org.jboss.seam.ui.entityConverter not working with set of en

[chandu_great]

Hi,
The entity converter is not working with a set of entities.

I think, the entity converter(org.jboss.seam.ui.entityConverter) doesn't hanlde Set of entities. Its handles only Lists or Collection of entities.

In components.xml, I had an entity query(shown below) which was generating a lot of queries.
<framework:entity-query scope="EVENT" name="users" ejbql="select u from User u" order="username" />

In User class(User.java) I had a collection of entities defined as
protected List roles = new ArrayList();
I changed the semantics from bag/collection to set, that is,
protected Set roles = new HashSet();

In order to reduce a number of queries, I tried to use 'left join fetch' query (shown below) which is not working in case of list or collection of entities. But it is working in case of set of entities(:-).
<framework:entity-query scope="EVENT" name="usersAdmin" ejbql="SELECT DISTINCT object(u) from User u left join fetch u.groups left join fetch u.roles" order="username" />


Now When I tried to save a record, I am getting conversion error :-(.
I checked the entity converter sources. I think the entity converter has no problem working out the value type. In the case of a collection the entity converter must check the type of an item in the value object, rather than the value object itself. I guess that it has code to do this in the case of a list but not a set.

Am I thinking right? Any guidance on this issue will be very helpful if someone can throw light on this. Is there any workaround to get rid of this entity conversion problem in case of a set of entities?
I am a newbie.

Thanks.
Chandra

[pmuir]

Post your xhtml

[chandu_great]

Hi,

The relevant xhtml fragment is shown below.

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:s="http://jboss.com/products/seam/taglib"
xmlns:c="http://java.sun.com/jstl/core"
xmlns:v="http://myTest.com/core"
xmlns:a="https://ajax4jsf.dev.java.net/ajax">

<s:div rendered="#{empty rendered or rendered}">
<s:validateAll>
<c:choose>
.....
.....
<c:when test="#{listStyle eq 'entityCheck'}">
<h:selectManyCheckbox value="#{value}"
converter="org.jboss.seam.ui.EntityConverter"
layout="pageDirection">
<f:selectItems value="#{v:toSelectItems(pickList)}" />
<f:attribute name="valueChangeListener"
value="#{valueChangeListenerMethod}"
rendered="#{not empty valueChangeListenerMethod}" />
</h:selectManyCheckbox>
</c:when>
.....
.....
</c:choose>
</s:validateAll>
</s:div>
</ui:composition>

The problem occurs when I try to save a user record. A user can be assigned multiple roles( listStyle eq 'entityCheck' as shown in xhtml above).
The User class looks like:
public class User implements Serializable{

protected String username; // assigned primary key

//@IndexColumn(base=1,name="roles")
//protected List roles = new ArrayList();
protected Set roles = new HashSet();

@Id
@Column(unique = true)
@Length(min = 5, max = 40)
public String getUsername() {
return username;
}

public String getPassword() {
return password;
}

@ManyToMany
public Set getRoles() {
return roles;
}

public void addRole(Role role) {
getRoles().add(role);
role.addUser(this);
}

public void setUsername(String username) {
this.username = username;
}

public void setRoles(Set roles) {
this.roles = roles;
}

public void setGroups(Set groups) {
this.groups = groups;
}
}

Thanks,
Chandra

[pmuir]

JSF only supports the use of Lists and arrays as backing objects for h:selectManyXXX - check the javadoc / tlddoc