[jboss-user] [JBoss Seam] - h:SelectManyListbox, s:SelectItems and Many-to-Many mapping

[ovistanciu]

Hello.
Not sure if I'm addressing a known bug, but here it goes.

I'm using Seam 2.0.0.GA, JBoss AS 4.2.2, JDK 1.5

I have a Many-to-Many mapping:
Location entity:

  | private Collection<UserGroup> userGroups;
  | 
  | @ManyToMany(TargetEntity=ro.ebsoft.doorcontrol.applogic.entity.UserGroup.class,
  | cascade={CascadeType.MERGE, CascadeType.PERSIST})
  | @JoinTable(name="UserGroup_Location",
  | joinColumns={@JoinColumn(name="locationId")}, inverseJoinColumns={@JoinColumn(name="userGroupId")})
  | public Collection<UserGroup> getUserGroups() {	
  | 	return userGroups;
  | }
  | 
  | public void setUserGroups(Collection<UserGroup> userGroups) {
  | 	this.userGroups = userGroups;
  | }
  | 

and UserGroup entity

  | private Collection<Location> locations = null;
  | 
  |  @ManyToMany(
  |     		cascade={CascadeType.PERSIST, CascadeType.MERGE},
  |     		mappedBy="userGroups",
  |     		targetEntity=Location.class
  |     )
  | 	public Collection<Location> getLocations() {
  | 		return locations;
  | 	}
  | 
  | 	public void setLocations(Collection<Location> locations) {
  | 		this.locations = locations;
  | 	}
  | 
  | 

When adding a new UserGroup, a user can select any number of locations for the group.

userGroup.xhtml :

  | <h:selectManyListbox id="locationsListBox" value="#{userGroupHome.instance.locations}" 
  |             		disabled="#{not s:hasRole('admin')}">
  |       <s:convertEntity/>
  |       <s:selectItems value="#{locationList.resultList}" var="location" label="#{location.locationName}"/>
  | </h:selectManyListbox>
  | 

When I try to save a new group (for instance, with the 2 top locations from the listbox), there's a failed validation. Faces Message: Conversion Error setting value '0 1' for '#{userGroupHome.instance.locations}'.

I understand there's a problem binding a Set to a h:selectManyListBox (should use ArrayList). When trying to change Collection<Location> locations;  to ArrayList<Location> locations;  Hibernate notifies that it does not support it (mapping many to many to something else than a Collection). 

What to do? Does anyone have a fix for this problem?

Thank you for your time.


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