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https://issues.apache.org/jira/browse/WICKET-4718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437769#comment-13437769
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Carsten Dräger edited comment on WICKET-4718 at 8/20/12 9:08 PM:
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Ok, here's the stack trace when I try to cache the IResourceStream returned by
getResourceStream() in my extended ResourceStreamResource. I get that multiple
times as well: http://pastebin.com/5tgWDZYc
Also, I tried to debug it. Without caching, if I click on a ResourceLink e.g.
to display an image from the database in a JQuery FancyBox, the stream get
instantiated in the CouchDbAttachmentResource#getResourceStream(). It then
appears to get instantiated again in the
ResourceStreamResource#internalGetResourceStream()! I can't see why this should
be happening.
Also, by the time the resource should be displayed, the stream is already
closed for some reason, so this is happening all over again, which is probably
why I get 2x2=4 queries for one click on a ResourceLink.
If I try your workaround, it's sometimes working, sometimes not depending on
the way I use the resource. I still get multiple queries, but for the image
explained above, it's only happening two times.
However, when I let the browser e.g. play a .wav file directly from the
database, it's not working anymore and I get the following exceptions:
http://pastebin.com/JZF1kF9i
So not really an option either :/
was (Author: blacklight):
Ok, here's the stack trace when I try to cache the IResourceStream returned
by getResourceStream() in my extended ResourceStreamResource. I get that
multiple times as well: http://pastebin.com/tNQ5hfAC
Also, I tried to debug it. Without caching, if I click on a ResourceLink e.g.
to display an image from the database in a JQuery FancyBox, the stream get
instantiated in the CouchDbAttachmentResource#getResourceStream(). It then
appears to get instantiated again in the
ResourceStreamResource#internalGetResourceStream()! I can't see why this should
be happening.
Also, by the time the resource should be displayed, the stream is already
closed for some reason, so this is happening all over again, which is probably
why I get 2x2=4 queries for one click on a ResourceLink.
If I try your workaround, it's sometimes working, sometimes not depending on
the way I use the resource. I still get multiple queries, but for the image
explained above, it's only happening two times.
However, when I let the browser e.g. play a .wav file directly from the
database, it's not working anymore and I get the following exceptions:
http://pastebin.com/TDRg9KzD
So not really an option either :/
> ResourceStreamResource#getResourceStream() is called multiple times
> -------------------------------------------------------------------
>
> Key: WICKET-4718
> URL: https://issues.apache.org/jira/browse/WICKET-4718
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 6.0.0-beta3
> Environment: Mac OS X 10.7.4 Lion, Java 6, IntelliJ Idea 11.1, Tomcat
> 7 & Jetty 7.5.0
> Reporter: Carsten Dräger
>
> When a ResourceStreamResource is implemented to return a IResourceStream
> dynamically, by returning a new instance of an extended
> AbstractResourceStream, that ResourceStream is instantiated multiple times
> when a ResourceLink is clicked.
> In my case, that ResourceStream returns an AttachmentInputStream from the
> Ektorp library (for CouchDB interaction). This behavior results in multiple
> queries (currently up to four) when I click once on a ResourceLink to that
> resource.
> Code Examples
> Extended ResourceStreamResource: http://pastebin.com/9BB7LEiV
> Extended IResouceStream: http://pastebin.com/Z7GvzGja
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