netbeans12.5无法添加jar文件，外部的project添加依赖也成不了

你换一个版本试试

<!-- https://mvnrepository.com/artifact/nz.ac.waikato.cms.weka/WekaExcel -->
<dependency>
    <groupId>nz.ac.waikato.cms.weka</groupId>
    <artifactId>WekaExcel</artifactId>
    <version>1.0.6</version>
</dependency>