php-java-bridge-users Mailing List for PHP/Java Bridge (Page 3)

The service script shipped with the archive does not work on my debian
machine. I don't have as much knowledge of linux as I'd like, so could
anybody give me some advice?

The "deamon" command used by the script is not available on my machine, and
neither is /etc/rc.d/init.d/functions.

Has anybody on the list already written a startup script for debian?

Thanks,

Michael

When running the bridge with in internal java process started by the web
server (Apache2/PHP5), I get these messages a lot.

PHP Notice:  php_mod_java(57): waiting for server another 14 seconds in
Unknown on line 0

For example, every time I run the php executable on the command line.

Is there something wrong? Everything seems to be working fine. What can be
done to suppress these messages?

Any help is appreciated.

Thanks,

Michael

Your suggested solution worked after I put quotes around my numeric
parameter -- the BigInteger constructor doesn't take Longs, but it does
take Strings!

$docRef->setVersion(new java("java.lang.BigInteger","1"));

Thanks for your help,
--Jon


-----Original Message-----
From: Jost Boekemeier [mailto:jos...@ya...]=20
Sent: Thursday, November 10, 2005 2:25 PM
To: Abbett, Jonathan; php...@li...
Subject: Ant: [Php-java-bridge-users] Bridge turns BigInteger into a
double?

Hi Jonathan,

please always create a java value explicitly instead
of relying on auto-conversions for php values[1]:

Instead of

  $obj->method($phpVal);

use

  $obj->method(new java("<param-class>", $phpVal));


So your example would read:

  $docRef->setVersion(new java("java.lang.BigInteger",
1));


> It looks like the PHP-Java Bridge is transforming my
> BigInteger=20

When possible a java value is represented as a php
value. "Possible" means: All sub-types of
java.lang.Number are represented as a php exact or
inexact number and all java strings are represented as
a UTF-8 encoded[2] php string.  Everything else is
represented as a opaque object handle.

To create an object handle for such a php value one
has to invoke the constructor as shown above.


Regards,
Jost Boekemeier

[1] all instances of java.lang.Number and all
instances of java.lang.String

[2] encoding can be changed with e.g.: java_set_file_encoding("ASCII").


=09

=09
	=09
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Hi Jonathan,

please always create a java value explicitly instead
of relying on auto-conversions for php values[1]:

Instead of

  $obj->method($phpVal);

use

  $obj->method(new java("<param-class>", $phpVal));


So your example would read:

  $docRef->setVersion(new java("java.lang.BigInteger",
1));


> It looks like the PHP-Java Bridge is transforming my
> BigInteger 

When possible a java value is represented as a php
value. "Possible" means: All sub-types of
java.lang.Number are represented as a php exact or
inexact number and all java strings are represented as
a UTF-8 encoded[2] php string.  Everything else is
represented as a opaque object handle.

To create an object handle for such a php value one
has to invoke the constructor as shown above.


Regards,
Jost Boekemeier

[1] all instances of java.lang.Number and all
instances of java.lang.String

[2] encoding can be changed with e.g.: java_set_file_encoding("ASCII").


	

	
		
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I have a method that takes a BigInteger as input, but I can't seem to
get a BigInteger in there.  A code fragment:

=20

$docRef =3D $factory->createDocumentReferenceType();

$bigint =3D new java_class("java.math.BigInteger");

$docRef->setVersion($bigint->valueOf(1));

=20

I get an exception on that last line, which is reported in the PHP error
log:

=20

PHP Fatal error:  Uncaught [class java.lang.Exception:
java.lang.Exception: Invoke failed:
[org.chip.ping.xml.annotation.impl.DocumentReferenceTypeImpl@15b44d6]->s
etVersion(class java.lang.Double). Cause:
java.lang.IllegalArgumentException: argument type mismatch]

...

=20

It looks like the PHP-Java Bridge is transforming my BigInteger into a
java.lang.Double.  How do I prevent this from happening?  What
alternatives do I have?

=20

Thanks,

Jon Abbett

=20

=20

=20

=20

Does anyone know how to create a java two-dimensional array
and set its value of each element in php-code?
Thanks for your attention and help.

For example: one-dimensional array
<?php
 $Array =3D new JavaClass("java.lang.reflect.Array");
$String =3D new JavaClass("java.lang.String");
$entries =3D $Array->newInstance($String, 3);
$entries[0] =3D"a";
$entries[1] =3D"b";
$entries[2] =3D"c";
?>

Hi,

security concerns aside[1], please see PR1235199
(http://sourceforge.net/tracker/index.php?func=detail&aid=1235199&group_id=117793&atid=679233),
it contains a description how to pass additional
options to the JVM.


Regards,
Jost Boekemeier

[1] Setting java.awt.headless=false would allow php
scripts to access the graphics display, at least on
windows (on unix the attacker needs permission to
access the display, e.g. via xhost +). This would
enable php scripts to log key events: passwords etc.


	

	
		
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Hi Victor,

the easiest way is to install the j2ee backend
(http://prdownloads.sourceforge.net/php-java-bridge/php-java-bridge.j2ee_2.0.8.zip?download).
It allows you to convert your jsp files to php step by
step.

Assuming that your web application is called myApp and
you want to run php files:

* copy webapps/JavaBridge/WEB-INF/lib/JavaBridge.jar
and the controller servlet classes from
JavaBridge/WEB-INF/classes/ to webapps/myApp/WEB-INF/

* add the servlet mapping to your WEB-INF/web.xml,
please see JavaBridge/WEB-INF/web.xml for a template.
Please set the init-param "override_hosts" to Off and
set the correct hosts and servlet in your php.ini:

* use the following lines in your php.ini
 [java]
 java.hosts="127.0.0.1:8080"
 java.servlet="/myApp/PhpJavaServlet"

If you browse to http://localhost:8080/myApp, you
should be able to develop and invoke your php files.


For a production system please start Apache and browse
to http://yourHost.com/myApp. The php modules will
call to the java backend as neccesary.

In case you have a distribution where the tomcat
webapps and the apache htdocs directories are not
shared, please either use a symlink or use mod jk to
"JkMount" the tomcat webapps directory into apache
(please see the readme for details).


Regards,
Jost Boekemeier



	

	
		
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I have a situation where I'm running Java under the PJB and it needs 
access to the X server. In this case, the flag normally passed in to 
Java "-Djava.awt.headless=true" causes my application not to work 
right.  I had to change the file bind.c and recompile to change the 
parameter to "-Djava.awt.headless=false" so that my software could work.

It would be nice if this were a configurable option.

Hi,
  I have some JSP code, and I want to convert them to
PHP by using php-java-bridge.  Is there a easy way to
do it?
Many thanks.

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Hi Victor,

[I assume that you want to use PHP scripts from java
projects like tapestry, java server faces, etc.]
> where can I find more tutorial about how to use this
> bridge?

A tutorial doesn't exist at the moment.  However, it
is planned for version 3.0 and 2.0.9.


>  I also need more code examples that use this
> bridge. 

At the moment only the php API functions are
documented (->http://php-java-bridge.sf.net).

If you want to use the bridge from java code, I
suggest to use the script API, which will be available
with jdk1.6, please see
http://download.java.net/jdk6/docs/api/javax/script/package-summary.html
and
http://sourceforge.net/mailarchive/forum.php?thread_id=8895955&forum_id=42415


> The documentation is not that detail.  I don't know
> what many of the functions do even after I read the
> documentation come with the code itself.

Which functions do you mean specifically?


Regards,
Jost Boekemeier


	

	
		
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Hi Corey,

please excuse the delay.

> I running PHP Version 4.3.4
[...]
> Warning: dl(): Unable to load dynamic library 
> '/usr/lib/php/extensions/java.so' -
> /usr/lib/php/extensions/java.so: 
> undefined symbol: zend_ce_arrayaccess in
> /srv/www/htdocs/test.php on line 12

This sounds similar to PR1181710 (please see
http://sourceforge.net/tracker/index.php?func=detail&aid=1181710&group_id=117793&atid=679233).

Are you shure that you have created the java.so
against the php 4.3.4 ABI -- or have you copied the
java.so from somwhere else?

Can you please create a ticket for this (please use
http://sourceforge.net/tracker/?func=add&group_id=117793&atid=679233)
and attach the java.so to this ticket?

I will check this asap.


Regards,
Jost Boekemeier



	

	
		
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Hi,
  I am new in this php-java-bridge.  Do you know where
can I find more tutorial about how to use this bridge?
 I also need more code examples that use this bridge. 
The documentation is not that detail.  I don't know
what many of the functions do even after I read the
documentation come with the code itself.

Many thanks.


		
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[resent]

Hi,

a URLConnection is used to connect to the frontend
(Apache).  The php instance in turn connects to our
java backend (the current vm) using the following
code:

(java_context()->getAttribute("X_JAVABRIDGE_CONTINUATION"))->call(java_closure());


Regards,
Jost Boekemeier



	

	
		
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Just out of curiosity - do you use php as a usual cgi binary, or do
you use the fastcgi interface when invoking PHP Code from Java ..

	best regards,

		Kai Londenberg

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D-30459 Hannover
Tel. +49 511 - 473 88 77
=46ax +49 511 - 473 88 78
mailto: K.L...@li...

Greetings.

I am having trouble with the installation on loading the extension. When the 
'java.so' extension load is attempted I get the following error:

Warning: dl(): Unable to load dynamic library 
'/usr/lib/php/extensions/java.so' - /usr/lib/php/extensions/java.so: 
undefined symbol: zend_ce_arrayaccess in /srv/www/htdocs/test.php on line 12

I running PHP Version 4.3.4

Any help would be appreciated. Thanks.

Hi Kevin,

> I'm attempting to set up the php-java-bridge in the
> "load balancing
> and failover" approach.  What access does Apache
> need to have to the
> .php files in my project?

It should work if you symlink the tomcat webapps
directory  into the apache document root or if you "jk
mount" it.

It's just that apache must be able to allocate and to
invoke a php instance from its pool.  


> *install warfile
> *access http://myhost/JavaBridge/numberguess.php

Yes.  If /var/www/html/JavaBridge/numberguess.php
exists.

 
> Or do I need to grant apache access to that
> directory, and map
> JavaBridge/**.php to the webcontent/JavaBridge
> directory?

jk mounting it is is also possible, but slower. When
you mount a file or directory using mod_jk, the
adapter "copies" the content of the file or directory
from the tomcat dir to the apache dir at run-time. 

So I would just symlink the
$CATALINA_HOME/webapps/JavaBridge to
/var/www/html/htdocs/.  

BTW: If you have RedHat FC4, the tomcat webapps and
the apache htdocs are shared by default, mod_jk is not
needed anymore.


Regards,
Jost Boekemeier



	

	
		
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Hi Guillaume,

> $Array = new JavaClass("java.lang.reflect.Array");
> $String = new JavaClass("java.lang.String");
> $entries = $Array->newInstance($String, 2);
[...]
> 	$req->ProcessFunction($Array);
[...]
>...(([Ljava.lang.String;)c:java.lang.reflect.Array)

if I understand this correctly, you want to pass the
created String[] instance to ProcessFunction, not the
$Array class.

Does 

  $req->ProcessFunction($entries)

solve the problem?


BTW: The above error message indicates that the
ProcessFunction2 accepts a [Ljava.Lang.String], i.e. a
String[] but it is called with an argument which is a
class java.lang.reflect.Array.  I agree that this is
difficult to read, but if I make the message more
verbose, php may cut off the rest of the message.

Maybe the full message should go to the PHP/Java
Bridge log.


Regards,
Jost Boekemeier


	

	
		
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Hi,

a number of people have asked how to invoke php
scripts from a java servlet or from a java
application.

Instead of answering these questions individually I
have created a demo. The ~4MB linux tar file can be
downloaded at

-> php-java-bridge.sf.net/php-java-bridge-3.0-demo.tar

It contains:

 * JavaBridge.jar version 3.0
 * java.so version 3.0, intel/linux 386 binary
 * php version 5.0.5, intel/linux 386 binary
 * php-script.jar (new since version 3.0)

 * HelloWorld1.java: Allocates a script from the
   build-in CGI pool using a local FileReader, calls
   the local (CGI-) php continuation and invokes php 
   script methods.

 * HelloWorld2.java: Allocates the script from 
   an external HTTP pool using a URLReader, calls
   the remote php continuation and invokes php
methods.


For older java versions (<1.6) it also contains:

 * script-api.jar ((C) by Sanka Samaranayake,
distributed under the Apache license)


Extract the php-java-bridge-3.0-demo.tar in /tmp, for
example with the command:

  cd /tmp
  tar xvf php-java-bridge-3.0-demo.tar 

And run the sample, for example with:

  sh runHello.sh

To run the second demo, move the HelloWorld.php to
your web server, make sure that the PHP/Java Bridge is
installed on this web server and check that its
php.ini contains _only_ the following entry:

[java]
# enable the http tunnel
java.servlet=On

After activating the new .ini (re-start the
web-server), you can run the second example, which is
similar to the first one except that it uses a
URLReader to allocate and to call out to a php
instance running on a remote http server.


Regards,
Jost Boekemeier

 



	

	
		
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Hello,

we're having problems passing a string array to a constructor. We construct
the array in PHP as follows :

$Array = new JavaClass("java.lang.reflect.Array");
$String = new JavaClass("java.lang.String");
$entries = $Array->newInstance($String, 2);
$entries[0] = 'hello';
$entries[1] = 'world';

and we call the constructor as follows :

try {
	$req = new javaClass('MyApp');
	$req->ProcessFunction($Array);
} catch(JavaException $ex) {
       print "$ex";
}

The error message we get is:

[o(Exception):"java.lang.Exception: Invoke failed:
[c:MyApp]->ProcessFunction2(([Ljava.lang.String;)c:java.lang.reflect.Array).
Cause: java.lang.IllegalArgumentException: argument type mismatch"]

The constructor expects a String[] parameter.

Any clues on how to create a Java String[] from PHP?

I can create Integer, Date, Vector or String objects but arrays ...

I tried:
$String = new JavaClass("java.lang.String[]"); // silly but hey, that's what
debugging is all about :)

Any help would be much appreciated.

Thanks in advance!!
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I'm attempting to set up the php-java-bridge in the "load balancing
and failover" approach.  What access does Apache need to have to the
.php files in my project?  Should I expect the following to work
unchanged?

*install warfile
*access http://myhost/JavaBridge/numberguess.php

Or do I need to grant apache access to that directory, and map
JavaBridge/**.php to the webcontent/JavaBridge directory?

-Kevin

Hi Kevin,


> I've configured the mod_jk differently

I think we can ignore mod_jk for this discussion,
because it is not essential for the PHP/Java Bridge. 
-- Unless you forward everything to tomcat, which
would render Apache, PHP and PHP/Java Bridge useless.


> Regardless of that, I'm confused about the request
> method.  The
> request is a Get request, as defined by the browser
> makeing the
> request.  Where and why would it be translated to a
> Put?

It's an internal operation of the bridge. Essentially
you have two pools, the HTTP/PHP pool (usually at :80)
and the Tomcat (JavaThread) pool (usually at tcp port
:8080). For each php instance request with java code
in it, the bridge allocates an instance from each
pool. The instances communicate using a cps style
(they pass each other's continuation). 

To make this work, the two pools must be accessible to
the bridge, of course.  "Accessible" means that they
must listen on TCP ports. (The bridge also supports
unix domain sockets for the local backend, but this
requires that you inject a JNI library called
"natcJavaBridge.so" into the java VM).


> First:  I don't want to run apache on port 80,
> surely this port isn't hardcoded anywhere?

No, of course not.


> Second:  What do you mean that "java cannot drop
> privileges"?  

Privilege dropping means that one part of the server
runs with suid rights while other parts run with lower
privileges. POSIX requires that, when a thread changes
its uid, all other threads change their id, too. After
that tomcat cannot accept connections on the
privileged port 80 anymore.


> quite possible to configure Tomcat to answer
> requests on port 80,

If one wants to expose /etc/passwd and /etc/shadow to
everyone on the internet, yes...


> Apache is running on port 8080, though, and it leads
> me to the problem I'm having.

So the apache pool listens on 8080 (I thought that's
the tomcat pool).  On which TCP port does tomcat
listen? 


Regards,
Jost Boekemeier



	

	
		
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