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ArrayIndexOutOfBoundsException
Added by Anonymous about 18 years ago
Legacy ID: #3981625
Legacy Poster: jbreure (jbreure)
Hi, We use SAXON for our application and it has never failed us until a couple of
days ago. And since then, we cannot find a workaround. One specific script throws an
ArrayIndexOutOfBoundsException at random times, with various indexes but always for the
method getElementList in the class TinyDocumentImpl. This particular XSLT stylesheet is
accessing a lot of external files and each external access is using a URL which will
return an XML file through another XSLT transformation on the same server. This system
works fine for all our other scripts but for this particular one which is heavier than
the others, it fails most of the time (but not always). The exception seems to happen at
random times (sometimes at the beginnng of the script, or in the middle or at the end),
and the error message is ususally different (the value of the index). We are currently
using SAXON 8b.7.3 and tried 8b.8. Strangley enough, it worked fine the four or five
first times we used SAXON 8b.8 but now, the error is thrown almost every time (even
after restarting the web server). Thanks, Jean-Baptiste REURE The error message is as
follows: java.lang.ArrayIndexOutOfBoundsException: 173 at
net.sf.saxon.tinytree.TinyDocumentImpl.getElementList(TinyDocumentImpl.java:186) at
net.sf.saxon.tinytree.TinyDocumentImpl.getAllElements(TinyDocumentImpl.java:164) at
net.sf.saxon.tinytree.TinyNodeImpl.iterateAxis(TinyNodeImpl.java:435) at
net.sf.saxon.expr.AxisExpression.iterate(AxisExpression.java:381) at
net.sf.saxon.expr.PathExpression.map(PathExpression.java:814) at
net.sf.saxon.expr.ContextMappingIterator.next(ContextMappingIterator.java:55) at
net.sf.saxon.value.SequenceExtent.<init>(SequenceExtent.java:105) at
net.sf.saxon.sort.DocumentOrderIterator.<init>(DocumentOrderIterator.java:30)
at net.sf.saxon.sort.DocumentSorter.iterate(DocumentSorter.java:68) at
net.sf.saxon.expr.VennExpression.iterate(VennExpression.java:315) at
net.sf.saxon.expr.VennExpression.iterate(VennExpression.java:315) at
net.sf.saxon.instruct.CopyOf.processLeavingTail(CopyOf.java:111) at
net.sf.saxon.instruct.Block.processLeavingTail(Block.java:353) at
net.sf.saxon.instruct.Instruction.process(Instruction.java:91) at
net.sf.saxon.expr.LetExpression.process(LetExpression.java:221) at
net.sf.saxon.instruct.ForEach.processLeavingTail(ForEach.java:244) at
net.sf.saxon.instruct.Instruction.process(Instruction.java:91) at
net.sf.saxon.expr.LetExpression.process(LetExpression.java:221) at
net.sf.saxon.instruct.DocumentInstr.evaluateItem(DocumentInstr.java:240) at
net.sf.saxon.expr.ExpressionTool.evaluate(ExpressionTool.java:360) at
net.sf.saxon.expr.LetExpression.eval(LetExpression.java:182) at
net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:343) at
net.sf.saxon.instruct.Block.processLeavingTail(Block.java:353) at
net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:352) at
net.sf.saxon.instruct.Block.processLeavingTail(Block.java:353) at
net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:352) at
net.sf.saxon.instruct.Block.processLeavingTail(Block.java:353) at
net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:99) at
net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:319) at
net.sf.saxon.instruct.ApplyTemplates.defaultAction(ApplyTemplates.java:351) at
net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:312) at
net.sf.saxon.Controller.transformDocument(Controller.java:1602) at
net.sf.saxon.Controller.transform(Controller.java:1426)
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Legacy ID: #3982869
Legacy Poster: Michael Kay (mhkay)
Thanks for reporting this. I'm afraid there's not much I can do unless I can
reproduce it. I appreciate this might be difficult if you're having trouble getting it
to happen predictably yourself. However, I'd be very grateful if you can try to find
some way of isolating it and sending me the program that causes it to happen. The code
is walking off the end of an array because there ought to be a
"stopper" node at the end with depth=0, and is seems this is missing -
so the code in error is not actually the code that failed. However, I might be able to
code the method that's failing more defensively so it doesn't crash in this situation.
Michael Kay
Legacy ID: #4033051
Legacy Poster: jbreure (jbreure)
Hi Michael, Sorry for the late reply, we've been tracking down the issue and busy
with other internal ones. We couldn't localize the problem and what was causing it,
apart from the fact that it was when accessing a whole lot of external documents using
the document() function. As a fix, we now use java to load the external files and pass
them to the XSLT in the input XML but it would be better for us to do more in the XSLT
and less in the Java. You mention a fix to the method to have it fail gracefully instead
of throwing an exception, any news on this? Maybe it would help us. Thanks, JB.
Legacy ID: #4034068
Legacy Poster: Michael Kay (mhkay)
It's running off the end of an array in the TinyTree; it should hit a stopper node
that prevents this, but it seems that the stopper node hasn't been added. There seem to
be other paths navigating the same array that don't rely on the presence of the stopper
node, so I will change this path to work the same way, even though I can't actually
reproduce the problem.
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