I am using XSSFWorkbook for parsing xlsx files (only reading data).

For XSSFWorkbook creation I am using following constructor:

XSSFWorkbook(String path)

After testing my solution I discovered that there is some unexpected non-transparent undesired behavior:

after closing workbook (I am using try with resources construction) source file is rewritten updated by its compressed version; this is unexpected for me since file is opened only for reading data.

Using following workaround changes this behavior:

static Workbook getWorkbook(String fullFileName) throws IOException {
        try {
            return new XSSFWorkbook(OPCPackage.open(fullFileName, PackageAccess.READ));
        } catch (InvalidFormatException e) {
            throw new IOException(e.toString(), e);
        }
    }

Library version used in my solution is 5.2.5 (not present in version dropdown).