jcmd is a supported tool on 7u4 and later. However, the following document
describes jcmd is an unsupported and Experimental tool. See (*1).

Document Location
=================
"Experimental:" for jcmd should be removed and the description about jcmd
should move to "Java Troubleshooting, Profiling, Monitoring and Management
Tools" section.

http://docs.oracle.com/javase/7/docs/technotes/tools/index.html
---
Monitoring Tools

You can use the following tools to monitor JVM performance statistics. The
tools described in this section are unsupported and experimental, and should
be used with that in mind. They may not be available in future JDK versions.

    :
    :

Tool Name Brief Description
jcmd _Experimental:_ JVM Diagnostic Commands tool ... <---- (*1)
    :
    :
---

Also, jcmd does not appear in the "Standard JDK Tools and Utilities" category
in header part of the page. jcmd should appear in the category.

---
Standard JDK Tools and Utilities

  - Basic Tools (appletviewer, apt, extcheck, jar, java, javac, javadoc,
javah, javap, jdb)
  - Security Tools (keytool, jarsigner, policytool, kinit, klist, ktab)
  - Internationalization Tools (native2ascii)
  - Remote Method Invocation (RMI) Tools (rmic, rmiregistry, rmid, serialver)
  - Java IDL and RMI-IIOP Tools (tnameserv, idlj, orbd, servertool)
  - Java Deployment Tools (javafxpackager, pack200, unpack200)
  - Java Web Start Tools (javaws)
  - Java Troubleshooting, Profiling, Monitoring and Management Tools
(JConsole) <---- jcmd should appear here
  - Java Web Services Tools (schemagen, wsgen, wsimport, xjc)
---

URL
===
http://docs.oracle.com/javase/7/docs/technotes/tools/index.html