# Package org.apache.log4j.spi

- Interface Summary
  Interface | Description
  --- | ---
  Configurator | Implemented by classes capable of configuring log4j using a URL.
  HierarchyEventListener | Listen to events occurring within a `Hierarchy`.
  LoggerFactory | Implement this interface to create new instances of Logger or a sub-class of Logger.
  LoggerRepository | A `LoggerRepository` is used to create and retrieve `Loggers`.
  OptionHandler |

- Class Summary
  Class | Description
  --- | ---
  ErrorHandler | Created by IntelliJ IDEA.
  Filter |
  LoggingEvent |

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