I wrote a simple query in ListView page,there is a select component in
the page bottom,which will load category list from DB by Hibernate.
the ListView.tml will provider query parameter(selectCat) to the ListView class.
when i running them,i got this exception:
2009-09-23 17:45:41 http-8080-2 DEBUG scrip.ListView:[161]:getSelectCat...
2009-09-23 17:45:41 http-8080-2 DEBUG scrip.ListView:[151]:getCatEncoder...
2009-09-23 17:45:41 http-8080-2 ERROR
hibernate.LazyInitializationException:[19]:could not initialize proxy
- no Session
org.hibernate.LazyInitializationException: could not initialize proxy
- no Session
at
org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:57)
at
org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
at
org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:150)
at
com.packtpub.t5first.entities.Category$$EnhancerByCGLIB$$13d50a18.getId(<generated>)
at
com.packtpub.t5first.utils.CategoryEncoder.toClient(CategoryEncoder.java:20)
at
com.packtpub.t5first.utils.CategoryEncoder.toClient(CategoryEncoder.java:1)
at
org.apache.tapestry5.corelib.components.Select.options(Select.java:224)
Here is my code:
---my ListView page class---
public class ListView{
...
@InjectService("catService")
private CategoryService catService;
public SelectModel getCatSelectModel(){
log.debug("getCatSelectModel...");
return new CategorySelectModel(catService.list());
}
public ValueEncoder<Category> getCatEncoder(){
log.debug("getCatEncoder...");
return new CategoryEncoder(catService);
}
@Persist
private Category selectCat;
@Inject
private CategoryDAO catDao;
public Category getSelectCat() {
log.debug("getSelectCat...");
return selectCat;
}
public void setSelectCat(Category selectCat) {
log.debug("setSelectCat...");
this.selectCat = selectCat;
}
...
}
---my CategoryEncoder class---
public class CategoryEncoder implements ValueEncoder<Category>{
private CategoryService catService;
public CategoryEncoder(CategoryService catService) {
super();
this.catService = catService;
}
@Override
public String toClient(Category cat) {
return String.valueOf(cat.getId());
}
@Override
public Category toValue(String id) {
return catService.getFromId(Integer.parseInt(id));
}
}
---ListView.tml---
<html t:type="layout"
title="${message:page-scrip-listview}"
xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
<t:form t:id="scripListQueryForm">
<div id="dataListScope">
<t:grid
t:id="scripGrid"
t:source="listDS"
t:empty="There are currently no search results"
model="beanModel"
rowsPerPage="5"
row="current"
exclude="content"
reorder="rownumber,id,title,releaseDate"
pagerPosition="bottom"
style="width:620px;">
</t:grid>
</div>
<div id="operationScope">
<p>
<t:label for="queryCat"/>
<t:select t:id="queryCat"
t:model="catSelectModel"
t:value="selectCat"
t:encoder="catEncoder"/>
<t:Submit t:id="submitQueryButton"/>
</p>
</div>
</t:form>
</html>
who can give me some suggestion? Any help is welcome! :)
--
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