In a system with no jre installed but only a jdk with java-config-1.2.11-r1 the output of java-config -O(capital o) is the location of the JDK, but java-config -o outputs blank line. If no jre is installed java-config -o should be the same as -O
This will be fixed with 1.3.5, which will be available once the distfile makes the rounds to the mirrors.