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This compilation unit is not on the build path of a Java project 解决办法​

 
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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] view plaincopy
 
  1. <?xml version="1.0" encoding="UTF-8"?>  
  2. <projectDescription>  
  3.     <name>V4</name>  
  4.     <comment></comment>  
  5.     <projects>  
  6.     </projects>  
  7.     <buildSpec>  
  8.         <buildCommand>  
  9.             <name>org.eclipse.jdt.core.javabuilder</name>  
  10.             <arguments>  
  11.             </arguments>  
  12.         </buildCommand>  
  13.     </buildSpec>  
  14.     <natures>  
  15.         <nature>org.eclipse.jdt.core.javanature</nature>  
  16.         <nature>org.apache.ivyde.eclipse.ivynature</nature>  
  17.     </natures>  
  18. </projectDescription>  
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