启动时报这个错误，但jar包里肯定有这个类的。 about jvm-sandbox HOT 4 CLOSED

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.vbgps</groupId>
  <artifactId>sandbox-clock</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <dependencies>
  	<!-- 
	     沙箱模块的API定义二方包
	     这个二方包可以被声明为provided
	-->
	<dependency>
	    <groupId>com.alibaba.jvm.sandbox</groupId>
	    <artifactId>sandbox-api</artifactId>
	    <version>1.0.9</version>
	</dependency>
	
	<!-- 
	     javax.servlet的三方包
	     在沙箱模块中需要用到HttpServletReuqest和HttpServletResponse
	     整个沙箱模块被放置在Servlet容器中完成加载
	-->
	<dependency>
	    <groupId>javax.servlet</groupId>
	    <artifactId>javax.servlet-api</artifactId>
	    <version>3.0.1</version>
	</dependency>
  </dependencies>
  <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-assembly-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>attached</goal>
                    </goals>
                    <phase>package</phase>
                    <configuration>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
</project>