[FOP-1456] NullPointerException throw if there is no fo:root

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 0.94
• Component/s: fo/unqualified
• Environment: Operating System: All; Platform: All
• External issue ID: 43910
• Assignee: fop-dev
• Reporter: David Delbecq
• Created: 19/Nov/07 23:48
• Updated: 20/Nov/07 01:47
• Resolved: 01/Apr/12 06:27

Description

in AreaTreeHandler, if no fo:root was found in document (which can arise from
time to time when you use fo together with xslt), the endDocument() method
throws a nullpointerexception instead of making clean fallback (either generate
empty document or throw a SAXException). Because NullPointerException is quite
anonymous error, it makes it difficult for caller to properly catch it and
handle it in calling code.

Please note javadoc of endDocument states that it "throws SAXException if there
is some error". So this probably should be throwing a SAXException("no fo:root
found in document")

Caused by: java.lang.NullPointerException
at org.apache.fop.area.AreaTreeHandler.endDocument(AreaTreeHandler.java:264)
at org.apache.fop.fo.FOTreeBuilder.endDocument(FOTreeBuilder.java:171)
at net.sf.saxon.event.ContentHandlerProxy.close(ContentHandlerProxy.java:255)
at net.sf.saxon.event.ImplicitResultChecker.close(ImplicitResultChecker.java:69)
at net.sf.saxon.event.ProxyReceiver.close(ProxyReceiver.java:86)
at
net.sf.saxon.event.ComplexContentOutputter.close(ComplexContentOutputter.java:458)
at net.sf.saxon.Controller.transformDocument(Controller.java:1655)
at net.sf.saxon.Controller.transform(Controller.java:1438)