Exception in thread "main" org.springframework.beans.BeanInstantiationException - 代码天地

Exception in thread "main" org.springframework.beans.BeanInstantiationException

其他 2020-04-08 11:15:19 阅读次数: 0

在这里插入图片描述

本人测试JdbcTemplate时出现的错误，原因是因为应用的实体类没有无参构造函数

这里找到了原因 ：对象的依赖注入使用了set方法注入，如果类中只有有参构造方法，而没有无参构造方法，运行时将会出错。原因是Spring框架的IOC实现使用了Java的反射机制，反射机制将会调用类的无参构造方法创建这个类的对象，而类中存在了[有参]的构造方法，java就不会为这个类生成[无参]构造方法，JVM映射对象时，将会出错。

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转载自blog.csdn.net/qq_40181435/article/details/105350194

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