| Name | Description | Type | Package | Framework |
| ConfigurationErrorEvent | An event class that is used for reporting errors that occurred while processing configuration properties. | Class | org.apache.commons.configuration.event | Apache Commons |
| ConfigurationErrorListener | An event listener interface to be implemented by observers that are interested in internal errors caused by processing of configuration | Interface | org.apache.commons.configuration.event | Apache Commons |
| ConfigurationEvent | An event class for reporting updates on a configuration object. | Class | org.apache.commons.configuration.event | Apache Commons |
| ConfigurationListener | A simple event listener interface for configuration observers. | Interface | org.apache.commons.configuration.event | Apache Commons |
| EventSource | A base class for objects that can generate configuration events. | Class | org.apache.commons.configuration.event | Apache Commons |