#81 NPE at Assignation.evaluateVariable

[Anonymous]

Saxon 9.7.0-4. I run the following query:

declare namespace s=\"http://tpox-benchmark.com/security\";
declare namespace c=\"http://tpox-benchmark.com/custacc\";
declare variable $id external;
for $cust in fn:collection()/c:Customer[@id=$id]
for $sec in fn:collection()/s:Security[s:Symbol=$cust/c:Accounts/c:Account/c:Holdings/c:Position/c:Symbol/fn:string(.)]
return <Security>{$sec/s:Name/text()}</Security>

providing a particular $id and iterate through expression tree. When I do evaluateVariable for one of VariableReferences NPE is thrown:

java.lang.NullPointerException: null
at net.sf.saxon.om.SequenceTool.toGroundedValue(SequenceTool.java:49) ~[Saxon-HE-9.7.0-4.jar:na]
at net.sf.saxon.expr.Assignation.evaluateVariable(Assignation.java:130) ~[Saxon-HE-9.7.0-4.jar:na]
..........

Please have a look.
Note: I just moved to Saxon 9.7. Earlier I use Saxon 9.5.1-8 and had no this NPE issue on the same query.

Thanks, Denis.

[oneil]

Hi Denis,

Thanks for reporting the problem you have found. I am having trouble reproducing the NPE. Is it possible that you send over a simple source document and provide the command line that you use.

BTW. We have moved all support issues to the following site: https://saxonica.plan.io https://saxonica.plan.io/ With the project: https://saxonica.plan.io/projects/saxon https://saxonica.plan.io/projects/saxon

Just add details here: https://saxonica.plan.io/issues/2695 https://saxonica.plan.io/issues/2695

kind regards,

O’Neil

On 5 Apr 2016, at 08:07, Ticket 81 81@support-requests.saxon.p.re.sf.net wrote:

[support-requests:#81] https://sourceforge.net/p/saxon/support-requests/81/ NPE at Assignation.evaluateVariable

Status: open
Group: v1.0_(example)
Created: Tue Apr 05, 2016 07:07 AM UTC by Anonymous
Last Updated: Tue Apr 05, 2016 07:07 AM UTC
Owner: nobody

Saxon 9.7.0-4. I run the following query:

declare namespace s=\"http://tpox-benchmark.com/security\";
declare namespace c=\"http://tpox-benchmark.com/custacc\";
declare variable $id external;
for $cust in fn:collection()/c:Customer[@id=$id]
for $sec in fn:collection()/s:Security[s:Symbol=$cust/c:Accounts/c:Account/c:Holdings/c:Position/c:Symbol/fn:string(.)]
return <Security>{$sec/s:Name/text()}</Security>

providing a particular $id and iterate through expression tree. When I do evaluateVariable for one of VariableReferences NPE is thrown:

java.lang.NullPointerException: null
at net.sf.saxon.om.SequenceTool.toGroundedValue(SequenceTool.java:49) ~[Saxon-HE-9.7.0-4.jar:na]
at net.sf.saxon.expr.Assignation.evaluateVariable(Assignation.java:130) ~[Saxon-HE-9.7.0-4.jar:na]
..........

Please have a look.
Note: I just moved to Saxon 9.7. Earlier I use Saxon 9.5.1-8 and had no this NPE issue on the same query.

Thanks, Denis.

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[Anonymous]

Hi O'Neil,

Thanks for the quick response.
Yes, I'm aware about the new issue tracker, but haven't found how to submit a new issue there. Do I need to register in order to do so?

Regarding the NPE: I use Saxon via its Java API. I have a custom CollectionFinder class. When Saxon run XQuery against collection(-s) I analyze expression tree and return back custom ResourceCollection which select documents dynamically from my external data store. So, the NPE happens even before I select any source document.

A piece of code where NPE happens is:

    if (ex instanceof GeneralComparison10 || ex instanceof GeneralComparison20 || ex instanceof ValueComparison) {
        BinaryExpression be = (BinaryExpression) ex;
        Object value = null;
        String pName = null;
        for (Operand o: be.operands()) {
            Expression e = o.getChildExpression();
            if (e instanceof VariableReference) {
                Binding bind = ((VariableReference) e).getBinding();
                if (bind instanceof LetExpression) {
                    Expression e2 = ((LetExpression) bind).getSequence();
                    if (e2 instanceof Atomizer) {
                        e2 = ((Atomizer) e2).getBaseExpression();
                        if (e2 instanceof VariableReference) {
                            // paired ref to the e
                            pName = ((VariableReference) e2).getBinding().getVariableQName().getLocalPart(); 
                        }
                    }
                }

                if (pName == null) {
                    pName = bind.getVariableQName().getClarkName();
                }
                value = getValues(bind.evaluateVariable(ctx)); // NPE happens here!
                break;
            } else if (e instanceof StringLiteral) {
                value = ((StringLiteral) e).getStringValue();
                break;
            } else if (e instanceof Literal) {
                value = getValues(((Literal) e).getValue()); 
                break;
            }
        }

.........

Thanks, Denis