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https://issues.apache.org/jira/browse/FOP-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Orolin updated FOP-2237:
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    Attachment: patch.diff

Attachment patch.diff has been added
                
> [PATCH]Zoom in "preview screen" should cause NullPointerException
> -----------------------------------------------------------------
>
>                 Key: FOP-2237
>                 URL: https://issues.apache.org/jira/browse/FOP-2237
>             Project: Fop
>          Issue Type: Bug
>          Components: awt renderer
>    Affects Versions: trunk
>         Environment: Operating System: Windows
> Platform: PC
>            Reporter: Peter Orolin
>              Labels: patch
>         Attachments: patch.diff
>
>   Original Estimate: 3h
>  Remaining Estimate: 3h
>
> Zoom in "preview screen" should cause NullPointerException, because of 
> incorrect use of synchronized in  class 
> org.apache.fop.render.awt.viewer.PreviewPanel. 
> Method PreviewPanel.reload() is synchronized, but it creates new Thread, 
> which is not under synchronized control. Sometimes, when it is later run 
> method PreviewPanel.showPage(), it finishes with NullPointerException (array 
> pagePanels is initialized, but objects in the array not -- see 
> ShowPageImage.run statement pagePanels[pg - firstPage].setPage(pg);)

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