Using jtreg 3.2.2_02,
Why would -jdk: fail, while -testjdk: succeeds?
Perhaps the drive letter on windows is confusing jtreg?

g:/martin/jct-tools/3.2.2_02/win32/bin/jtreg -automatic -jdk:g:/martin/ws/Leak7/build/windows-i586/j2sdk-image .
Unrecognized option: -jdk:g:/martin/ws/Leak7/build/windows-i586/j2sdk-image
Could not create the Java virtual machine.

g:/martin/jct-tools/3.2.2_02/win32/bin/jtreg -automatic -testjdk:g:/martin/ws/Leak7/build/windows-i586/j2sdk-image .
Test results: passed: 50
Report written to JTreport\report.html

$ pwd
/g/martin/ws/Leak7/test/java/util/concurrent
$ uname -a
CYGWIN_NT-5.0 morphy 1.5.12(0.116/4/2) 2004-11-10 08:34 i686 unknown unknown Cygwin