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

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.5
• Component/s: renderer/awt
• Labels: patch
• Environment: Operating System: Windows; Platform: PC
• Assignee: Unassigned
• Reporter: Peter Orolin
• Created: 16/Apr/13 08:48
• Updated: 17/Apr/13 07:46

Description

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)