Question

当我尝试以下代码时，我在NullPointerException附近获得jdbcTemplate.queryForObject。我正在尝试针对Netezza数据库的简单select语句。下面是我的代码设置方式的示例：

类AccessDOA.java：

package WebService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

public class AccessDAO {

    @Autowired
    public JdbcTemplate jdbcTemplate;

    public Person getUserDetails() {
        String query = "Select name, email, age from user LIMIT 1";
        return jdbcTemplate.queryForObject(query, (resultSet, i) -> {
            return new Person(resultSet.getString(1), resultSet.getString(2), resultSet.getInt(3));
        });
    }
}

Controller正如此调用它：

PersonController.java

package WebService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class PersonController {

@RequestMapping(value = "/person")
public
@ResponseBody
Person dailyStats(@RequestParam Integer id) {
    System.out.println("got this far");

    AccessDAO newConn = new AccessDAO();
    Person newPerson = new Person();

    newPerson = newConn.getUserDetails();

    return newPerson;
}
}

我最初有代码在PersonController内调用我的数据库，它完美地运行并将person对象返回给邮递员。但是我希望将我的数据库调用保留在他们自己的类中，所以我一直在将这个逻辑移到AccessDAO.java。

Java Spring JdbcTemplate java.lang.NullPointerException

0 个答案: