struts+spring+hibernate多用户并发问题

//DAO层接口 
public interface IbaseDAO { 
  public Object saveObject(Object obj); 

  public void saveObject(Collection list); 

  public boolean deleteObject(Object obj); 

  public void deleteObject(Collection list); 

  public Object findObject(Class objclass,java.io.Serializable id); 

 } 

//Service层 
public interface IbaseService { 
  public Object saveObject(Object obj); 

  public void saveObject(Collection list); 

  public boolean deleteObject(Object obj); 

  public void deleteObject(Collection list); 

  public boolean deleteObject(Class objclass,Integer strId); 

  public Object findObject(Class objclass,java.io.Serializable id); 

} 

//Action层通过如下代码调用 
BaseService service=this.getObject("BaseService"); 
service.save(obj);