docs: public void clearBody() {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "clearBody");
      getPayload().setChoiceField(JmsStreamBodyAccess.BODY, JmsStreamBodyAccess.IS_BODY_EMPTY);
      bodyList = new JsMsgList(null);
      reset();
      clearCachedLengths();
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "clearBody");
    }