Trying to install WebLogic today and I hit the following:
By default the installer extracts files to /tmp with a directory name in the format of bea<numbers|timestamp?>.tmp and uses 918M of space on Linux.
Usually you can use the OS environment variable TMPDIR to specify another temporary directory but I guess since this is a java program its ignored.
Instead you have to pass a parameter to Java when you launch the installer.
$JAVA_HOME/bin/java -Djava.io.tmpdir=/var/tmp -jar wls1032_generic.jar