1 Usage: jcmd <pid | main class> <command ...|PerfCounter.print|-f file> 2 or: jcmd -l 3 or: jcmd -h 4 5 command must be a valid jcmd command for the selected jvm. 6 Use the command "help" to see which commands are available. 7 If the pid is 0, commands will be sent to all Java processes. 8 The main class argument will be used to match (either partially 9 or fully) the class used to start Java. 10 If no options are given, lists Java processes (same as -l). 11 12 PerfCounter.print display the counters exposed by this process 13 -f read and execute commands from the file 14 -l list JVM processes on the local machine 15 -? -h --help print this help message