As a rule, people do not put private methods in Javadoc, because Javadoc is for someone who uses your code. Since they cannot access private methods, it makes no sense to document them for this audience.
However, a flag is provided for the javadoc tool:
javadoc -private
Will generate private methods in your Javadoc. I'm not sure how BlueJ works with this, but maybe you can pass a flag or something like that.
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