Write operations are not allowed in read-only mode的错误解决
2018-01-30 10:55
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今天在做项目时 spring 和hibernate整合的问题:
开启OpenSessionInViewFilter来阻止延迟加载的错误的时候抛出了这个异常:
org.springframework.dao.InvalidDataAccessApiUsageException错误
但是在我们开启OpenSessionInViewFilter这个过滤器的时候FlushMode就已经被默认设置为了MANUAL!
如果FlushMode是MANUAL或NEVEL,在操作过程中 hibernate会将事务设置为readonly,所以在增加、删除或修改操作过程中会出现如下错误:
解决办法:
直接修改OpenSessionInViewFilter过滤器的配置,配置过滤器的时候配置就是在一般的配置里面加上下面部分就可以了,直接指定flushMode的配置就OK了:
下面是配置文件:(web.xml)
<!-- 使用Hibernate延迟加载,会因Session被关闭,导致延迟加载数据异常,等到返回响应后才关闭session -->
<!-- 一定要在struts2过滤器之前 -->
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
<init-param>
<param-name>sessionFactoryBeanName</param-name>
<param-value>sessionFactory</param-value>
</init-param>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>flushMode</param-name>
<param-value>AUTO</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
总结:网上说了很多种方法,但是试了几种都没有效果,实际原因是因为配置的OpenSessionInView将FlushMode默认设置为了MANUAL!只要手动将设置为AUTO就OK了,这种方法最好理解;其次有一种方法是配置事务边界,个人觉得不容易配置,很容易漏配,所以将FlushMode设置为了AUTO可以一劳永逸!
开启OpenSessionInViewFilter来阻止延迟加载的错误的时候抛出了这个异常:
org.springframework.dao.InvalidDataAccessApiUsageException错误
但是在我们开启OpenSessionInViewFilter这个过滤器的时候FlushMode就已经被默认设置为了MANUAL!
如果FlushMode是MANUAL或NEVEL,在操作过程中 hibernate会将事务设置为readonly,所以在增加、删除或修改操作过程中会出现如下错误:
org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.NEVER) turn your Session into FlushMode.AUTO or remove 'readOnly' marker from transaction definition;
解决办法:
直接修改OpenSessionInViewFilter过滤器的配置,配置过滤器的时候配置就是在一般的配置里面加上下面部分就可以了,直接指定flushMode的配置就OK了:
<init-param> <param-name>flushMode</param-name> <param-value>AUTO</param-value> </init-param>
下面是配置文件:(web.xml)
<!-- 使用Hibernate延迟加载,会因Session被关闭,导致延迟加载数据异常,等到返回响应后才关闭session -->
<!-- 一定要在struts2过滤器之前 -->
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
<init-param>
<param-name>sessionFactoryBeanName</param-name>
<param-value>sessionFactory</param-value>
</init-param>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>flushMode</param-name>
<param-value>AUTO</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
总结:网上说了很多种方法,但是试了几种都没有效果,实际原因是因为配置的OpenSessionInView将FlushMode默认设置为了MANUAL!只要手动将设置为AUTO就OK了,这种方法最好理解;其次有一种方法是配置事务边界,个人觉得不容易配置,很容易漏配,所以将FlushMode设置为了AUTO可以一劳永逸!
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