怎么我按照一样的依赖包，却找不到ProtostuffIOUtil工具类；

<dependency>
   <groupId>com.dyuproject.protostuff</groupId>
   <artifactId>protostuff</artifactId>
   <version>1.0.8</version>
</dependency>
<dependency>
   <groupId>com.dyuproject.protostuff</groupId>
   <artifactId>protostuff-runtime</artifactId>
   <version>1.0.8</version>
</dependency>