Re: [basex-talk] Adventures with XQJ

Thanks, Arthur. If there is any chance to get an SSCCE that would be marvellous ;)

Gardner, Arthur arthur.gardner@metlife.com schrieb am Do., 16. Mai 2019, 17:36:

I found the difference between the snippet and our existing code. In our case, there will only ever be one result. But the second next() should return false. Instead, it throws an Exception.

Existing (fails with BaseX):

while (rs.next()) {

            rs.writeSequenceToResult(new StreamResult(sw));

}

Snippet (works):

rs.next();

rs.writeSequenceToResult(new StreamResult(sw));

Arthur Gardner | Infosys Ltd

MetLife | Clarks Summit, PA

Office 570-587-6898 | Mobile 262-442-7472

*From:* Gardner, Arthur *Sent:* Wednesday, May 15, 2019 2:09 PM *To:* Christian Grün christian.gruen@gmail.com *Cc:* basex-talk@mailman.uni-konstanz.de *Subject:* RE: [EXT] Re: [basex-talk] Adventures with XQJ

No, I can’t.

To elaborate, I wrote a code snippet, covering all that I need to do, and it worked.

So the issue is with us.

😊

Arthur Gardner | Infosys Ltd

MetLife | Clarks Summit, PA

Office 570-587-6898 | Mobile 262-442-7472

*From:* Christian Grün christian.gruen@gmail.com *Sent:* Tuesday, May 14, 2019 2:06 PM *To:* Gardner, Arthur arthur.gardner@metlife.com *Cc:* basex-talk@mailman.uni-konstanz.de *Subject:* [EXT] Re: [basex-talk] Adventures with XQJ

Hi Arthur,

Can you provide us with a little code snippet (ideally self-contained) that allows us to reproduce the problem?

Examples on how to run queries via Java (with and without XQJ) can be found in our Wiki [1].

Thanks in advance,

Christian

[1] http://docs.basex.org/wiki/Java_Examples

On Tue, May 14, 2019 at 7:58 PM Gardner, Arthur < arthur.gardner@metlife.com> wrote:

Hi folks.

First a disclaimer: I’m omitting a lot of information, because there is hardly any limit to what I *could* include.

Instead, I’ll mention what seems most important, then dialog if anyone shows an interest.

The objective: convert an existing private java library from ddxq to BaseX.

I am using these libraries, all coming to me via BaseX (I think):

[image: cid:image001.jpg@01D50B27.AF8CFBA0]

My intention is to use the local option … this library is already running in the server (or in Eclipse).

*import* net.xqj.basex.local.BaseXXQDataSource;

Here’s my connection code (actually a constructor method):

   *public* XQTransformer (String xqueryName) *throws* Exception

   {

         String queryPath = String.*format*(*filePath*, xqueryName);

         URI queryUri = *new* URI(queryPath);

         FileReader xqueryReader = *new* FileReader(*new* File(

queryUri));

         xqds = *new* BaseXXQDataSource();

         //xqds.setOptions("serialize=indent=yes");

         //xqds.setBaseUri(queryPath);

         xqconnection = xqds.getConnection();

         XQStaticContext context = xqconnection.getStaticContext();

        context.setBindingMode(XQConstants.*BINDING_MODE_IMMEDIATE*);

         xqconnection.setStaticContext(context);

         xqpe = xqconnection.prepareExpression(xqueryReader);

   }

setBaseUri is for references from the xQuery to helper files in the same directory. Later I compensate by overriding the current user directory.

But I am throwing an Exception here:

                *while* (!rs.isClosed() && rs.next()) {

*java.lang.NullPointerException*

   at org.basex.query.QueryContext.next(*QueryContext.java:353*)

   at org.basex.query.expr.gflwor.GFLWOR$1.next(*GFLWOR.java:64*)

   at org.basex.query.QueryContext.next(*QueryContext.java:353*)

   at org.basex.query.scope.MainModule$1.next(*MainModule.java:101*)

   at net.xqj.basex.bin.h.b(Unknown Source)

   at net.xqj.basex.bin.r.a(Unknown Source)

   at net.xqj.basex.bin.bL.next(Unknown Source)

   at net.xqj.basex.bin.bR.next(Unknown Source)

   at com.emc.metlife.util.xql.XqueryTransformation.xmlFormatted(

*XqueryTransformation.java:89*)

   at com.emc.metlife.util.xql.XqueryTransformation.getTransformedData(

*XqueryTransformation.java:194*)

   at com.emc.metlife.util.xql.XqueryPooledTester.test(

*XqueryPooledTester.java:58*)

   at com.emc.metlife.util.xql.XqueryPooledTester.main(

*XqueryPooledTester.java:43*)

The particular xquery file is working for me in the BaseX GUI.

Thanks!

Arthur Gardner | Infosys Ltd

MetLife | Clarks Summit, PA

Office 570-587-6898 | Mobile 262-442-7472

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