There are 2 issues about man pages. They are reproducible in both jdk8 and jdk7u4.
1. jcmd.1 has been recently added and the source file can be found in jdk repo (English file is in master repo, Japanese file has not been integrated yet, still in team repo), but they are not included in the binaries.
jdk/src/solaris/doc/sun/man/man1/jcmd.1 available in master repo
jdk/src/solaris/doc/sun/man/man1/ja/jcmd.1 available in team repo
jdk/src/linux/doc/man/jcmd.1 available in master repo
jdk/src/linux/doc/man/ja/jcmd.1 available in team repo
2. jvisualvm.1 is available in the binaries for English, but Japanese file is not included in the binaries, though the source file is available in the master repo.
jdk/src/solaris/doc/sun/man/man1/jvisualvm.1 available in master repo
jdk/src/solaris/doc/sun/man/man1/ja/jvisualvm.1 available in master repo
jdk/src/linux/doc/man/jvisualvm.1 available in master repo
jdk/src/linux/doc/man/ja/jvisualvm.1 available in master repo