Martin Grigorov created WICKET-5375:
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             Summary: Improve ConcatBundleResource error handling when a 
resource is missing
                 Key: WICKET-5375
                 URL: https://issues.apache.org/jira/browse/WICKET-5375
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 6.11.0
            Reporter: Martin Grigorov
            Assignee: Martin Grigorov


If a resource bundle cannot find any of its items them it fails with:

Caused by: java.lang.NullPointerException
        at 
org.apache.wicket.resource.bundles.ConcatBundleResource.readAllResources(ConcatBundleResource.java:172)
        at 
org.apache.wicket.resource.bundles.ConcatBundleResource.getCacheableResourceStream(ConcatBundleResource.java:229)
        at 
org.apache.wicket.request.resource.caching.version.LastModifiedResourceVersion.getVersion(LastModifiedResourceVersion.java:41)
        at 
org.apache.wicket.request.resource.caching.version.RequestCycleCachedResourceVersion.getVersion(RequestCycleCachedResourceVersion.java:97)
        at 
org.apache.wicket.request.resource.caching.FilenameWithVersionResourceCachingStrategy.decorateUrl(FilenameWithVersionResourceCachingStrategy.java:102)
        at 
org.apache.wicket.core.request.mapper.BasicResourceReferenceMapper.mapHandler(BasicResourceReferenceMapper.java:238)
        at 
org.apache.wicket.request.mapper.ParentPathReferenceRewriter.mapHandler(ParentPathReferenceRewriter.java:91)
        at 
org.apache.wicket.request.mapper.CompoundRequestMapper.mapHandler(CompoundRequestMapper.java:215)
        at 
org.apache.wicket.request.cycle.RequestCycle.mapUrlFor(RequestCycle.java:433)


Both 
org.apache.wicket.resource.bundles.ConcatBundleResource#collectResourceStreams 
and org.apache.wicket.resource.bundles.ConcatBundleResource#getCacheKey return 
null if any of the resources' streams cannot be loaded.

It would be nice if Wicket logs an error explaining which resource is missing.

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