[Yanel-dev] Navigation Resource

[basZero]

Hi Michi,

we just had a little incident where for a certain unknown reason the header
section of the page (Navigation) could not be rendered.

In the log, I see this Nullpointer:
65195001 2011-06-30 09:27:28,215 [http-80-103] ERROR
org.wyona.yanel.impl.resources.navigation.NavigationResource.getView():220
 - java.lang.NullPointerException (/de/header.yanel, Name: Zwischengas, ID:
zwischengas, Mount-Point: /, No reverse proxy set)
java.lang.NullPointerException
at
org.wyona.yanel.impl.resources.navigation.NavigationResource.getOS(NavigationResource.java:374)
at
org.wyona.yanel.impl.resources.navigation.NavigationResource.getView(NavigationResource.java:173)
at
org.wyona.yanel.impl.resources.navigation.NavigationResource.getView(NavigationResource.java:98)
at
org.wyona.yanel.core.source.ResourceResolver.resolve(ResourceResolver.java:75)
at
org.wyona.yanel.core.source.SourceResolver.resolve(SourceResolver.java:67)
at
org.wyona.yanel.core.transformation.XIncludeTransformer.startElement(XIncludeTransformer.java:67)
at
org.apache.xml.serializer.ToXMLSAXHandler.closeStartTag(ToXMLSAXHandler.java:204)
at
org.apache.xml.serializer.ToSAXHandler.flushPending(ToSAXHandler.java:277)
at
org.apache.xml.serializer.ToXMLSAXHandler.endElement(ToXMLSAXHandler.java:243)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1399)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2411)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1374)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2411)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1374)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2411)
at org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:392)


My opinion is: there can't be a Nullpointer Exception at that location when
the getOS() method is called from the getView() method, because getView()
makes sure that no null is passed into getOS().

How do you explain this? Any idea?

However, the system gets halted due to this error for some seconds (in the
case today for 10 seconds), recovers and continues to work fine.

Cheers
Balz
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