How to change maven logging level to display only warning and errors?

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I made a small investigation because I am also interested in the solution.

Maven command line verbosity options

According to http://books.sonatype.com/mvnref-book/reference/running-sect-options.html#running-sect-verbose-option

  • -e for error
  • -X for debug
  • -q for only error

Maven logging config file

Currently maven 3.1.x uses SLF4J to log to the System.out .
You can modify the logging settings at the file:

${MAVEN_HOME}/conf/logging/simplelogger.properties

According to the page : http://maven.apache.org/maven-logging.html

Command line setup

I think you should be able to setup the default Log level of the simple logger via a command line parameter, like this:

$ mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=debug

But I could not get it to work. I guess the only problem with this is, maven picks up the default level from the config file on the classpath. I also tried a couple of other settings via System.properties, but all of them were unsuccessful.

Appendix

You can find the source of slf4j on github here : slf4j github

The source of the simplelogger here : slf4j/jcl-over-slf4j/src/main/java/org/apache/commons/logging/impl/SimpleLog.java

The plexus loader loads the simplelogger.properties.

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