That's a little unfair: I don't think there is anything in the JavaRanch rules of use requiring people don't post their questions on more than one site.
Frankly, I don't understand what you think is unfair about informing readers that the question may already have been answered in another location (and providing them a handy link to find the other thread). In no way did I suggest that this person's posting is in violation of any rules, so I'm not sure what your point is.
OK, perhaps I was reading a little into the tone of the reply you link to. Given it seems to be posted by the same person who is asking the question on this site, and they are asking the same question again, it is perhaps not that helpful to link them back to their original question? Or don't you agree? Referring to this link as a crosspost made me think you were being critical, pointing out that chandrashekhar dontula had already posted this question on another site. If this is not the case, I apologise.
Let's keep it polite here, guys. While Paul is correct, the JavaRanch doesn't have explicit rules against posting the same question at one of the other Java forums, I think Steve was doing us a service in letting us know that chandrashekhar had posted elsewhere. I sure would be ticked if I spent my valuable time answering a question and found out later that it had been answered elsewhere and chandrashekhar probably had never checked back here. FWIW, chandrashekhar also crossposted within the JavaRanch, a practice which is frowned upon because we don't want to duplicate effort within our own forums.