[Java知识库]mybatis:ssource is null for getProperty(null “roleId“)报错

pom.xml加入pagehelper插件依赖

<!--分页插件pagehelper-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.11</version>
        </dependency>

application.yml加入pagehelper插件配置

#页插件配置：pagehelper分页
pagehelper:
  helperDialect: mysql
  offsetAsPageNum: true
  rowBoundsWithCount: true
  reasonable: false
  supportMethodsArguments: true
  returnPageInfo: true
  params: count=countSql

UserMapper.xml错误

<!--分页查询-->
  <select id="selectPage"   parameterType="com.example.springboot.entity.User"  resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from user
    <where>
      <if test="user !=null">
          <if test="user.username != null and user.username.trim().length()>0">
              <bind name="usernamePattern" value="'%' + user.username + '%'"/>
              AND username like #{usernamePattern}
          </if>
          <if test="user.nickname != null and user.nickname.trim().length()>0">
              <bind name="nicknamePattern" value="'%' + user.nickname + '%'"/>
              AND nickname like #{nicknamePattern}
          </if>
          <if test="user.roleId != null and user.roleId != ''">
              AND role_id=#{user.roleId}
          </if>
          <if test="user.id != null and user.id != '' ">
              AND id=#{user.id}
          </if>
      </if>

      </where>

UserMapper.xml正确

<!--分页查询-->
  <select id="selectPage"   parameterType="com.example.springboot.entity.User"  resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from user
    <where>
          <if test="user.username != null and user.username.trim().length()>0">
              <bind name="usernamePattern" value="'%' + user.username + '%'"/>
              AND username like #{usernamePattern}
          </if>
          <if test="user.nickname != null and user.nickname.trim().length()>0">
              <bind name="nicknamePattern" value="'%' + user.nickname + '%'"/>
              AND nickname like #{nicknamePattern}
          </if>
          <if test="user.roleId != null and user.roleId != ''">
              AND role_id=#{user.roleId}
          </if>
          <if test="user.id != null and user.id != '' ">
              AND id=#{user.id}
          </if>
      </where>

userMapper.java

  /*分页查询全部*/
    Page<User> selectPage(@Param("user") User user,
                          @Param("pageNum") int pageNum,
                          @Param("pageSize") int pageSize);