Render queue error in BeforeRenderTemplate when using a SelectModel

Hi,

Coming from the WebObject world here. I’m trying to build a select input, but it’s not working. The error:

ERROR [2017-07-25 18:28:22,181] bootique-http-33 o.a.t.m.T.RequestExceptionHandler: Processing of request failed with uncaught exception: org.apache.tapestry5.ioc.internal.OperationException: Render queue error in BeforeRenderTemplate[PagePrincipale:gabarit]: org.apache.tapestry5.ioc.internal.util.TapestryException [at classpath:com/druide/tests/pages/PagePrincipale.tml, line 60]
java.lang.NullPointerException: null
	at org.apache.tapestry5.internal.util.SelectModelRenderer.option(SelectModelRenderer.java:52)
	at org.apache.tapestry5.util.AbstractSelectModel.visitOptions(AbstractSelectModel.java:54)
	at org.apache.tapestry5.util.AbstractSelectModel.visit(AbstractSelectModel.java:46)
	at org.apache.tapestry5.corelib.components.Select.options(Select.java:462)
Wrapped by: org.apache.tapestry5.ioc.internal.util.TapestryException: null
Wrapped by: org.apache.tapestry5.ioc.internal.OperationException: Render queue error in BeforeRenderTemplate[PagePrincipale:gabarit]: org.apache.tapestry5.ioc.internal.util.TapestryException

The call:

  @Property
  private SelectModel selectionMV;
  
  @Inject
  SelectModelFactory selectModelFactory;

  @Property
  private MachineVirtuelle selectionMachineVirtuelle;

  @Property
  private MachineVirtuelleEncoder encoder;

  void setupRender() {
    List<MachineVirtuelle> gabarits = getGabarits();
    selectionMV = selectModelFactory.create(gabarits, "nom");
  }

	<t:form>
		<t:select t:id="gabarit" value="selectionMachineVirtuelle"
			model="selectionMV" encoder="encoder" />
	</t:form>

I get the exception from the call to selectModelFactory.create, and the « gabarits » list is not empty. « nom » is an attribute of MachineVirtuelle.



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