Problem: listbox, livedata,spring-hibernate

asked 2007-04-04 10:34:23 +0800

admin
18691 ● 1 ● 10 ● 130

Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=4243025

By: grzegorzk__

Assume we have two domain classes: Resource and CmsType and Resource contains reference to CmsType:

---
Resource res = new Resource();
CmsType type = new CmsType();
res.setCmsType(type);
---

res.cmsType is 'lazy' so we need open session to read it.


In zul page there's a listbox that displays list of available resources and CmsType's name of resources (with livedata).

But when: res.getCmsType().getName() [in renderer] it throws exception
'org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed' -

So what could I do to prevent session from closing? (in this case 'org.springframework.orm.hibernate3.support.OpenSessionInViewFilter' doesn't
work)

One of solutions is to read resource again from Database in renderer but it will reduce performance.


----------------
--- list.zul ---

<?xml version="1.0" encoding="UTF-8"?>

<zk
xmlns="http://www.zkoss.org/2005/zul"
xmlns:h="http://www.w3.org/1999/xhtml"
xmlns:zk="http://www.zkoss.org/2005/zk"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.zkoss.org/2005/zul
http://www.zkoss.org/2005/zul/zul.xsd">

<zscript>
<![CDATA[
import com.edirect.pl.app.cms.zk.livedata.CmsLiveData;

model = CmsLiveData.getTestListModel();
renderer = CmsLiveData.getTestListItemRenderer();
]]>
</zscript>

<listbox model="${model}" itemRenderer="${renderer}"/>

</zk>


------------------------
--- CmsLiveData.java ---

package com.edirect.pl.app.cms.zk.livedata;

class CmsLiveData
{
@SuppressWarnings( "unchecked" )
public static ListModelList getTestListModel()
{
ICMS cmsFacade = (ICMS)SpringUtil.getBean("cms");
List list =
cmsFacade.getResourceManager().getResources(CmsUtil.getWebsiteId());
return new ListModelList(list);
}


public static ListitemRenderer getTestListItemRenderer()
{
return new ListitemRenderer()
{
public void render( Listitem item, Object data ) throws Exception
{
Resource res = (Resource)data;
item.setAttribute("item",res,Component.COMPONENT_SCOPE);

Listcell cell = new Listcell(res.getName());
cell.setParent(item);

Listcell cell = new Listcell(res.getCmsType().getName());
cell.setParent(item);
}
};
}
}


---------------
--- web.xml ---

....
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilt
er</filter-class>
</filter>
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
....