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This isn't documented in the Javadoc. (There is not javadoc on this method.) It seems to return the running version of Groovy when called:
Helpful if you really need to know.
As soon as groovy 1.6.6 and 1.7-rc-1 released, you will be able to get groovy version via documented groovy.lang.GroovySystem#getVersion() - http://bamboo.ci.codehaus.org/download/GROOVY-GROOVY160J14/artifacts/build-353/documentation/api/groovy/lang/GroovySystem.html#getVersion()
... but since InvokerHelper is a Groovy internal class being subject to change, you should use it only if you know which version of Groovy is running ... ;-)