在eclipse中新建maven project后，會自動生成main\test目錄結構，新建一個測試類，然后編輯類文件時，總是提示錯誤：this compilation unit is not on the build path of a java project。后來在網上找到了解決辦法：
- 需要先安裝maven eclipse插件 m2eclipse
- 執行命令 mvn eclipse:clean
- 執行命令 mvn eclipse:eclipse
以上操作成功后，問題就解決了！
this compilation unit is not on the build path of a java project
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This compilation unit is not on the build path of java project （此編譯單元不在java項目的生成路徑上）
the resource is not on the build path of a java project錯誤
【eclipse】eclipse報錯：the resource is not on the build path of a java project
運行java+eclipse報錯The project was not built since its build path is incomplete. Cannot find the class file for java.lang.Object. Fix the build path then try building this project
Java Build Path 詳解
eclipse java build path
Fix missing src/main/java folder in Eclipse Maven Project – 2 build path entries are missing
Java問題解決：The project cannot be built until build path errors are resolved
Cannot start compilation: the output path is not specified for module "salesystem". Specify the output path in Configure Project.
Cannot start compilation: the output path is not specified for module "demo". Specify the output path in the Project Structure dialog.