us 500 - Could not write content: could not initialize proxy - no Session (through reference chain: cn.jiedada.aisell.common.UIPage["rows"]->java.util.UnmodifiableRandomAccessList[0]->cn.jiedada.aisell.domain.Employee["department"]->cn.jiedada.aisell.domain.Department_$$_jvst583_0["id"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy - no Session (through reference chain: cn.jiedada.aisell.common.UIPage["rows"]->java.util.UnmodifiableRandomAccessList[0]->cn.jiedada.aisell.domain.Employee["department"]->c

因为hibernate的底层是通过session来实现CRUD，所以当关闭EntityManager时候所以会出现这个异常

在web.xml中配置

<!--解决获取部门懒加载noSession，配置JPA:OpenEntityMangerInViewFilter/Hibernater:OpenSessionMangerInViewFilter-->
    <!--Spring集成JPA必须配置-->
    <filter>
        <filter-name>OpenEntityMangerInViewFilter</filter-name>
        <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>OpenEntityMangerInViewFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
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原文链接：https://blog.csdn.net/qq_42136250/article/details/88581844

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