调试时Eclipse中找不到源错误

Question

我在调试时得到以下错误。当我设置断点并进行调试时，会发现未找到的来源＆＃39;错误。

我已点击＆＃34;编辑源查找路径＆＃34;在Eclipse中添加我的项目。但它不起作用。请建议

Exception in thread "main" java.lang.NullPointerException
error line String value = cell.getStringCellValue();


     package ExcelPractice;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFEvaluationWorkbook;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ExcelTest {    
    public static void main(String[] args) throws IOException {     
     String value = getExcelData("sheet1",2,2);
     System.out.println(" Cell Value " + value);     
    }   
    public static String getExcelData( String sheetName , int rowNum ,int cellNum) throws IOException{      
         FileInputStream fInput = new FileInputStream("C:\\Users\\xxxx\\Excel Data.xlsx");
         XSSFWorkbook wb = new XSSFWorkbook(fInput);
         XSSFSheet sheet = wb.getSheet(sheetName);
         XSSFRow row = sheet.getRow(rowNum);
         XSSFCell cell = row.getCell(cellNum);//breakpoint is here
         String value = cell.getStringCellValue();      
        return value;
    }
}

错误截图

Answer 1

对于标准Java Runtime中的类，最简单，最简单的答案始终是安装JDK，并使用它编译和运行Java应用程序。理想情况下，您的Installed JREs首选项页面应仅列出JDK。