code: synchronized final JsMsgPart getHdr2IfFluffed() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              if (hdr2 == null)
                  SibTr.debug(this, tc, "getHdr2IfFluffed returning null");
          }
          return hdr2;
      }
docs: Get the JsMsgPart which contains the JMF Message described by the
  JsHdr2 schema if it is already fluffed up (i.e. cached).
  If the part is not already fluffed and cached, just return null as the caller
  does NOT want to fluff it up.
  
  @return JsMsgPart The message part described by the JsHdr2 schema, or null