In the JDK 7 man pages for jcmd, the description of the "command [arguments]" part of the command line is missing and in its place is a repetition of the description of "main-class" instead.

http://docs.oracle.com/javase/7/docs/technotes/tools/solaris/jcmd.html
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jcmd.html

The JDK 8 pages seem to have the correct description:

http://docs.oracle.com/javase/8/docs/technotes/tools/unix/jcmd.html

"The command to be sent to the specified Java process. The list of available diagnostic commands for a given process can be obtained by sending the help command to this process. Each diagnostic command has its own set of arguments. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the help command."