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Found something promising after googling "netbeans generate javadoc for private members" that seems to confirm my guess: NetBeans Forums - Generating JavaDocs

I am not familiar enough with netbeans to give you a step by step guide, but I would imagine this is a pretty google-able problem. You might test my theory by making one of the variables public and...

What exactly do you mean? It might be because you aren't generating javadoc for private members.