How do I resolve errors about incompatible types?

I study java projects on IntelliJ Then I found an error about incompatible types in the try catch block This is part of my code:

try (HSSFWorkbook workbook = new HSSFWorkbook(new POIFSFileSystem(new FileInputStream(System.getProperty("user.home") + "D:\\Users\\john\\Desktop\\RBBNCaseManagementTool\\src\\home\\data.xls")))) {

            HSSFSheet filtersheet = workbook.getSheetAt(0);
            int cellnum = filtersheet.getRow(0).getLastCellNum();
            int lastRow = filtersheet.getLastRowNum();
            HSSFCell cellVal1;
            HSSFCell cellVal2;
            HSSFCell cellVal3;

Solution

The HSSF workbook class implements the workbook interface

In POI 4 X, the workbook interface implements autoclosable and closable

At POI 3.11 from 3.11 X, the workbook interface only implements closed

(before 3.11, workbooks obviously didn't even implement closeable; see https://poi.apache.org/changes.html#3.11 and https://bz.apache.org/bugzilla/show_bug.cgi?id=56537 )

Therefore, if you want to use try with resources to manage HSSF workbook instances, the simple solution is to upgrade to POI 4.0 or later