| Package | Description | 
|---|---|
| org.springframework.util.function | Useful generic  java.util.functionhelper classes. | 
| Class and Description | 
|---|
| SingletonSupplier A  Supplierdecorator that caches a singleton result and
 makes it available fromSingletonSupplier.get()(nullable) andSingletonSupplier.obtain()(null-safe). |