jstat: obtain statistics information about a Java process
 Usage:
    jstat [<option>] [<vmid>]

  option:
   -J : supply arguments to the Java VM running jstat
   -h : print this help message
   -options : list the available command options
   -class : Classloading statistics
  <vmid>: Attach API VM ID as shown in jps or other Attach API-based tools
NOTE: this utility might significantly affect the performance of the target VM.
At least one option must be selected.