This issue is identified at the pcmdi beta-2 site. Once a user makes a search from the home page, selects 1+ datasets, clicks the "Download Files" button, selects "Get Data" the resulting page may be blank and throw an exception.

This issue is due to the DownloadDatasetController calling a RedirectView to the subsequent file listing page with a large query string that may exceed 8K, overflowing the tomcat output buffer.