Spring Boot 中 spring.jpa.open-in-view 使用注意点

本篇记录我在使用Spring JPA中遇到的问题。

在使用Spring Boot JPA时，open-in-view 选项默认为true。启动时在日志中会出现警告。

WARN 9560 — [ restartedMain] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning

按照日志要求将 open-in-view=false。再次启动，如果在实体类中外键字段使用了懒加载模式，在视图层中调用数据时，则会出现 no session 异常。

解决方法：手动注册OpenEntityManagerInViewFilter过滤器，改变session的生命周期，当web请求关闭时才结束session。

@SpringBootApplication public class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } @Bean public FilterRegistrationBean<OpenEntityManagerInViewFilter> registerOpenEntityManagerInViewFilterBean() { FilterRegistrationBean<OpenEntityManagerInViewFilter> registrationBean = new FilterRegistrationBean<>(); OpenEntityManagerInViewFilter filter = new OpenEntityManagerInViewFilter(); registrationBean.setFilter(filter); registrationBean.setOrder(5); return registrationBean; } } 

注：

• 如果使用的是 JPA 则对应OpenEntityManagerInViewFilter，Hibernate对应OpenSessionInViewFilter

疑问：

• registrationBean.setOrder(5)，order为什么是5
• OpenSessionInViewInterceptor&OpenSessionInViewFilter,OpenEntityManagerInViewInterceptor&OpenEntityManagerInViewFilter这几个类的区别以及使的的场景

本文地址：https://blog.csdn.net/xiaohe00happy/article/details/108237543