code: public String getWritableLocation() {
          String writableLocation = getWsLocationAdmin().resolveString("${server.output.dir}/workarea/" + UUID.randomUUID() + "/");
          if (writableLocation == null) {
              IOException ioe = new IOException(TraceNLS.getFormattedMessage(this.getClass(),
                                                                             APIConstants.TRACE_BUNDLE_FILE_TRANSFER,
                                                                             "NO_WRITE_LOCATION",
                                                                             null,
                                                                             "CWWKX0128E: There are no configured writable locations on the routing server."));
              throw ErrorHelper.createRESTHandlerJsonException(ioe, null, APIConstants.STATUS_BAD_REQUEST);
          }
  
          return writableLocation;
      }
docs: Return a unique directory within the workarea directory