jtreg doesn't support multiple @key labels:
from http://openjdk.java.net/jtreg/tag-spec.html
@key <keyword>+
Label this test with the given keyword(s). Some harnesses allow tests to be selected via boolean expressions on keywords. The list of acceptable keywords may be specified in the TEST.ROOT file (see below). The @key tag may be used at most once in a given test.

unfortunately, jtreg doesn't report it as an error either and silently all but the very last value.