Unhelpful exception messages when a null value is bound to a required parameter.
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Key: TAPESTRY-2476
URL: https://issues.apache.org/jira/browse/TAPESTRY-2476
Project: Tapestry
Issue Type: Bug
Components: Core Components
Affects Versions: 5.0.11
Environment: Windows XP Service Pack 2, FireFox 2.0.0.14, Eclipse
3.3.2, Maven 2.0.9, Run-Jetty-Run, Java 1.6.0_3
Reporter: Daniel
Priority: Minor
Example exception:
Render queue error in SetupRender[MainPage:tilesetsearch.palette]:
org.apache.tapestry.ioc.internal.util.TapestryException
Example tml line:
<t:palette t:model="keywordModel" t:selected="selectedKeywordIds"
t:encoder="longEncoder" t:size="5"/>
Example stack trace: java.lang.NullPointerException
* org.apache.tapestry.corelib.components...
Palette.setupRender(Palette.java:379)
* Palette.setupRender(Palette.java)
* org.apache.tapestry.internal.structure...
ComponentPageElementImpl$13$1.run(ComponentPageElementImpl.java:478)
* ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:880)
* ComponentPageElementImpl.access$100(ComponentPageElementImpl.java:54)
* ComponentPageElementImpl$13.render(ComponentPageElementImpl.java:482)
* org.apache.tapestry.internal.services...
RenderQueueImpl.run(RenderQueueImpl.java:63)
* PageRenderQueueImpl.render(PageRenderQueueImpl.java:84)
This constitutes one example where the t:selected parameter was null. Later I
got the same exception message with a different stack trace when the same
parameter was null, but for a different reason.
Perhaps required parameters should not only be bound, but also null checked.
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