What does "[Ljava.lang.Object;@" mean?

Question

I am filling a Google spreadsheet from a form. The code writes some information into the spreadsheet, it always does it right, but before writing what it is supposed to, it writes [Ljava.lang.Object;@1c7aa4fc (or something like that) on the last row in the spreadsheet. Why is it appearing there?

The code for writing into the spreadsheet:

for (var p = 1; p < data.length; p++) {
    var ppopis = data[p][2]; 
    var sstav = data[p][7];
    var ukonceno_dne = data[p][9];
    var cell = spred2.getRange("H"+(p+1));
    var celll = spred2.getRange("J"+(p+1));
    if(nadpis_pole == ppopis && vlozena_hodnota == "Zrušeno") {
      cell.clear();
      cell.setValue("Zrušeno");
      if(ukonceno_dne == "" || ukonceno_dne == null){
        celll.setValue(dnesni_datum);
      }
    } else if (nadpis_pole == ppopis && vlozena_hodnota == "Vráceno") {
      cell.clear();
      cell.setValue("Vráceno");
      if(ukonceno_dne == "" || ukonceno_dne == null){
        celll.setValue(dnesni_datum);
      }
    }
  }

Thanks :)

Answer 1

App script has underlying data structure built up on java...Ljava.lang..... represents object notation in Java to indicate any object such as Array,JSON in GAS.To get actual value try toString() (or) JSON.Stringify() and check whether you have a value.