This compilation unit is not on the build path of a Java project 解决办法:大致是因为项目文件缺失
解决方法：
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>dmp_pj</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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