This bug is not a regression.
The fix was incorrectly included in a fix for JDK-8163164
so /INSTALLDIRJAVADB parameter processing still needs to be fixed.


/INSTALLDIRJAVADB parameter applies for JDK silent installation only.
If not specified JavaDB installs by default in c:\Program Files\Sun\JavaDB

If specified with spaces in a path
(for example: /INSTALLDIRJAVADB="c:\my javadb")
then JavaDB doesn't get installed and silent installer
displays a window with msiexec.exe syntax.

JRE and JDK are not affected. Both get installed correctly.