spring解决JPA因EntityManager关闭导致的延迟加载例外问题
使用spring解决JPA因EntityManager关闭导致的延迟加载例外问题，在spring配置文件中加上下面几句即可
<filter>
<filter-name>Spring OpenEntityManagerInViewFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>Spring OpenEntityManagerInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>