hibernate问题小结

could not initialize proxy - no Session

延迟加载问题(实体类有依赖关系),我的解决方法：在web.xml中添加以下内容(其实不用load用get也会出现这个问题)

<filter>  
        <filter-name>openSessionInViewFilter</filter-name>  
        <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>  
        <init-param>  
            <param-name>singleSession</param-name>  
            <param-value>true</param-value>  
        </init-param>  
    </filter>
         
    <filter-mapping> 
     <filter-name>openSessionInViewFilter</filter-name> 
     <url-pattern>*.do</url-pattern> 
    </filter-mapping>

生成json的时候出现There is a cycle in the hierarchy(死循环)

Model之间有循环包含关系

JsonConfig jsonConfig = new JsonConfig();

jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);