mybatis中使用InsertProvider注解报错解决全过程

@InsertProvider(method = "insertlist",type=SqlProvider.class)
 public int insertInnerTable(List list,String dbTable);

try {
      this.sqlSourceParser = new SqlSourceBuilder(config);
      this.providerType = (Class<?>) provider.getClass().getMethod("type").invoke(provider);
      providerMethodName = (String) provider.getClass().getMethod("method").invoke(provider);
      for (Method m : this.providerType.getMethods()) {
        if (providerMethodName.equals(m.getName())) {
          if (m.getParameterTypes().length < 2
              && m.getReturnType() == String.class) {
            this.providerMethod = m;
            this.providerTakesParameterObject = m.getParameterTypes().length == 1;
          }
        }
      }
    } catch (Exception e) {
      throw new BuilderException("Error creating SqlSource for SqlProvider.  Cause: " + e, e);
    }

@InsertProvider(method = "insert",type=SqlProvider.class)
 public int insert(SqlContext sqlContext);
在SqlProvider中对应的方法为
public String insert(SqlContext sqlContext){
      ........
}

//insert into user(username,password) values(?,?)
@Insert("insert into user(username,password) values(#{username},#{password})")
void save(User user);

import com.sikiedu.springbootssm.entity.User;
public class Userprovider {    
    public String saveUser(User user)
    {
        if(user.getId()==null)
        {
            return "insert into user(username,password) values(#{username},#{password}) ";
        }
        else
        {
            return "insert into user values(#{id},#{username},#{password})";
        }
    }    
}

@InsertProvider(type = Userprovider.class,method="saveUser")
void save (User user);