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/logging.properties 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)