这个 Bug 是否已经存在：

• 我确定已经把 MyBatis-Flex 升级到最新版本 v1.7.5，并已搜索过现有的问题 (https://gitee.com/mybatis-flex/mybatis-flex/issues)

如何复现：

public static void main(String[] args) {
    Environment environment = new Environment("mybatisFlex", new JdbcTransactionFactory(), new DelegatingDataSource());
    FlexConfiguration configuration = new FlexConfiguration(environment);
    FlexGlobalConfig globalConfig = FlexGlobalConfig.getDefaultConfig();
    globalConfig.setConfiguration(configuration);
    FlexGlobalConfig.setConfig("mybatisFlex", globalConfig, true);
    configuration.addMapper(AccountMapper.class);
    globalConfig.setDbType(DbType.MYSQL);

    IAccountServiceImpl service = new IAccountServiceImpl();
    AccountMapper baseMapper = Mappers.ofMapperClass(AccountMapper.class);
    Field field = ReflectUtil.getField(ServiceImpl.class, "mapper");
    ReflectUtil.setFieldValue(service, field, baseMapper);
    System.out.println(service.updateChain()
            .from(ACCOUNT)
            .set(Account::getAge, 18)
            .and(ACCOUNT.ID.ge(10)).toSQL());
}

预期结果：

正常输出构建的sql语句

实际结果：

java.lang.RuntimeException: Can not newInstance class: club.bigtian.study.domain.Account_$$_jvsta81_0
at com.mybatisflex.core.util.ClassUtil.newInstance(ClassUtil.java:168)
at com.mybatisflex.core.update.ModifyAttrsRecordProxyFactory.get(ModifyAttrsRecordProxyFactory.java:58)
at com.mybatisflex.core.util.UpdateEntity.of(UpdateEntity.java:35)
at com.mybatisflex.core.update.UpdateChain.createEntity(UpdateChain.java:84)
at com.mybatisflex.core.update.UpdateChain.(UpdateChain.java:68)
at com.mybatisflex.core.update.UpdateChain.create(UpdateChain.java:90)
at com.mybatisflex.core.service.IService.updateChain(IService.java:648)
at club.bigtian.study.service.impl.MybatisFlexSqlPreview.main(MybatisFlexSqlPreview.java:36)
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "com.mybatisflex.core.update.UpdateWrapper.set(com.mybatisflex.core.util.LambdaGetter, Object, boolean)" because "this.entityWrapper" is null
at com.mybatisflex.core.update.UpdateChain.set(UpdateChain.java:107)
at com.mybatisflex.core.update.UpdateChain.set(UpdateChain.java:39)
at com.mybatisflex.core.update.PropertySetter.set(PropertySetter.java:123)
at club.bigtian.study.service.impl.MybatisFlexSqlPreview.main(MybatisFlexSqlPreview.java:38)
Disconnected from the target VM, address: '127.0.0.1:54054', transport: 'socket'

截图或视频：

关联版本：

1.7.5