[jira] [Updated] (FOP-2237) [PATCH]Clicking zoom-in or zoom-out buttons in preview screen should cause NullPointerException

["Peter Orolin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FOP-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Peter Orolin updated FOP-2237:
------------------------------

    Summary: [PATCH]Clicking zoom-in or zoom-out buttons in preview screen should cause NullPointerException  (was: [PATCH]Zoom in "preview screen" should cause NullPointerException)
    
> [PATCH]Clicking zoom-in or zoom-out buttons 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 PreviewPanel.ShowPageImage.run statement pagePanels[pg - firstPage].setPage(pg);)

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