Today while installing SQLDeveloper on OEL 6.3 I ran into a couple of issues I wasn’t expecting. The installation went fine using the Oracle rpm file. The first execution of the /opt/sqldeveloper/sqldeveloper.sh script prompted for the location of a jdk. A find came up with /etc/alternatives/java_sdk_openjdk and that worked fine. The next issue was “Can’t connect to X11 window server using ‘:0.0’ as the value of the DISPLAY variable”. I tried running xterm to see if it would work. Xterm was not installed on the system and I couldn’t find any of the other X11 stuff. So I ran “yum install xterm”. Now xterm works and so does SQLDeveloper.