Question

I’m having a problem with my Seam code and I can’t seem to figure out what I’m doing wrong. It’s doing my head in 🙂 Here’s an excerpt of the stack trace:

Caused by: java.lang.IllegalArgumentException: Can not set java.lang.Long field com.oobjects.sso.manager.home.PresenceHome.customerId to java.lang.String 

I’m trying to get a parameter set on my URL passed into one of my beans. To do this, I’ve got the following set up in my pages.xml:

<page view-id='/customer/presences.xhtml'>   <begin-conversation flush-mode='MANUAL' join='true' />   <param name='customerId' value='#{presenceHome.customerId}' />   <raise-event type='PresenceHome.init' />   <navigation>     <rule if-outcome='persisted'>       <end-conversation />       <redirect view-id='/customer/presences.xhtml' />     </rule>   </navigation> </page> 

My bean starts like this:

@Name('presenceHome') @Scope(ScopeType.CONVERSATION) public class PresenceHome extends EntityHome<Presence> implements Serializable {   @In   private CustomerDao customerDao;    @In(required = false)   private Long presenceId;    @In(required = false)   private Long customerId;    private Customer customer;    // Getters, setters and other methods follow. They return the correct types defined above } 

Finally the link I use to link one one page to the next looks like this:

<s:link styleClass='#{selected == 'presences' ? 'selected' : ''}'     view='/customer/presences.xhtml' title='Presences' propagation='none'>     <f:param name='customerId' value='#{customerId}' />     Presences </s:link> 

All this seems to work fine. When I hover over the link above in my page, I get a URL ending in something like ‘?customerId=123’. So the parameter is being passed over and it’s something that can be easily converted into a Long type. But for some reason, it’s not. I’ve done similar things to this before in other projects and it’s worked then. I just can’t see what it isn’t working now.

If I remove the element from my page declaration, I get through to the page fine.

So, does anyone have any thoughts?

Answer 1

You want to add a converter to your pages.xml file. Like this:

<param name='customerId'        value='#{presenceHome.customerId}'  converterId='javax.faces.Long' /> 

See the seampay example provided with seam for more details.