play1 数据存入数据库问题, 400 请求报错 

我做上传图片的功能,可是在保存图片信息到数据库时候出错 ,不会改啊
PersistenceException occured : org.hibernate.PropertyAccessException: could not set a field value by reflection setter of models.Photo.pId

下面是Model下的 Photo类

@Entity @Table(name="T_PHOTO") public class Photo extends Model {//贴片电阻封装尺寸 @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name="p_id") public int pId;			//ID

@Required
@Column(name="p_name")
public String pName;	//型号

@Required
@Column(name="p_path")
public String pPath;	//图片路径

@Column(name="p_dec")
public String pDec;		//图片描述
	
public String toString() {
    return "图片名:" + pName;
}

public Photo(String pName,String pPath,String pDec){
	this.pName = pName;
	this.pPath = pPath;
	this.pDec = pDec;
}

}

public class Admin extends Controller {	
	public static void addPhoto(File photo,String dec){//上传图片
		String pName = photo.getName();
		String pPath = "public/images/smd/" + pName;
		Photo Dphoto = Photo.find("byPName", pName).first();
		if(Dphoto == null){
			Files.copy(photo, Play.getFile(pPath));		//保存图片
			Photo news = new Photo(pName,pPath,dec);
			news.save();								//保存到数据库
			render("Admin/addSuccess.html",pName);
		}

	}
}

求大神帮忙啊