springboot+mybits的insert出现空指针报错

Question

题目描述

使用springboot+mybits进行数据库插入操作时，使用实体类set数值，会出现报错java.lang.NullPointerException: null

问题出现的环境背景及自己尝试过哪些方法

使用输出，又可以输出实体类里面的内容，并且select可以查询出来

相关代码

具体代码：

        dataIfm.setMd5(md5.toString());
        dataIfm.setUsername(username);
        dataIfm.setProjectName(headName);
        if(dataIfm == null){
            System.out.println("数据为空");
        }else {
            System.out.println(dataIfm.getMd5());
            System.out.println(dataIfm.getProjectName());
            System.out.println(dataIfm.getUsername());
        }
        /*int i = dataIfmService.insertIfm(dataIfm);

mapper：

<mapper namespace="com.gdr.bysj.dao.DataIfmDao" >
  <resultMap id="BaseResultMap" type="com.gdr.bysj.entity.DataIfm" >
    <id column="username" property="username" jdbcType="VARCHAR" />
    <result column="project_name" property="projectName" jdbcType="VARCHAR" />
    <result column="MD5" property="md5" jdbcType="VARCHAR" />
    <result column="Data_type" property="dataType" jdbcType="VARCHAR" />
    <result column="insert_time" property="insertTime" jdbcType="VARCHAR" />
  </resultMap>

<insert id="insertSelective" parameterType="com.gdr.bysj.entity.DataIfm" >
    insert into data_ifm
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="username != null" >
        username,
      </if>
      <if test="projectName != null" >
        project_name,
      </if>
      <if test="md5 != null" >
        MD5,
      </if>
      <if test="dataType != null" >
        Data_type,
      </if>
      <if test="insertTime != null" >
        insert_time,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="username != null" >
        #{username,jdbcType=VARCHAR},
      </if>
      <if test="projectName != null" >
        #{projectName,jdbcType=VARCHAR},
      </if>
      <if test="md5 != null" >
        #{md5,jdbcType=VARCHAR},
      </if>
      <if test="dataType != null" >
        #{dataType,jdbcType=VARCHAR},
      </if>
      <if test="insertTime != null" >
        #{insertTime,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>

实体类：

public class DataIfm {
    private String username;

    private String projectName;

    private String md5;

    private String dataType;

    private String insertTime;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username == null ? null : username.trim();
    }

    public String getProjectName() {
        return projectName;
    }

    public void setProjectName(String projectName) {
        this.projectName = projectName == null ? null : projectName.trim();
    }

    public String getMd5() {
        return md5;
    }

    public void setMd5(String md5) {
        this.md5 = md5 == null ? null : md5.trim();
    }

    public String getDataType() {
        return dataType;
    }

    public void setDataType(String dataType) {
        this.dataType = dataType == null ? null : dataType.trim();
    }

    public String getInsertTime() {
        return insertTime;
    }

    public void setInsertTime(String insertTime) {
        this.insertTime = insertTime == null ? null : insertTime.trim();
    }