m:n relations? ("Property not found on type org.hibernate.collection.PersistentSet")

acgrama Feb 17, 2011 9:47 AM

Hello all,

I have a bit of trouble showing data retrieved through m:n relations. In particular, I am using a richDataTable to show "problems" and their "solutions". In the database, I have a "problem" and a "solution" table, as well as a "problem2solution" table which associates solutions to a problem.

My code (snipped to the relevant parts):
<rich:dataTable value="#{ManageProblems.problems}" var="problem">
    <rich:column>
     <h:outputText value="#{problem.problem2solution.description}"/> -- this line leads to the error "Property 'description' not found on type org.hibernate.collection.PersistentSet"
    </rich:column>
...
</rich:dataTable>

Is this possible in Seam? If yes, how could this be modelled?

Thank you!
--Cristina.

1. Re: m:n relations? ("Property not found on type org.hibernate.collection.PersistentSet")

antibrumm.mfrey0.bluewin.ch Feb 17, 2011 10:07 AM (in response to acgrama)
If i understand you correctly you have two entites:
- Problem
- Solution

Both with a bi-directional reference?
- problem.solutions
- solution.problems

I would use a datalist inside a cell in this case:

<rich:dataTable value="#{ManageProblems.problems}" var="problem"> <rich:column> <rich:dataList value="#{problem.getSolutionsAsList()}" var="solution"> <h:outputText value="#{solution.description}" /> </rich:dataList> </rich:column> </rich:dataTable>
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2. Re: m:n relations? ("Property not found on type org.hibernate.collection.PersistentSet")

acgrama Feb 17, 2011 10:09 AM (in response to acgrama)

You understood correctly! Thank you for the suggestion, I'll try it out!
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3. Re: m:n relations? ("Property not found on type org.hibernate.collection.PersistentSet")

serkan.s.eskici.online.nl Feb 17, 2011 1:50 PM (in response to acgrama)

You usually get this error if you try to iterate through a Set inside a datatable or ui:repeat. Change your set into a list or array or use c:forEach which has support for sets.
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