Scala项目创建问题汇总

朱雀 2023-07-07 08:41 7阅读 0赞

## 问题1： ##

Some problems were encountered while building the effective model for org.lee:scala-train:jar:1.0
    'build.plugins.plugin.version' for org.scala-tools:maven-scala-plugin is missing. @ line 51, column 15
    'build.plugins.plugin.version' for org.apache.maven.plugins:maven-eclipse-plugin is missing. @ line 69, column 15
    It is highly recommended to fix these problems because they threaten the stability of your build.
    For this reason, future Maven versions might no longer support building such malformed projects.

loading Consumer, class file 'H:\Program Files\jdk1.8.0_121\jre\lib\rt.jar(java/util/function/Consumer.class)' is broken

**解决方案：**  
这是因为IDEA创建Scala的Maven项目时`默认`导入的是`2.7.0`版本，而我本机安装的是2.11.0版本，所以修改`pom.xml`文件scala版本号即可：

## 问题2： ##

App.scala:7: error: not found: type Application

**解决方案：**  
这是因为用IDEA创建Scala项目时默认会创建一个`App.scala`类，该类是继承`Application`类的，而scala 2.9以后的版本废弃了Application而是启用了App类，所以`删掉该自动创建的类即可，或者修改该类继承App类`，具体说明可以[参考链接][Link 1]。  
例如：

object App extends App { 
      println( "Hello World!" )
    }

## 问题3： ##

error: error while loading JUnit4, Scala signature JUnit4 has wrong version

**解决方案：**  
将Maven自动生成的`test`目录下的`MySpec`文件删除即可  
![在这里插入图片描述][20200222115055235.png]

编译且运行成功：  
![在这里插入图片描述][20200222115331730.png]

[Link 1]: https://stackoverflow.com/questions/26176509/why-does-2-11-1-fail-with-error-not-found-type-application
[20200222115055235.png]: https://img-blog.csdnimg.cn/20200222115055235.png
[20200222115331730.png]: https://img-blog.csdnimg.cn/20200222115331730.png