# Package io.vertx.core.logging

- Class Summary
  Class | Description
  --- | ---
  JULLogDelegate | A `LogDelegate` which delegates to java.util.logging
  JULLogDelegateFactory | A `LogDelegateFactory` which creates `JULLogDelegate` instances.
  Log4j2LogDelegate | A `LogDelegate` which delegates to Apache Log4j 2
  Log4j2LogDelegateFactory | A `LogDelegateFactory` which creates `Log4j2LogDelegate` instances.
  Log4jLogDelegate | A `LogDelegate` which delegates to Apache Log4j
  Log4jLogDelegateFactory | A `LogDelegateFactory` which creates `Log4jLogDelegate` instances.
  Logger | This class allows us to isolate all our logging dependencies in one place.
  LoggerFactory |
  SLF4JLogDelegate |
  SLF4JLogDelegateFactory |
  VertxLoggerFormatter |

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