aot
Core package for Spring AOT infrastructure.
org.springframework.aot.generate
Support classes for components that contribute generated code equivalent to a runtime behavior.
org.springframework.aot.hint
Support for registering the need for reflection, resources, java serialization and proxies at runtime.
org.springframework.aot.hint.annotation
Annotation support for runtime hints.
org.springframework.aot.hint.predicate
Predicate support for runtime hints.
org.springframework.aot.hint.support
Convenience classes for using runtime hints.
org.springframework.aot.nativex
Support for generating GraalVM native configuration from runtime hints.
org.springframework.asm
Spring's repackaging of ASM 9.x (with Spring-specific patches; for internal use only).
org.springframework.cglib
Spring's repackaging of CGLIB 3.3 (with Spring-specific patches; for internal use only).
org.springframework.cglib.beans
Spring's repackaging of the CGLIB beans package (for internal use only).
org.springframework.cglib.core
Spring's repackaging of the CGLIB core package (for internal use only).
org.springframework.cglib.core.internal
Spring's repackaging of the CGLIB core internal package (for internal use only).
org.springframework.cglib.proxy
Spring's repackaging of the CGLIB proxy package (for internal use only).
org.springframework.cglib.reflect
Spring's repackaging of the CGLIB reflect package (for internal use only).
org.springframework.cglib.transform
Spring's repackaging of the CGLIB transform package (for internal use only).
org.springframework.cglib.transform.impl
Spring's repackaging of the CGLIB transform impl package (for internal use only).
org.springframework.cglib.util
Spring's repackaging of the CGLIB util package (for internal use only).
org.springframework.core
Provides basic classes for exception handling and version detection, and other core helpers that are not specific to any part of the framework.
org.springframework.core.annotation
Core support package for annotations, meta-annotations, and merged annotations with attribute overrides.
org.springframework.core.codec
`Encoder` and `Decoder` abstractions to convert between a reactive stream of bytes and Java objects.
org.springframework.core.convert
Type conversion system API.
org.springframework.core.convert.converter
SPI to implement Converters for the type conversion system.
org.springframework.core.convert.support
Default implementation of the type conversion system.
org.springframework.core.env
Spring's environment abstraction consisting of bean definition profile and hierarchical property source support.
org.springframework.core.io
Generic abstraction for (file-based) resources, used throughout the framework.
org.springframework.core.io.buffer
Generic abstraction for working with byte buffer implementations.
org.springframework.core.io.support
Support classes for Spring's resource abstraction.
org.springframework.core.log
Useful delegates for Spring's logging conventions.
org.springframework.core.metrics
Support package for recording metrics during application startup.
org.springframework.core.metrics.jfr
Support package for recording startup metrics using Java Flight Recorder.
org.springframework.core.serializer
Root package for Spring's serializer interfaces and implementations.
org.springframework.core.serializer.support
Support classes for Spring's serializer abstraction.
org.springframework.core.style
Support for styling values as Strings, with ToStringCreator as central class.
org.springframework.core.task
This package defines Spring's core TaskExecutor abstraction, and provides SyncTaskExecutor and SimpleAsyncTaskExecutor implementations.
org.springframework.core.task.support
Support classes for Spring's TaskExecutor abstraction.
org.springframework.core.type
Core support package for type introspection.
org.springframework.core.type.classreading
Support classes for reading annotation and class-level metadata.
org.springframework.core.type.filter
Core support package for type filtering (for example, for classpath scanning).
org.springframework.lang
Common annotations with language-level semantics: nullability as well as JDK API indications.
org.springframework.objenesis
Spring's repackaging of Objenesis 3.5 (with SpringObjenesis entry point; for internal use only).
org.springframework.util
Miscellaneous utility classes, such as utilities for working with strings, classes, collections, reflection, etc.
org.springframework.util.backoff
A generic back-off abstraction.
org.springframework.util.comparator
Useful generic `java.util.Comparator` implementations, such as an invertible comparator and a compound comparator.
org.springframework.util.concurrent
Useful generic `java.util.concurrent.Future` extensions.
org.springframework.util.function
Useful generic `java.util.function` helper classes.
org.springframework.util.unit
Useful unit data types.
org.springframework.util.xml
Miscellaneous utility classes for XML parsing and transformation, such as error handlers that log warnings via Commons Logging.