Low-level install logs are located as follows, where timestamp is of the format mmddHHMM.
Solaris (root installation)
/var/sadm/install/logs/Sun_Java_System_Web_Server_install.timestamp
Solaris (non-root installation)
/var/tmp/Sun_Java_System_Web_Server_install.timestamp
Linux, HP-UX, AIX
/var/tmp/Sun_Java_System_Web_Server_install.timestamp
Windows
%tmp%\Sun_Java_System_Web_Server_install.timestamp