搜索发现，大致是因为项目文件缺失。
解决办法：找到项目根目录下的.project文件，修改，加入jdt支持，我的项目修改后如下所示↓
- <?xml version="1.0" encoding="UTF-8"?>
- <projectDescription>
- <name>V4</name>
- <comment></comment>
- <projects>
- </projects>
- <buildSpec>
- <buildCommand>
- <name>org.eclipse.jdt.core.javabuilder</name>
- <arguments>
- </arguments>
- </buildCommand>
- </buildSpec>
- <natures>
- <nature>org.eclipse.jdt.core.javanature</nature>
- <nature>org.apache.ivyde.eclipse.ivynature</nature>
- </natures>
- </projectDescription>
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