如何修复java。lang.ClassCastException:。审查在加载器“应用”的未命名模块中

Question

我对一个特殊的班级助手做了一些改变。java，任何时候我尝试将其转换为一个特定的endpoint，我都会收到这个错误消息。堆栈跟踪指向Helpers类。

JAVAClassCastException:class com。聪明的制动辅助系统。模型事务不能强制转换到com类。聪明的制动辅助系统。模型查看（com.cleer.bas.model.Transaction和com.cleer.bas.model.Review位于加载器“app”的未命名模块中）

这是助手类的样子

public static InputStream writeToExcel(CompletableFuture<ArrayList<Review>> data) throws Exception {

        //Blank workbook
        try (XSSFWorkbook workbook = new XSSFWorkbook()) {

            //Create a blank sheet
            XSSFSheet sheet = workbook.createSheet("transaction report");
            AtomicInteger rowNum = new AtomicInteger(1);
            AtomicBoolean isHeaderSet = new AtomicBoolean(false);
            data.get().forEach(review -> {
                if (!isHeaderSet.get()){
                    createHeader(review, sheet);
                    isHeaderSet.set(true);
                }
                XSSFRow row = sheet.createRow(rowNum.getAndIncrement());
                ObjectMapper mapObject = new ObjectMapper();
                Map<String, Object> mapObj = mapObject.convertValue(review, Map.class);
                AtomicInteger cellNum = new AtomicInteger();
                mapObj.forEach((key, value) -> {
                    XSSFCell cell = row.createCell(cellNum.getAndIncrement());
                    cell.setCellValue(key);
                    if (value instanceof Integer)
                        cell.setCellValue((Integer) value);
                    else if (value instanceof BigDecimal)
                        cell.setCellValue(((BigDecimal) value).doubleValue());
                    else if (value instanceof Long)
                        cell.setCellValue((Long) value);
                    else if (value instanceof Boolean)
                        cell.setCellValue((Boolean) value);
                    else cell.setCellValue((String) value);

                });
            });
            try {
                //Write the workbook in file system
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                workbook.write(bos);
                byte[] barray = bos.toByteArray();
                InputStream is = new ByteArrayInputStream(barray);
//                InputStream is = new FileInputStream("transaction.xlsx");
//                workbook.write(is);
                System.out.println("transaction.xlsx written successfully on disk.");
                return is;
//                out.close();
            } catch (Exception e) {
                e.printStackTrace();
                throw new Exception(e.getMessage());
            }
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e.getMessage());

        }
    }
private static void createHeader(Review review, XSSFSheet sheet) {
        XSSFRow row = sheet.createRow(0);
        ObjectMapper mapObject = new ObjectMapper();
        Map<String, Object> mapObj = mapObject.convertValue(review, Map.class);
        AtomicInteger cellNum = new AtomicInteger();
        mapObj.forEach((key, value) -> {
            XSSFCell cell = row.createCell(cellNum.getAndIncrement());
            cell.setCellValue(key);
        });
    }

我想不出我返回的是哪种类型的交易，而不是回顾。这里是我在服务中调用helper类的地方。

 public InputStream downloadReviewReport(UriInfo uriInfo) throws Exception {
        MultivaluedMap<String, String> queryParams = uriInfo.getQueryParameters();
        String userID = queryParams.getFirst("userID");
        CompletableFuture<ArrayList<Review>> reviews = reviewRepository.fetchUserDetailsBatches(filterTransaction(queryParams, userID));
        return Helpers.writeToExcel(reviews);
    }

Answer 1

在我的数据库配置中，我一直在调用另一个类。将其更改为适当的类类型解决了问题