在eclipse中，使用mavenimport了一個工程，但是在對某一個類進行F3/F4/ctrl+alt+H操作的時候報錯：“the resource is not on the build path of a java project”。
這種情況也常常發生在重新打開eclipse時。
原因：在該工程的構建路徑中找不到該類。
解決方法：
1. 找到buildpath下面的src下的文件remove掉，然后重新加上去，此時會更新所有目錄。
2. 關閉該類，重新打開即可
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