Re: [Php-java-bridge-users] Confused about handling RuntimeExceptions

Hi,

In PHP/Java Bridge version 5.4.4.2 you can use the option
JAVA_PREFER_VALUES:

Download version 5.4.4.2, for example:
http://downloads.sourceforge.net/project/php-java-bridge/Binary%20package/php-java-bridge_5.4.4.2/JavaBridge.jar?use_mirror=dfn

Type java -jar JavaBridge.jar --version
-> 5.4.4.2

Type java -jar JavaBridge.jar SERVLET_LOCAL:8081 3 ""

Type php -n -dallow_url_include=On test.php

Test.php:

<?php
define ("JAVA_PREFER_VALUES", true);
require_once("http://localhost:8081/JavaBridge/java/Java.inc");

java_require("foo.jar");
try {
java("Foo")->call(false);
java("Foo")->call(true);
java("Foo")->call(false);
} catch (JavaException $e) {
  echo $e;
  }
?>

Foo.java:
public class Foo {
    public static void call(boolean b) {
if (b) throw new RuntimeException("bleh!");
    }
}

Please note that the option JAVA_PREFER_VALUES kills performance as it
checks for an exception after each call (I.e. each java call generates a
full network round-trip).
I have tested this against PHP/Java Bridge version 5.4.4.2. In 5.5.2 this
option doesn't work anymore (we'll re-enable it in a later 5.5 release).

However, I think it is better to handle unchecked exceptions in your own
Java class.

Regards,
Jost Boekemeier

On Sep 23, 2009 8:30 PM, <php...@li...>
wrote:

Hi,

I'm in the process of evaluating the PHP/Java Bridge.  My company wants to
use it to leverage an existing set of data model classes we have created
using Hibernate.  I've successfully set up a test that is working fine, but
I've come across something I'm concerned and a bit confused about and was
hoping the list could help me.

I've read the FAQ entry which states that all exceptions crossing the
boundary must be declared, as well as a thread in the mailing list archives
here:
http://sourceforge.net/mailarchive/message.php?msg_id=3921.39923.qm%40web505
08.mail.re2.yahoo.com

My concern is that this will prevent us from using the bridge in the way we
have envisioned, so I'm asking for advice on how to handle it.

We want to be able to perform arbitrary operations on our data model classes
within the scope of a Hibernate transaction, using a pattern like the
following:

$factory = getSessionFactory(); //Hibernate session factory
try {

 $factory->getCurrentSession()->beginTransaction();

 //arbitrary code here

 $factory->getCurrentSession()->getTransaction()->commit();

} catch (JavaException $ex) {
 $factory->getCurrentSession()->getTransaction()->rollback();
 throw $ex;
}

My concern is that there are several places within the arbitrary code
sections where we are calling methods that throw unchecked exceptions that
subclass RuntimeException.  Most of our exceptions will occur during the
commit, but not all of them.

Is our approach even feasible with the bridge?  We do not want to have to
declare "throws RuntimeException" on hundreds of methods in our data model
classes.  Is there some other approach we could take, perhaps passing our
arbitrary code as a closure to the java side and having a top level handler
for all exceptions on the java side of things?

I apologize if I am misunderstanding anything.  I have been programming Java
for a couple of years but so far I've only used basic servlets, no JEE
containers or anything more complicated so I'm basically looking for
guidance.

Thanks in advance!

Michael Sims


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