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
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