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### 60.3. 查找main类
如果你没有使用`Repackager.setMainClass()`指定一个main类，该repackager将使用[ASM](http://asm.ow2.org/)去读取class文件，然后尝试查找一个合适的，具有`public static void main(String[] args)`方法的类。如果发现多个候选者，将会抛出异常。