打开.project文件，从其他可以有运行main的地方copy一个maven的builder过来，补上就好了。
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>xxx</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.m2e.core.maven2Builder</name>
<arguments>
</arguments>
</buildCommand>
...
原因猜测：ecilpse的工程运行main的时候需要builder去提供类路径吧，然后没有builder相当于classpath少了一部分，纯属猜测
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