# 70.2. spring-boot:findmainclass

`findmainclass`任务是`exejar`内部用于定位声明`main`方法类的，如果构建需要，你可以直接使用该任务，支持属性如下：

| 属性            | 描述                | 是否必需                 |
| ------------- | ----------------- | -------------------- |
| `classesroot` | Java类文件的根目录       | 是（除非指定`mainclass`）   |
| `mainclass`   | 可用于缩减`main`类的查找   | 否                    |
| `property`    | Ant属性必须使用result设值 | 否（没有指定则result会记录日志中） |


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