Re: [Php-java-bridge-users] Help

[<php...@li...>]

Hi,

As you adviced me, I have tried to catch a RuntimeException before the execSelect call, but I have no success.

Here is the Java Code I want to transform to PHP code with PHP/Java Bridge:

import de.fuberlin.wiwiss.d2rq.*;                                
import com.hp.hpl.jena.query.*;                                    

class pruebaSPARQL{
  public pruebaSPARQL()
  {               
    super();
  }    
  
  public static void main(String argv[]) 
  {    
      // Load mapping file
    ModelD2RQ m = new ModelD2RQ("D:/DOCUMENTOS/alejandro/Maestria/tesis/egresados/herramientas/d2r-server-0.7/mapvariasLapOnto.n3");
    String sparql = 
        "PREFIX onto: <http://localhost/egresados/site/egresado.owl#>" + 
        "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>" +   
        "SELECT DISTINCT ?carrera WHERE {" + 
        "    ?egresado onto:Carrera ?carrera . " +    
        "}";
    Query q = QueryFactory.create(sparql); 
    ResultSet rs = QueryExecutionFactory.create(q, m).execSelect();
    while (rs.hasNext()) {
        QuerySolution row = rs.nextSolution();
        System.out.println("Carrera: " + row.getLiteral("carrera").getString());    
    }
  }
}

According to "http://jena.sourceforge.net/ARQ/javadoc/com/hp/hpl/jena/query/package-summary.html", QueryExecutionFactory.create(q, m) returns a QueryExecution Java interface and the execSelect() call should returns a ResultSet Java interface.

Is there (with PHP/Java Bridge) any special thing I have to consider when I work with Java interfaces rather than classes?.

Here is what I have tried with PHP/Java Bridge.

<?php
    define ("JAVA_PREFER_VALUES", true);
    require_once("http://localhost:8080/egresados/java/Java.inc");
    class PRUEBA
    {        
        public function execute()
        {
            $java_library_path = "D:\\DOCUMENTOS\\alejandro\\Maestria\\tesis\\egresados\\herramientas\\Jena-2.6.2\\lib\\;D:\\DOCUMENTOS\\alejandro\\Maestria\\tesis\\egresados\\herramientas\\d2r-server-0.7\\lib\\";
            try {        
                java_require($java_library_path);        
                $modelD2RQ = new Java("de.fuberlin.wiwiss.d2rq.ModelD2RQ", "D:\\DOCUMENTOS\\alejandro\\Maestria\\tesis\\egresados\\herramientas\\d2r-server-0.7\\mapvariasLapOnto.n3");
                $sparqlString = htmlentities("PREFIX onto: <http://localhost/egresados/site/egresado.owl#>" . 
                        "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>" .   
                        "SELECT DISTINCT ?carrera WHERE {" . 
                        "    ?egresado onto:Carrera ?carrera . " .    
                        "}");
                echo $sparqlString;
                $query = Java("com.hp.hpl.jena.query.QueryFactory")->create($sparqlString);                                
                $rs = Java("com.hp.hpl.jena.query.QueryExecutionFactory")->create($query, $modelD2RQ)->execSelect();                    
                   /*while($rs.hasNext()){
                      //$row = new java("com.hp.hpl.jena.query.QuerySolution");
                      $row = $rs.nextSolution();
                      echo $row.getLiteral("carrera").getString();          
                   }*/               
            }catch (JavaException $ex) {
                $trace = new Java("java.io.ByteArrayOutputStream");
                $ex->printStackTrace(new Java("java.io.PrintStream", $trace));
                print "java stack trace: $trace\n";
            }
        }
    }
?>

Sincerly, thank you very much.

> Date: Sun, 17 Jan 2010 20:18:14 +0100
> To: php...@li...
> From: php...@li...
> Subject: Re: [Php-java-bridge-users] Help
> 
> Hi,
> 
> like other containers (EJB for example), the PHP/Java Bridge container
> terminates the current transaction if a java.lang.RuntimeException or
> java.lang.Error crosses the container boundary. However, it does not
> terminate it immediately, to give you a chance to clear the error condition
> before the PHP script terminates.
> 
> Please see
> http://php-java-bridge.sourceforge.net/pjb/docs/php-api/JavaBridge/_JavaProxy.inc.html#functionjava_last_exception_clear
> for details.
> 
> Please see our FAQ entry "Why doesn't the bridge throw a
> java.lang.RuntimeException or Error as a PHP JavaException by default?"
> 
> 
> > [[o:Response$
> > UndeclaredThrowableErrorMarker]]->execSelect. Cause:
> > java.lang.NoSuchMethodException: execSelect(). Candidates: [] VM:
> 
> please take a look at the error message again; your code:
> 
> $query = Java("com.hp.hpl.jena.query.QueryFactory")->create($sparqlString);
> //---OK.
> 
> has thrown a java.lang.Error or java.lang.RuntimeException, which is
> reported as a PHP warning. In the next step you ignore the warning, take the
> RuntimeException and try to invoke execSelect() on it, which fails, of
> course.
> 
> If you want java.lang.Error and java.lang.RuntimeException to fail fast,
> define("JAVA_PREFER_VALUES", true) before including Java.inc.
> 
> 
> Regards,
> Jost Boekemeier
> ------------------------------------------------------------------------------
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