DO NOT REPLY [Bug 50574] New: content overflow onto second ODD page causes NullPointerException

[bugzilla]

https://issues.apache.org/bugzilla/show_bug.cgi?id=50574

           Summary: content overflow onto second ODD page causes
                    NullPointerException
           Product: Fop
           Version: 1.0
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: major
          Priority: P2
         Component: page-master/layout
        AssignedTo: fop-dev@xmlgraphics.apache.org
        ReportedBy: lancekn...@hotmail.com


Created an attachment (id=26480)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=26480)
XSL-FO demonstrating the odd page content overflow

I have a scenario where I print mailing labels on the back of each piece of
paper (even pages).  When content is too much on page 1, it should overflow
onto page 3 (while mailing labels print on both page 2 and page 4).

ISSUE:
In FOP 1.0 when the content overflows page 1 to flow onto the next ODD page, a
java.lang.NullPointerException is thrown.  This functionality did work in FOP
0.95.

Attached a simple XSL-FO to demonstrate this.

Thanks.

lance

Here's the exception:
java.lang.NullPointerException
    at
org.apache.fop.layoutmgr.PageBreakingAlgorithm.filterActiveNodes(PageBreakingAlgorithm.java:1028)
    at
org.apache.fop.layoutmgr.BreakingAlgorithm.findBreakingPoints(BreakingAlgorithm.java:527)
    at
org.apache.fop.layoutmgr.BreakingAlgorithm.findBreakingPoints(BreakingAlgorithm.java:439)
    at
org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:369)
    at org.apache.fop.layoutmgr.PageBreaker.doLayout(PageBreaker.java:85)
    at
org.apache.fop.layoutmgr.PageSequenceLayoutManager.activateLayout(PageSequenceLayoutManager.java:107)
    at
org.apache.fop.area.AreaTreeHandler.endPageSequence(AreaTreeHandler.java:238)
    at
org.apache.fop.fo.pagination.PageSequence.endOfNode(PageSequence.java:120)
    at
org.apache.fop.fo.FOTreeBuilder$MainFOHandler.endElement(FOTreeBuilder.java:349)
    at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:177)
    at
org.apache.xalan.transformer.TransformerIdentityImpl.endElement(TransformerIdentityImpl.java:1050)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
Source)
    at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
    at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at
org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:452)

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