Maven多模块MyMetaObjectHandler失效解决方案

Maven多模块项目中MyMetaObjectHandler自动填充日期未生效的解决方案

在Maven多模块项目中，使用MyBatis-Plus的MyMetaObjectHandler进行自动填充日期字段时，可能会遇到配置未生效的问题。以下是常见原因及解决方法：

检查MyMetaObjectHandler的实现类

确保自定义的MyMetaObjectHandler实现类已正确继承MetaObjectHandler并重写方法：

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime", new Date(), metaObject);
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }
}

验证组件扫描路径

多模块项目中需确保主模块的@SpringBootApplication能扫描到子模块的组件：

@SpringBootApplication(scanBasePackages = {
    "com.main.module",
    "com.sub.module.handler" 
})

检查字段注解配置

实体类字段必须添加@TableField注解并指定填充策略：

@TableField(fill = FieldFill.INSERT)
private Date createTime;

@TableField(fill = FieldFill.INSERT_UPDATE)
private Date updateTime;

确认依赖传递正确

在子模块的pom.xml中确保包含mybatis-plus-boot-starter依赖：

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.3.1</version>
</dependency>

排除配置冲突

检查是否有多余的MyBatis配置覆盖了自动填充行为，如自定义的SqlSessionFactoryBean需保留默认配置。

日志调试

启用DEBUG日志查看自动填充是否触发：

logging.level.com.baomidou.mybatisplus.core.handlers=DEBUG

多数据源特殊处理

若项目使用多数据源，需确保MyMetaObjectHandler在每个SqlSessionFactory中都能被注入：

@Bean
public GlobalConfig globalConfig(MyMetaObjectHandler metaObjectHandler) {
    GlobalConfig globalConfig = new GlobalConfig();
    globalConfig.setMetaObjectHandler(metaObjectHandler);
    return globalConfig;
}

版本兼容性检查

确认MyBatis-Plus版本与Spring Boot版本匹配，建议使用官方推荐的版本组合。可通过查看官方文档获取最新兼容矩阵。

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