[jboss-user] [JBoss Seam] - UnsupportedOperationException when using h:selectManyListbox

[wise_guybg]

Hi,

I receive an UnsupportedOperationException when I try to call entityManager.merge(exam)

Here is a part of the stack trace:
anonymous wrote : java.util.AbstractList.clear(AbstractList.java:217)
  | org.hibernate.type.CollectionType.replaceElements(CollectionType.java:445)
  | org.hibernate.type.CollectionType.replace(CollectionType.java:524)
  | org.hibernate.type.TypeFactory.replace(TypeFactory.java:482)
  | org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:340)
  | org.hibernate.event.def.DefaultMergeEventListener.entityIsPersistent(DefaultMergeEventListener.java:153)
  | org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:126)
  | 

And a part of the JSF code:
<h:selectManyListbox id="providerList" value="#{exam.providerList}" styleClass="field" required="true">
  |         <s:selectItems value="#{providers}" var="p" label="#{p.name}"/>
  |         <s:convertEntity />
  | </h:selectManyListbox>

Where "providers" is received from a @Factory method and exam.providerList is used with a getter/setter for the property
List<Provider> providerList
of the Exam entity.

I found that setProviderList() is called with an argument of type Arrays$ArrayList which is immutable and does not override AbstractList.remove(). This is the reason for the exception to occur.

I wanted to ask if some has seen the same problem and knows the solution. Maybe there is something else that I'm not doing right.

I have also found a workaround which I consider very ugly. What I did was to make a modification to setProviderList() so that it recognizes Arrays$ArrayList and create a new ArrayList from it.

Any comments? Thanks in advance...

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