I am trying to make a java program that auto create in-cell dropdown lists 
in invidual cells.
My code (it runs without error but my sheet doesn't show the list):

    
Sheets service = getSheetsService();
    SetDataValidationRequest setReq = new SetDataValidationRequest();
    
    GridRange mRange = new GridRange();
    mRange.setSheetId(sheet.getProperties().getSheetId());
    mRange.setStartColumnIndex(6);
    mRange.setEndColumnIndex(6);
    mRange.setStartRowIndex(2);
    mRange.setEndRowIndex(1001);
    
    //set range for request
    setReq.setRange(mRange);
    
    String[] items = {"teen","18-24","25-34","35++"};
    BooleanCondition bc = new BooleanCondition();
    bc.setType("ONE_OF_LIST");
    List<ConditionValue> listItem = new ArrayList<>();
    
    for (String item : items) {
    listItem.add(new ConditionValue().setUserEnteredValue(item));
    }
    bc.setValues(listItem);
    
    //set rule
    setReq.setRule(new DataValidationRule().setCondition(bc).setShowCustomUi
(true).setStrict(true));
    
    Request rqDataValidation = new Request();
    rqDataValidation.setSetDataValidation(setReq);
    
    List<Request> rqList = new ArrayList<>();
    rqList.add(rqDataValidation);
    batchUpdate.setRequests(rqList);
    System.out.println(batchUpdate.toString());
    service.spreadsheets().batchUpdate(spreadsheetId,batchUpdate).execute();


And : 
System.out.println(batchUpdate.toString());
print the json string of request:

   
 {
    requests = [{
    setDataValidation = {
    range = {
    endColumnIndex = 6,
    endRowIndex = 1001,
    sheetId = *mySheetID*, //it is an int in real
    startColumnIndex = 6,
    startRowIndex = 2
    },
    rule = {
    condition = {
    type = ONE_OF_LIST,
    values = [{
    userEnteredValue = teen
    }, {
    userEnteredValue = 18 - 24
    }, {
    userEnteredValue = 25 - 34
    }, {
    userEnteredValue = 35++
    }]
    },
    showCustomUi = true,
    strict = true
    }
    }
    }]
    }


I tried set ProtectedRange and it works perfectly, but can't make the 
dropdown list works. Google Sheets API document is poor.

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