Importing Apache POI cell library

Question

I am writing a project, and the results should be saved to Excel file ( .xlsx ). I added the following dependencies in pom.xml :

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.8-beta3</version>
</dependency>

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.16-beta1</version>
</dependency>

All the imported libraries are working properly, such as:

import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

except the one related to cells. It must have the following imported statement:

import org.apache.poi.ss.usermodel.Cell;

But it does not work. I do not know what is the problem.

Answer 1

As per this Apache POI FAQ entry - Mixing POI jars between releases is not supported .

You should change your pom to refer to the same, latest version of Apache POI for everything, eg

<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi-ooxml</artifactId>
  <version>3.16-beta1</version>
</dependency>

<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>3.16-beta1</version>
</dependency>

With that in place, you'll be able to access the Cell class without issues

Answer 2

如果下载了此 jar（即在pom.xml中指定的jar），则将看到Cell类存在，因此问题必须出在其他地方，例如IDE缓存（对于IntelliJ，请尝试重新导入maven项目，对于Eclipse – Don不幸的是不知道）。