还有，你使用的是MP的什么版本？

正常情况下不应该报错啊，数据库中有id字段吗？还有你没必要使用两个QueryWrapper变量，用一个设置查询条件即可。

@Builder注解不用去掉，User实体类增加两个注解即可

@AllArgsConstructor

@NoArgsConstructor

https://github.com/AllenHv/test

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.thdbd</groupId>
  <artifactId>first</artifactId>
  <version>1.0-SNAPSHOT</version>

  <!--Spring Boot Starter父工程-->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.7.RELEASE</version>
    <relativePath/>
  </parent>

  <dependencies>
    <!--SpringBoot启动器-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <!--SpringBoot test启动器-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-test</artifactId>
      <scope>test</scope>
    </dependency>
    <!-- Lombok简化JAVA代码 -->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
    <!-- Mybatis-Plus启动器 -->
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.1.2</version>
    </dependency>
    <!-- Mysql JDBC 不用指定version，依赖的spring jdbc已指定 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.1.9.RELEASE</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

以上是我的pom

/**
 * 名字里包含"A",且年龄小于20的
 */
@Test
public void selectByWrapperSuper1(){
    QueryWrapper<User> query = Wrappers.query();
    query.like("name", "A")
            .lt("age", 40);
    List<User> userList = userMapper.selectList(query);
    userList.forEach(System.out::println);
}

有Id字段的,上面这串代码可以查询到结果.