在eclipse中，使用mavenimport了一个工程，但是在对某一个类进行F3/F4/ctrl+alt+H操作的时候报错：“the resource is not on the build path of a java project”。
这种情况也常常发生在重新打开eclipse时。
原因：在该工程的构建路径中找不到该类。
解决方法：
1. 找到buildpath下面的src下的文件remove掉，然后重新加上去，此时会更新所有目录。
2. 关闭该类，重新打开即可
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