Sun Java System Application Server 9.1 Update 1-9.1 Update 2 Release Notes

Solution

Installing Application Server using a path name that contains special characters or the DOS-style short name truncation (such as progra~2) is strongly discouraged because it impedes subsequent upgrade installations. If such an installation exists, either reinstall it using long path names before upgrading, or install the new version of Application Server in an entirely new directory.