[ http://issues.apache.org/jira/browse/XALANJ-1364?page=all ]
Brian Minchau updated XALANJ-1364:
----------------------------------
Version: 2.7
(was: Latest Development Code)
> Random NullPointerExceptions in DTM traversal
> ---------------------------------------------
>
> Key: XALANJ-1364
> URL: http://issues.apache.org/jira/browse/XALANJ-1364
> Project: XalanJ2
> Type: Bug
> Components: DTM
> Versions: 2.7
> Environment: Operating System: Windows NT/2K
> Platform: PC
> Reporter: Vikram Pillai
> Assignee: Xalan Developers Mailing List
>
> I see the following exception on some traversals of the DOM and not on
> others.
> It typically happens when the system is heavily loaded and there are a number
> of traversals occurring concurrently. In reading the source for DOM2DTM, pos
> being null seems to be a "should never arise" situation -- but it certainly
> seems to be exercised for me. BTW I'm using CachedXPathAPI because the DOM
> can
> change between calls to XPathAPI.selectNodes.
> Is there any way to turn off the DTM optimization. I'm willing to accept the
> performance hit if the traversals work reliably.
> java.lang.NullPointerException
> at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java:421)
> at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.getHandleFromNode
> (DOM2DTM.java:710)
> at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.getHandleOfNode
> (DOM2DTM.java:762)
> at org.apache.xml.dtm.ref.DTMManagerDefault.getDTMHandleFromNode
> (DTMManagerDefault.java:620)
> at org.apache.xpath.XPathContext.getDTMHandleFromNode
> (XPathContext.java:220)
> at org.apache.xpath.CachedXPathAPI.eval(CachedXPathAPI.java:326)
> at org.apache.xpath.CachedXPathAPI.selectNodeIterator
> (CachedXPathAPI.java:216)
> at org.apache.xpath.CachedXPathAPI.selectSingleNode
> (CachedXPathAPI.java:177)
> at com.silverbacktech.cpe.xml.XPathAPI.selectSingleNode
> (XPathAPI.java:13)
> at com.silverbacktech.cpe.xml.XSL.selectSingleNode(XSL.java:43)
> at com.silverbacktech.cpe.xhandler.ReportHandler.select
> (ReportHandler.java:106)
> at com.silverbacktech.cpe.xhandler.ReportHandler.lookupAll
> (ReportHandler.java:30)
> at com.silverbacktech.core.xspace.BaseHandler.lookup
> (BaseHandler.java:55)
> at com.silverbacktech.core.xspace.VirtualNodeExpander.expand
> (XSpaceExpander.java:277)
> at com.silverbacktech.core.xspace.XSpaceExpander.expand
> (XSpaceExpander.java:56)
> at com.silverbacktech.core.xspace.XSpace.selectSingleNode
> (XSpace.java:122)
> at com.silverbacktech.cpe.seil.XSpaceServlet.doGet
> (XSpaceServlet.java:82)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:499)
> at com.silverbacktech.cpe.seil.SBServlet.service(SBServlet.java:243)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
> at org.apache.jserv.JServConnection.processRequest
> (JServConnection.java:317)
> at org.apache.jserv.JServConnection.run(JServConnection.java:188)
> at java.lang.Thread.run(Unknown Source)
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