when run Java Vuser scripts in LR meet error 'Cannot Reply due to compilation errors '

/*
 * LoadRunner Java script. (Build: _build_number_)
 * 
 * Script Description: 
 *                     
 */
import com.lr.test.*;
import lrapi.lr;
import com.hp.ecc.poc.connection.DataSource

public class Actions extends DataSource
{
	
	
	
	
	public int init() throws Throwable {
		
		
		return 0;
	}//end of init


	public int action() throws Throwable {
		
		//HelloWorld.main((String[])null);
		//return 0;
		
		
	
	}//end of action


	public int end() throws Throwable {
		return 0;
	}//end of end
}

Above is the Actions Code. And the classpath in RunTime Setting was assgined to src path of source code of applications.

Cause I am a newbie ,so could anybody give me a suggesstion?