Vert.x - Logger


logging in Vertx is managed by the Vertx Logger

The Vertx logger is a facade for logging system. It uses the JUL logger as default logging engine. You may change it



By default, Vertx uses the JUL logger. If you want to use another logger, you need to perform this steps:

  • the system property called vertx.logger-delegate-factory-class-name must be set to the class name of the delegate for your logging system.
  • the logging system jar must be added as a dependency (ie must be in the classpath)

Example of how to set the system property by logging system:

java -Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.SLF4JLogDelegateFactory -Dlog4j.configuration=log4j.xml
System.setProperty("vertx.logger-delegate-factory-class-name", "io.vertx.core.logging.SLF4JLogDelegateFactory");
// version 1
java -Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.Log4jLogDelegateFactory -Dlog4j.configuration=log4j.xml
// version 2
java -Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.Log4j2LogDelegateFactory -Dlog4j.configuration=log4j.xml
java -Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.SLF4JLogDelegateFactory -Dlogback.configurationFile=logback.xml

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