using OpenSessionInViewFilter

[cosmin]

I am trying to use the OpenSessionInViewFilter , but I am not entirely confortable with the examples i've found online and I have not managed to get it to work yet .

I am using Tapestry for the presentation layer , and at times , i'm returning data objects from hibernate that have been lazily initialised . The Tapestry code will call some of the lazy values , and I'm getting session closed excecptions .

I have read about the OpenSessionInViewFilter on this forum , since it seems to be a common solution for my question ( allthogh everyone else uses Struts ) . From what I gathered it looks like i need to add the following to my web.xml :

<filter>
	  <filter-name>hibernateFilter</filter-name>
	  <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
	</filter>


	<filter-mapping>
	  <filter-name>hibernateFilter</filter-name>
	  <url-pattern>/app</url-pattern> 
	</filter-mapping>

Tried that but I am still getting exceptions ... Is there anything else I need to do to configure this filter properly ?

Thanks

[jmelzer]

I use

Hibernate.initialize(object);

when I load the objects for a specified site, e.g. I implement a special method for a user search when I know the dependend objects will be loaded. Otherwise it is not garanteed that the correct hibernate session will bound to this object. (Think about havy load.)

regards,
Juergen

[cosmin]

where do you have that code . I'm affraid i'm using Tapestry which uses ognl , which is something similar to the JSP EL language . most of my time i get objects like this and theese would cause problems .

I need something that doesn't require me writting code in the presentation layer if possible

is that possible ?

[jmelzer]

You have to write it there where the transaction is fired for getting the objects...
In our application we make the transaction binding everytime a Manager is called. After the query is running I call the Hibernate.initialize(object)

[Costin Leau]

You can try this one:

<!-- Hibernate OpenSession Filter -->
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate3.support.OpenSes sionInViewFilter
</filter-class>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>sessionFactoryBeanName</param-name>
<param-value>HBSessionFactory</param-value>
</init-param>
</filter>

Turn on logging and see that the HB session is opened at the beginning and at the end of the request. The internal details of the view (like OGNL) don't make a difference - we are using WebWork (which uses OGNL a lot) and Velocity and OSIV works just fine.

[cosmin]

thanks guys , open filter worked just great , it looks like i kept getting an error due to some bad code in my presentation layer ( this was a test app and i was beeing a bit lazy ) :

transactionManagedBean.getMyDAO().save(myObject);

had to change this to

transactionManagedBean.saveMyObject(myObject);

IT's odd however that i was getting no error before cocnfiguring the filter . . .

[cristis1]

Hello,

I'd like to use the OpenSessionInViewFilter with my SpringApp. I searched the forums/docs and did not find a clear documentation/wiki (in fact the majority of the posts were about problems encountered while trying to implement the filter ).

Do you have links to a post/documentation where this mechanism is well explained?

Thank you,
Cristian.

[digz6666]

I've got this issue and I've declared opensessioninviewfilter in my web.xml file as mentioned above. But the problem still exist.

Here's my web.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/config/my-servlet.xml</param-value>
	</context-param>
	<filter>
		<filter-name>encoding-filter</filter-name>
		<filter-class>org.eon.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
		<init-param>
        	<param-name>forceEncoding</param-name>
        	<param-value>true</param-value>
    	</init-param>
	</filter>
	<filter>
		<filter-name>springSecurityFilterChain</filter-name>
		<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
	</filter>
	<filter>
		<filter-name>openSessionInViewFilter</filter-name>
		<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
		<init-param>
			<param-name>singleSession</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>sessionFactoryBeanName</param-name>
			<param-value>sessionFactory</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encoding-filter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>springSecurityFilterChain</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>openSessionInViewFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<servlet>
		<servlet-name>myservlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value/>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>myservlet</servlet-name>
		<url-pattern>*.jspx</url-pattern>
	</servlet-mapping>
	<servlet>
		<servlet-name>Resource Servlet</servlet-name>
		<servlet-class>org.springframework.js.resource.ResourceServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>Resource Servlet</servlet-name>
		<url-pattern>/resources/*</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	<error-page>
		<error-code>404</error-code>
		<location>/WEB-INF/pages/error.jsp</location>
	</error-page>
	<error-page>
		<error-code>500</error-code>
		<location>/WEB-INF/pages/error.jsp</location>
	</error-page>
	<login-config>
		<auth-method>BASIC</auth-method>
	</login-config>
</web-app>

Am I doing something wrong?

[pelirr]

Hello, I have the same one problem, my web.xml is:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>

<!-- Parameters to load Spring configuration -->
<context-param>
<param-name>contextConfigLocation</param-name>
<!-- Se elimina la referencia a comun-web-context a la espera de que se incorpore la parte comun -->
<!-- param-value>classpath*:comun-web-context.xml,classpath*:sgeser-web-context.xml</param-value-->
<param-value>classpath*:sgma-web-context.xml</param-value>
</context-param>


<!-- Parameters to load Tiles configuration -->
<context-param>
<param-name>org.apache.tiles.impl.BasicTilesContainer.DEF INITIONS_CONFIG</param-name>
<param-value>/WEB-INF/sgma-tiles.xml,/org/apache/tiles/classpath-defs.xml</param-value>
</context-param>


<!-- Filtro para Autenticacion de Usuario -->
<!--
<filter>
<filter-name>ControlAcceso</filter-name>
<filter-class>es.aena.sgcomun.base.web.struts2.autenticaci on.NtlmHttpFilter</filter-class>
<init-param>
<param-name>jcifs.netbios.wins</param-name>
<param-value>10.72.101.1</param-value>
</init-param>
<init-param>
<param-name>jcifs.smb.client.domain</param-name>
<param-value>indra</param-value>
</init-param>
</filter>
-->

<!-- Filtro auxiliar para las peticiones POST -->
<!--
<filter>
<filter-name>ControlAccesoPost</filter-name>
<filter-class>es.aena.sgcomun.base.web.struts2.autenticaci on.NtlmHttpPostFilter</filter-class>
</filter>
-->

<!-- Filter to activate struts -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>

<!-- Filtro para todas las peticiones HTTP -->
<!--
<filter-mapping>
<filter-name>ControlAcceso</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
-->
<!-- Filtro para todas las peticiones HTTP (peticiones post)-->
<!--
<filter-mapping>
<filter-name>ControlAccesoPost</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
-->

<!-- Filter mappings -->
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- Filtro para el problema con el lazy -->
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.O penSessionInViewFilter</filter-class>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>sessionFactoryBeanName</param-name>
<param-value>HBSessionFactory</param-value>
</init-param>
</filter>

<!-- Listener for Struts 2 and Spring dependency injection -->
<listener>
<listener-class>org.springframework.web.context.ContextLoade rListener</listener-class>
</listener>


<!-- Listener configuration for Tiles 2, by default takes /WEB-INF/tiles.xml as config file -->
<listener>
<listener-class>org.apache.struts2.tiles.StrutsTilesListener </listener-class>
</listener>

<servlet>
<servlet-name>InitServlet</servlet-name>
<servlet-class>es.aena.sgma.init.servlet.InitServlet</servlet-class>
<load-on-startup>10</load-on-startup>
</servlet>

<welcome-file-list>
<welcome-file>/jsp/index.jsp</welcome-file>
</welcome-file-list>

</web-app>

Should I change another thing? I am using struts2, spring and tiles. Thanks very much, and regards

[zapp]

Originally Posted by Costin Leau

You can try this one:
...

The solution from Costin (see above) works fine, just add a filter-mapping:

<filter-mapping>
        <filter-name>hibernateFilter</filter-name>
        <url-pattern>/*</url-pattern>
</filter-mapping>