docs: public static int pid(@Nonnull Process proc) {
              try {
                  if (JAVA8_PID_FIELD != null) {
                      return JAVA8_PID_FIELD.getInt(proc);
                  } else {
                      long pid = (long)JAVA9_PID_METHOD.invoke(proc);
                      if (pid > Integer.MAX_VALUE) {
                          throw new IllegalAccessError("Java 9+ support error (JENKINS-53799). PID is out of Jenkins API bounds: " + pid);
                      }
                      return (int)pid;
                  }
              } catch (IllegalAccessException | InvocationTargetException e) { // impossible
                  IllegalAccessError x = new IllegalAccessError();
                  x.initCause(e);
                  throw x;
              }
          }