Run this script and do repeated ps commands to see the java that is spawned to run the test:

#!/bin/sh
/java/re/jtreg/4.0/promoted/latest/binaries/jtreg/solaris/bin/jtreg \
   -javaoption:-Djopt=1 -javaoption:-Djopt2=1 \
   -r:xx/JTreport -w:XX/JTwork \
    /java/re/jdk/1.7.0/latest/ws/jdk/test/com/sun/jdi/VarargsTest.java &

# end

Here is the java command that is spawned. Note the value of -Dtest.java.opts.

/net/jre.sfbay/p/v13/jdk/7/ea/b28/binaries/solaris-sparc/bin/java -Djopt=1 -Djopt2=1 -Dtest.src=/net/jre.sfbay/p/v13/jdk/7/ea/b28/ws/jdk/test/com/sun/jdi -Dtest.classes=/net/mmm.sfbay/export/home/jjh/ws/77/tl/jdk/test/com/sun/jdi/XX/JTwork/classes/com/sun/jdi -Dtest.vm.opts=[] -Dtest.tool.vm.opts=[] -Dtest.javac.opts=[] -Dtest.java.opts=[-Djopt=1, -Djopt2=1] com.sun.javatest.regtest.MainWrapper /net/mmm.sfbay/export/home/jjh/ws/77/tl/jdk/test/com/sun/jdi/XX/JTwork/classes/com/sun/jdi/VarargsTest.jta