| ConfigurableEnvironment | Configuration interface to be implemented by most if not all Environments. |
| ConfigurablePropertyResolver | Configuration interface to be implemented by most if not all PropertyResolvers. |
| Environment | Interface representing the environment in which the current application is running. |
| EnvironmentCapable | Interface indicating a component contains and makes available an Environment object. |
| PropertyResolver | Interface for resolving properties against any underlying source. |
| PropertySources | Holder containing one or more PropertySource objects. |
| AbstractEnvironment | Abstract base class for Environment implementations. |
| AbstractPropertyResolver | Abstract base class for resolving properties against any underlying source. |
| DefaultEnvironment | Default implementation of the Environment interface. |
| EnumerablePropertySource<T> | TODO SPR-7508: document |
| MapPropertySource | PropertySource that reads keys and values from a Map object. |
| MutablePropertySources | Default implementation of the PropertySources interface. |
| PropertiesPropertySource | PropertySource implementation that extracts properties from a java.util.Properties object. |
| PropertySource<T> | Abstract base class representing a source of key/value property pairs. |
| PropertySource.StubPropertySource | PropertySource to be used as a placeholder in cases where an actual
property source cannot be eagerly initialized at application context
creation time. |
| PropertySourcesPropertyResolver | PropertyResolver implementation that resolves property values against
an underlying set of PropertySources. |