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）
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