在eclipse中新建maven project后，会自动生成main\test目录结构，新建一个测试类，然后编辑类文件时，总是提示错误：this compilation unit is not on the build path of a java project。后来在网上找到了解决办法：
- 需要先安装maven eclipse插件 m2eclipse
- 执行命令 mvn eclipse:clean
- 执行命令 mvn eclipse:eclipse
以上操作成功后，问题就解决了！
this compilation unit is not on the build path of a java project
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