Configuration and function of opensessioninviewfilter

Spring solves the issue of closing and enabling hibernate sessions for us.
Hibernate allows delayed loading of associated objects and attributes, but must ensure that the delayed loading operation is limited to the same hibernate session. If the service layer returns a domain object with the delayed Loading Function enabled to the web layer, when the web layer accesses the data that requires delayed loading, the hibernate session for the domain object loading has been disabled, these causes access exceptions for delayed data loading.

(Eg: org. hibernate. lazyinitializationexception :( lazyinitializationexception. Java: 42)
-Failed to lazily initialize a collection of Role: CN. easyjava. Bean. Product. producttype. childtypes, no session or session was closed
Org. hibernate. lazyinitializationexception: failed to lazily initialize a collection of Role: CN. easyjava. Bean. Product. producttype. childtypes, no session or session was closed ).

It is used to bind a hibernate session to the thread corresponding to a complete request process. The purpose is to implement the "open session in view" mode. For example, it allows delayed loading of the desired objects after the transaction is committed.

The opensessioninviewfilter provided by spring solves this problem well. The main function of opensessioninviewfilter is to bind a hibernate session to the thread corresponding to a complete request process. The purpose is to implement the "open session in view" mode. For example, it allows delayed loading of the desired objects after the transaction is committed.
The opensessioninviewfilter filters bind the hibernate session to the request thread, which is automatically detected by the spring Transaction Manager. Therefore, opensessioninviewfilter is applicable to the service layer's transaction management environment using hibernatetransactionmanager or jtatransactionmanager. It can also be used in non-transaction read-only data operations.

<Filter>
<Filter-Name> spring opensessioninviewfilter </filter-Name>
<Filter-class> org. springframework. Orm. hibernate3.support. opensessioninviewfilter </filter-class>
<Init-param>

<! --
Specify the name of org. springframework. Orm. hibernate3.localsessionfactorybean in the spring configuration file. The default value is sessionfactory.
If the name of localsessionfactorybean in spring is not sessionfactory, you must specify this parameter. Otherwise, the exception of sessionfactory cannot be found.
-->
<Param-Name> sessionfactorybean </param-Name>
<Param-value> sessionfactory </param-value>
</Init-param>
</Filter>
<Filter-mapping>
<Filter-Name> spring opensessioninviewfilter </filter-Name>
<URL-pattern>/* </url-pattern>
</Filter-mapping>