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):

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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