| Drainable | Indicates connection pools and similar data structures have a means of waiting for resources to close/clean up. |
| ForcedDrainable | Indicates connection pools and similar data structures which have a means of waiting for resources to close/clean up and additionally support a more aggressive form of draining which attempts to forcibly release the underlying resources. |
| Weighted | An interface for objects that have a weight associated with them used for sorting. |
| ModuleDescriptorUtils | Utility methods for working with plugin ModuleDescriptor ModuleDescriptors. |