【異常】java.util.ConcurrentModificationException: null

// 需要補充的資料項
List<InsureSupplyDTO> waitingInsureSupplys = queryInsureSupplys(offerId);
// 配送位址放在最後
InsureSupplyDTO temp = new InsureSupplyDTO();
for (InsureSupplyDTO insureSupplyDTO : waitingInsureSupplys) {
    if (insureSupplyDTO.getItemCode().equals(DictionaryDTO.VALIDATE_RULE_DELIVERY_MODE)) {
        temp = insureSupplyDTO;
        waitingInsureSupplys.remove(insureSupplyDTO);
    }
}
waitingInsureSupplys.add(temp);
           

換成普通for循環

// 需要補充的資料項
List<InsureSupplyDTO> waitingInsureSupplys = queryInsureSupplys(offerId);
// 配送位址放在最後
InsureSupplyDTO temp = new InsureSupplyDTO();
for (int i = ; i < waitingInsureSupplys.size(); i++) {
    InsureSupplyDTO insureSupplyDTO = waitingInsureSupplys.get(i);
    if (insureSupplyDTO.getItemCode().equals(DictionaryDTO.VALIDATE_RULE_DELIVERY_MODE)) {
        temp = insureSupplyDTO;
        waitingInsureSupplys.remove(i);

        break;
    }
}
waitingInsureSupplys.add(temp);