Loop parameter becoming null

Tyler Wilcock <[email protected]> Mon, 22 Jan 2018 15:49:37 -0600
Newsgroups	gmane.comp.java.tapestry.user
Message-ID	<CAOZwnFbY5fj0Xk+hK9KRGH-xpF9p6eZ5qj9AWh+-7E11XN0D4w@mail.gmail.com>
Hi all.  I have some components being rendered in a loop.  On initial
render, everything comes out fine.  However, when I try to click on an
eventlink within one of the rendered components, I get an application
exception.  What is going wrong here?

---
SearchFilterContainer.java
---

public class SearchFilterContainer
{
   @Inject
   private SearchFilterService searchFilterService;

   @Property
   private SearchFilter currentFilter;

   public List<SearchFilter> getChronologicalSearchFilters()
   {
      return searchFilterService.getChronologicalFilters();
   }

   public String getPreFiltersText()
   {
      return messages.get("pre-search-filters-text");
   }

   public boolean isAssetStatusFilter()
   {
      return currentFilter.getFilterType() == SearchFilterType.ASSET_STATUS;
   }


---
SearchFilterContainer.tml
---

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<t:container xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd"
             xmlns:p="tapestry:parameter"
             xmlns:sf="tapestry-library:dam/search/filters">

<t:loop source="chronologicalSearchFilters" value="currentFilter"
formState="ITERATION">
    <t:if test="assetStatusFilter">
        <sf:refineassetstatusfilter
assetStatusRefineOption="currentFilter.getFilterValue()" />
    </t:if>
</t:loop>

</t:container>

---
RefineAssetStatusFilter.java
---

public class RefineAssetStatusFilter extends SearchComponent
{
   @Parameter(required=true)
   private AssetStatusRefineOptions assetStatusRefineOption;

   public String getFilterText()
   {
      return assetStatusRefineOption.getDisplayName();
   }

   public void onRemove()
   {
      // do stuff
   }
}

---
RefineAssetStatusFilter.tml
---

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<t:container xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd">

<div class="search-filter rectangular-pill">
    ${getFilterText()}
    <t:eventlink event="remove" class="remove-filter-icon">&times;</t:eventlink>
</div>

</t:container>

---
Exception information
---
An unexpected application exception has occurred.

   - org.apache.tapestry5.ioc.internal.OperationException
   Failure reading parameter 'assetStatusRefineOption' of component
   dam/SearchResults:instantsearch.searchfiltercontainer.refineassetstatusfilter:
   Property 'currentFilter' (within property expression
   'currentFilter.getFilterValue()', of
   collective.app.dam.components.search.filters.SearchFilterContainer@48e53372)
   is null.
   locationclasspath:collective/app/dam/components/search/filters/SearchFilterContainer.tml,
   line 8
   3 xmlns:p="tapestry:parameter"
   4 xmlns:sf="tapestry-library:dam/search/filters">
   5
   6 <t:loop source="chronologicalSearchFilters" value="currentFilter"
   formState="ITERATION">
   7 <t:if test="assetStatusFilter">
   8 <sf:refineassetstatusfilter
   assetStatusRefineOption="currentFilter.getFilterValue()" />
   9 </t:if>
   10

   trace
      - Triggering event 'remove' on
      dam/SearchResults:instantsearch.searchfiltercontainer.refineassetstatusfilter
   - org.apache.tapestry5.runtime.ComponentEventException
   Failure reading parameter 'assetStatusRefineOption' of component
   dam/SearchResults:instantsearch.searchfiltercontainer.refineassetstatusfilter:
   Property 'currentFilter' (within property expression
   'currentFilter.getFilterValue()', of
   collective.app.dam.components.search.filters.SearchFilterContainer@48e53372)
   is null.
   contexteventTyperemovelocationclasspath:collective/app/dam/components/search/filters/SearchFilterContainer.tml,
   line 8
   - org.apache.tapestry5.ioc.internal.util.TapestryException
   Failure reading parameter 'assetStatusRefineOption' of component
   dam/SearchResults:instantsearch.searchfiltercontainer.refineassetstatusfilter:
   Property 'currentFilter' (within property expression
   'currentFilter.getFilterValue()', of
   collective.app.dam.components.search.filters.SearchFilterContainer@48e53372)
   is null.
   locationclasspath:collective/app/dam/components/search/filters/SearchFilterContainer.tml,
   line 8
   - java.lang.NullPointerException
   Property 'currentFilter' (within property expression
   'currentFilter.getFilterValue()', of
   collective.app.dam.components.search.filters.SearchFilterContainer@48e53372)
   is null.