| Package | Description | 
|---|---|
| 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 composed
 annotations with attribute overrides. | 
| org.springframework.core.codec | |
| 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.serializer | Root package for Spring's serializer interfaces and implementations. | 
| 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 (e.g. | 
| org.springframework.util | Miscellaneous utility classes, such as String manipulation utilities,
 a Log4J configurer, and a state holder for paged lists of objects. | 
| org.springframework.util.comparator | Useful generic  java.util.Comparatorimplementations,
 such as an invertible comparator and a compound comparator. | 
| org.springframework.util.concurrent | Useful generic  java.util.concurrent.Futureextensions. | 
| org.springframework.util.function | Useful generic  java.util.functionhelper 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. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. | 
| Class and Description | 
|---|
| Nullable A common Spring annotation to declare that annotated elements can be  nullunder
 some circumstance. |