How do I known what properties and method exist when writing Groovy scripts?

[Martin d'Anjou]

Hi,

How do I find out the methods and properties of things when I write a 
Groovy script? For example, "Hudson.instance.getItem()", how am I 
supposed to know that "instance" is a property of Hudson, and that 
"getItem()" is a method of "instance"?

Where do you people find all this?

Another example: I searched for buildVariableResolver in the source code 
with find . -name "*.java" -exec grep -H buildVariableResolver {} \; and 
nothing comes out.

I read the javadocs for Jenkins and Hudson, but that does not seem to be 
enough.

Thanks,
Martin