// return true if OpenJ9 is available
sbool openJ9_dumpHeap(File file) {
  virtual OpenJ9DiagnosticsMXBean bean = openJ9_diagnosticsBean();
  if (bean == null) false;
  
  file.delete();
  mkdirsForFile(file);
  temp tempInfoBoxForever("Dumping heap (OpenJ9)...");
  
  long time = sysNow();
  call(bean, 'triggerDumpToFile, "heap", f2s(file));
  done2_always(time, "Done. " + fileInfo(file));
  true;
}