php-java-bridge-users Mailing List for PHP/Java Bridge

PHP/Java Bridge version 5.5.5 contains a beta version of a web based PHP
debugger called "PHPDebugger.php". At the moment it uses Ajax calls to
connect the JavaScript GUI with the PHPDebugger running on the web server.

These standard Ajax calls are slow, difficult to program and consume an
enormous amount of CPU time, even if the application is idle. We need is a
two-way communication channel to connect the JavaScript GUI with the
PHPDebugger script on the web server.

Google Chrome 4 supports "WebSockets", which allow JavaScript to communicate
with a HTTP script instance without any additional overhead. I will add
"WebSockets" support to both, the PHP script engine and the PHP/Java Bridge
version 5.5.6.

Apache/PHP already supports two-way communications using HTTP/1.1 chunked
connections. Example:

<?php
 $in = fopen("php//input");
 while(!feof($in)) {
  $data = fread($in, 8192);
  echo $data;
  if (ob_get_level()) ob_flush();
  flush();
 }
?>

Only the response headers must be changed according to the WebSocket spec
(Connection: Upgrade instead of Transfer-Encoding: chunked, etc.).

The JavaBridge/PhpFastCGIServlet currently does not support HTTP/1.1 chunked
connections. But changing the PhpFastCGIServlet.java should be easy. All we
need is a second parseBody() method, to be called when the Connection:
Upgrade request header exists.

I will implement it for PHP/Java Bridge 5.5.6.

References:
WebSocket protocol:
http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-70
PhpFastCGIServlet:
http://php-java-bridge.cvs.sourceforge.net/viewvc/php-java-bridge/php-java-bridge/server/php/java/servlet/fastcgi/FastCGIServlet.java?view=markup


Regards,
Jost Boekemeier

Hi,


You are right about the while loop. Here, the java_values function saved me
> again. It's probable that it is not the right way to solve it, so I will
> follow your advices.
>

java_values(...) is the right way. The java_is_null(), java_is_true() and
java_is_false() tests exist because I thought they're easier to read than an
expression like "if (java_values($jobject) === true) ... ".



Regards,
Jost Boekemeier

Thank you very much Jost,

I solved the problem just last night and you were right. I could catch the two Runtime Exceptions before the execSelect() call using the java_values() function. The problem was in the arguments format I was using. 

You are right about the while loop. Here, the java_values function saved me again. It's probable that it is not the right way to solve it, so I will follow your advices.

Either way I just starting and I think PHP / Java Bridge is a magnificent tool. I hope not to bother too often.

Thanks again.

> Date: Fri, 22 Jan 2010 11:59:09 +0100
> To: php...@li...
> From: php...@li...
> Subject: Re: [Php-java-bridge-users] Help
> 
> BTW: Which PHP version and which OS do you use? While testing the above code
> against the latest PHP 5.3.1, it appears that PHP 5.3.1 on Windows discards
> all error messages(!).
> 
> Please use a stable PHP version instead (PHP 5.2.x).
> 
> 
> > Is there (with PHP/Java Bridge) any special thing I have to consider when
> > I work with Java interfaces rather than classes?.
> 
> Your code is correct. Except for $rs->hasNext(), which returns a Boolean
> object. Your loop
> 
>   while($rs->hasNext())
> 
> never returns. Use an explicit boolean cast:
> 
>   while((boolean)(string)$rs->hasNext());
> 
> or
> 
>   while(java_is_true($rs->hasNext());
> 
> I think the reason why your query fails is that ModelD2RQ cannot parse an
> UTF-8 file. But that's a d2rq issue, I think.
> 
> 
> *Warning*: Unchecked exception detected:
> [[o:Response$UndeclaredThrowableErrorMarker]:"FATAL: Undeclared
> java.lang.RuntimeException detected. java.lang.Exception: CreateInstance
> failed: new de.fuberlin.wiwiss.d2rq.ModelD2RQ((o:String)[o:String]). Cause:
> de.fuberlin.wiwiss.d2rq.D2RQException: d2rq:uriPattern
> 'C:\wamp\www/mapping-iswc.n3#organizations/@@organizations.OrgID@@' contains
> characters not allowed in URIs (E50) VM: 1.6.0_16@http://java.sun.com/" at:
> #-22 de.fuberlin.wiwiss.d2rq.map.ResourceMap.buildValu[...]esult(false) #2
> C:\wamp\www\java\Java.inc(220): java_Client->getWrappedResult(false) #3
> C:\wamp\www\java\Java.inc(320): java_Client->getInternalResult() #4
> C:\wamp\www\java\Java.inc(1157):
> java_Client->createObject('de.fuberlin.wiw...', Array) #5
> C:\wamp\www\java\Java.inc(44) : eval()'d code(1): Java->Java(Array) #6
> C:\wamp\www\index.php(15):
> de\fuberlin\wiwiss\d2rq\ModelD2RQ->__construct('C:\wamp\www/map...') #7
> C:\wamp\www\index.php(26): PruebaSPARQL::test() #8 {main}] in *
> C:\wamp\www\java\Java.inc* on line *121*
> 
> *Warning*: Unchecked exception detected:
> [[o:Response$UndeclaredThrowableErrorMarker]:"FATAL: Undeclared
> java.lang.RuntimeException detected. java.lang.Exception: Invoke failed:
> [[c:QueryExecutionFactory]]->create((o:Query)[o:Query],
> (i:QuerySolution)[o:Response$UndeclaredThrowableErrorMarker]). Cause:
> java.lang.IllegalArgumentException: argument type mismatch VM: 1.6.0_16@
> http://java.sun.com/" at: #-9
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) #-8
> sun.reflect.NativeMethodAccessorImpl.invoke(Un[...]\Java.inc(977):
> java_Client->invokeMethod(4, 'create', Array) #5
> C:\wamp\www\java\Java.inc(44) : eval()'d code(1):
> java_invoke(Object(JavaClass), 'create', Array) #6 [internal function]:
> com\hp\hpl\jena\query\QueryExecutionFactory::__callStatic('create', Array)
> #7 C:\wamp\www\index.php(18):
> com\hp\hpl\jena\query\QueryExecutionFactory::create(Object(java_InternalJava),
> Object(de\fuberlin\wiwiss\d2rq\ModelD2RQ)) #8 C:\wamp\www\index.php(26):
> PruebaSPARQL::test() #9 {main}] in *C:\wamp\www\java\Java.inc* on line *121*
> exception:[[o:Exception]:"java.lang.Exception: Invoke failed:
> [[o:Response$UndeclaredThrowableErrorMarker]]->execSelect. Cause:
> java.lang.NoSuchMethodException: execSelect(). Candidates: [] VM: 1.6.0_16@
> http://java.sun.com/" at: #-6
> php.java.bridge.JavaBridge.checkM(JavaBridge.java:1091) #-5
> php.java.bridge.JavaBridge.Invoke(JavaBridge.java:1029) #-4
> php.java.bridge.Request.handleRequest(Request.java:415) #-3
> php.java.bridge.Request.handleRequests(Request.java:491) #-2
> php.java.bridge.http.ContextRunner.run(ContextRunner.java:145) #-1
> php.java.bridge.ThreadPool$Delegate.run(ThreadPool.java:60) #0
> C:\wamp\www\java\Java.inc(136): java_ThrowExceptionProxyFactory->getProxy(6,
> 'com.hp.hpl.jena...', 'T', true) #1 C:\wamp\www\java\Java.inc(219):
> java_Arg->getResult(true) #2 C:\wamp\www\java\Java.inc(221):
> java_Client->getWrappedResult(true) #3 C:\wamp\www\java\Java.inc(337):
> java_Client->getResult() #4 C:\wamp\www\java\Java.inc(1063):
> java_Client->invokeMethod(5, 'execSelect', Array) #5
> C:\wamp\www\java\Java.inc(1237): java_JavaProxy->__call('execSelect', Array)
> #6 [internal function]: java_exception->__call('execSelect', Array) #7
> C:\wamp\www\index.php(18): java_InternalException->execSelect() #8
> C:\wamp\www\index.php(26): PruebaSPARQL::test() #9 {main}]
> *Fatal error*: An unchecked exception occured during script execution.
> Please check the server log files for details. in *C:\wamp\www\java\Java.inc
> * on line *461*
> 
> 
> Regards,
> Jost Boekemeier
> ------------------------------------------------------------------------------
> Throughout its 18-year history, RSA Conference consistently attracts the
> world's best and brightest in the field, creating opportunities for Conference
> attendees to learn about information security's most important issues through
> interactions with peers, luminaries and emerging and established companies.
> http://p.sf.net/sfu/rsaconf-dev2dev
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
 		 	   		  
_________________________________________________________________
Juega y gana con Samsung y Windows Live
http://www.equipatucasa.com.mx

BTW: Which PHP version and which OS do you use? While testing the above code
against the latest PHP 5.3.1, it appears that PHP 5.3.1 on Windows discards
all error messages(!).

Please use a stable PHP version instead (PHP 5.2.x).


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

Your code is correct. Except for $rs->hasNext(), which returns a Boolean
object. Your loop

  while($rs->hasNext())

never returns. Use an explicit boolean cast:

  while((boolean)(string)$rs->hasNext());

or

  while(java_is_true($rs->hasNext());

I think the reason why your query fails is that ModelD2RQ cannot parse an
UTF-8 file. But that's a d2rq issue, I think.


*Warning*: Unchecked exception detected:
[[o:Response$UndeclaredThrowableErrorMarker]:"FATAL: Undeclared
java.lang.RuntimeException detected. java.lang.Exception: CreateInstance
failed: new de.fuberlin.wiwiss.d2rq.ModelD2RQ((o:String)[o:String]). Cause:
de.fuberlin.wiwiss.d2rq.D2RQException: d2rq:uriPattern
'C:\wamp\www/mapping-iswc.n3#organizations/@@organizations.OrgID@@' contains
characters not allowed in URIs (E50) VM: 1.6.0_16@http://java.sun.com/" at:
#-22 de.fuberlin.wiwiss.d2rq.map.ResourceMap.buildValu[...]esult(false) #2
C:\wamp\www\java\Java.inc(220): java_Client->getWrappedResult(false) #3
C:\wamp\www\java\Java.inc(320): java_Client->getInternalResult() #4
C:\wamp\www\java\Java.inc(1157):
java_Client->createObject('de.fuberlin.wiw...', Array) #5
C:\wamp\www\java\Java.inc(44) : eval()'d code(1): Java->Java(Array) #6
C:\wamp\www\index.php(15):
de\fuberlin\wiwiss\d2rq\ModelD2RQ->__construct('C:\wamp\www/map...') #7
C:\wamp\www\index.php(26): PruebaSPARQL::test() #8 {main}] in *
C:\wamp\www\java\Java.inc* on line *121*

*Warning*: Unchecked exception detected:
[[o:Response$UndeclaredThrowableErrorMarker]:"FATAL: Undeclared
java.lang.RuntimeException detected. java.lang.Exception: Invoke failed:
[[c:QueryExecutionFactory]]->create((o:Query)[o:Query],
(i:QuerySolution)[o:Response$UndeclaredThrowableErrorMarker]). Cause:
java.lang.IllegalArgumentException: argument type mismatch VM: 1.6.0_16@
http://java.sun.com/" at: #-9
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) #-8
sun.reflect.NativeMethodAccessorImpl.invoke(Un[...]\Java.inc(977):
java_Client->invokeMethod(4, 'create', Array) #5
C:\wamp\www\java\Java.inc(44) : eval()'d code(1):
java_invoke(Object(JavaClass), 'create', Array) #6 [internal function]:
com\hp\hpl\jena\query\QueryExecutionFactory::__callStatic('create', Array)
#7 C:\wamp\www\index.php(18):
com\hp\hpl\jena\query\QueryExecutionFactory::create(Object(java_InternalJava),
Object(de\fuberlin\wiwiss\d2rq\ModelD2RQ)) #8 C:\wamp\www\index.php(26):
PruebaSPARQL::test() #9 {main}] in *C:\wamp\www\java\Java.inc* on line *121*
exception:[[o:Exception]:"java.lang.Exception: Invoke failed:
[[o:Response$UndeclaredThrowableErrorMarker]]->execSelect. Cause:
java.lang.NoSuchMethodException: execSelect(). Candidates: [] VM: 1.6.0_16@
http://java.sun.com/" at: #-6
php.java.bridge.JavaBridge.checkM(JavaBridge.java:1091) #-5
php.java.bridge.JavaBridge.Invoke(JavaBridge.java:1029) #-4
php.java.bridge.Request.handleRequest(Request.java:415) #-3
php.java.bridge.Request.handleRequests(Request.java:491) #-2
php.java.bridge.http.ContextRunner.run(ContextRunner.java:145) #-1
php.java.bridge.ThreadPool$Delegate.run(ThreadPool.java:60) #0
C:\wamp\www\java\Java.inc(136): java_ThrowExceptionProxyFactory->getProxy(6,
'com.hp.hpl.jena...', 'T', true) #1 C:\wamp\www\java\Java.inc(219):
java_Arg->getResult(true) #2 C:\wamp\www\java\Java.inc(221):
java_Client->getWrappedResult(true) #3 C:\wamp\www\java\Java.inc(337):
java_Client->getResult() #4 C:\wamp\www\java\Java.inc(1063):
java_Client->invokeMethod(5, 'execSelect', Array) #5
C:\wamp\www\java\Java.inc(1237): java_JavaProxy->__call('execSelect', Array)
#6 [internal function]: java_exception->__call('execSelect', Array) #7
C:\wamp\www\index.php(18): java_InternalException->execSelect() #8
C:\wamp\www\index.php(26): PruebaSPARQL::test() #9 {main}]
*Fatal error*: An unchecked exception occured during script execution.
Please check the server log files for details. in *C:\wamp\www\java\Java.inc
* on line *461*


Regards,
Jost Boekemeier

Hi,


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


Quick and dirty translation:


<?php require_once("java/Java.inc");

$here=getcwd();
java_autoload("$here/d2r-server-0.7/lib;$here/ARQ-2.8.2/lib");

use de\fuberlin\wiwiss\d2rq\ModelD2RQ as ModelD2RQ;
use com\hp\hpl\jena\query\QueryFactory as QueryFactory;
use com\hp\hpl\jena\query\QueryExecutionFactory as QueryExecutionFactory;

try {
class PruebaSPARQL {
 public static function test() {
   global $here;
   $m = new ModelD2RQ("$here/mapping-iswc.n3");
   $sparql = "SELECT * WHERE {}";
   $q = QueryFactory::create($sparql);
   $rs = QueryExecutionFactory::create($q, $m)->execSelect();
   while (java_is_true(rs.hasNext())) {
    $row = $rs->nextSolution();
    echo "Carrera: " . $row->getLiteral("carrera")->getString();
   }

  }
}
pruebaSPARQL::test();

} catch (Exception $e) {
 echo "exception:$e";
}

?>


Regards,
Jost Boekemeier

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
> ------------------------------------------------------------------------------
> Throughout its 18-year history, RSA Conference consistently attracts the
> world's best and brightest in the field, creating opportunities for Conference
> attendees to learn about information security's most important issues through
> interactions with peers, luminaries and emerging and established companies.
> http://p.sf.net/sfu/rsaconf-dev2dev
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
 		 	   		  
_________________________________________________________________
Juega y gana con Samsung y Windows Live
http://www.equipatucasa.com.mx

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

Hi,

I have a question.

Can I do something like this:

ResultSet rs = QueryExecutionFactory.create(q, m).execSelect(); 

(where ResultSet rs is a java interface, QueryExecutionFactory.create(q,m) returns a java interface and execSelect() function is declared in this interface).

with PHP/Java Bridge?

In Java I can.

How can I do that?

I have tried this:

$query = Java("com.hp.hpl.jena.query.QueryFactory")->create($sparqlString); //---OK.
$rs = Java("com.hp.hpl.jena.query.QueryExecutionFactory")->create($query, $modelD2RQ)->execSelect(); //---crash here

but it replies:

java stack trace: java.lang.Exception: Invoke failed:
[[o:Response$UndeclaredThrowableErrorMarker]]->execSelect. Cause:
java.lang.NoSuchMethodException: execSelect(). Candidates: [] VM:
1.6.0_17@http://java.sun.com/ at
php.java.bridge.JavaBridge.checkM(JavaBridge.java:1091) at
php.java.bridge.JavaBridge.Invoke(JavaBridge.java:1029) at
php.java.bridge.Request.handleRequest(Request.java:415) at
php.java.bridge.Request.handleRequests(Request.java:491) at
php.java.bridge.http.ContextRunner.run(ContextRunner.java:145) at
php.java.bridge.ThreadPool$Delegate.run(ThreadPool.java:60)
Caused by: java.lang.NoSuchMethodException: execSelect(). Candidates:
[] ... 6 more


Thanks in advance.


 		 	   		  
_________________________________________________________________
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