I don't understand your question.
The run dependencies for productivity/thinkingrock include jdk.
Code:
$ pwd
/usr/ports/productivity/thinkingrock
$ make print-run-depends
This port requires package(s) "javaPathHelper-0.3p1 xdg-utils-1.1.0rc1p0
libiconv-1.14 jdk-1.6.0.03p17" to run.
$