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Logging in Groovy is based on the JDK logging facilities.
Please read the JDK logging documentation if you are new to the topic.

In order to enable tracing of how Groovy calls MetaMethods, use
the following settings:

in file %JAVA_HOME%/jre/lib/ or equivalent

  • make sure your log handler is configured to show level 'FINER' at least,
  • set MetaClass logging to 'FINER' at least,
  • set the appropriate Level for the Classes and optionally method names
    that you want to trace. The name for the appropriate logger starts with
    'methodCalls' and optionally ends with the method name,

with tracing enabled for all method calls a Groovy command line
script appears as follows (German locale)


There is one problem with loggers and groovy: Script name and line number is wrong. Groovy is using some bytecode magic which is confusing loggers. It is big problem for debugging, also message filtering by classes does not work.

There is simple patch for LOG4J which solve it. With it, LOG4J correctly shows file names and line numbers when invoked from Groovy. For more details check

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