This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I just did a quick check and on my development machines, the open file limit is 1024. And that's with Maven builds going on all day long. Only my database servers actually override that limit.
You might want to check to see what your Maven build is doing that would run out of files when you have a limit of 3072 - about 3 times what I have. Maybe a plugin is being sloppy about closing files when it's done using them.
Customer surveys are for companies who didn't pay proper attention to begin with.