code: public int getReturnCode() {
          long returnCode = this.stagingByteBuffer.getLong(RETURN_CODE_INDEX * 8);
          if (returnCode > Integer.MAX_VALUE) {
              AsyncException ae = new AsyncException("Return code value invalid");
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, "Invalid value returned for return code, exception: " + ae.getMessage());
              }
              FFDCFilter.processException(ae, getClass().getName(), "227", this);
              return Integer.MAX_VALUE;
          }
          return (int) returnCode;
      }
docs: Returns the result code for the operation where the operation has
  completed.
  
  @return the platform-specific return code.