Re: [Php-java-bridge-users] Question regarding the PHP/Java bridge

Hi,

> I am short on time right now to sort out the PUT
> permission. I'll take

Just deinstall mod_jk and it should work.

> to re-configure PHP
> to support PUT requests.

Not really. Tomcat and the PHPJavaServlet do support put, get and post requests. However, when mod_jk is installed, which is a deprecated method to connect apache with tomcat, the back end denies PUT requests in order to disallow internet clients to modify the web content.


> java-related code; where the php based front end calls a
> JAVA based backend.

You have two options: either start the built-in servlet engine with java -jar JavaBridge.jar or use a real servlet engine, for example tomcat, jetty, Oracle, IBM WebSphere, ...


[the other way 'round...]
> - I have an existing PHP based application, both backend
> and frontend.
> - I want to create a JAVA based front end that can talk to
> the PHP based
> backend

That's trivial, if you use the JSR 223 API.

For example:

  jrunscript -classpath JavaBridge.jar -l php-interactive
  > function toString() {return "hello Java, I am PHP";}
  > echo java_closure();
  => hello Java, I am PHP

[to run the above example make sure that JavaBridge.jar and php-script.jar
is in the current working directory and that jre/lib/ext does not contain
JavaBridge.jar and php-script.jar -- Java doesn't have a module system, please
see our README section Java Platform Issues for details. Use .NET or Mono if you 
don't like how Java works around that problem... ]

> * Copied the created "JavaBridge.jar" and
> "php-script.jar" from the
> "ext" folder to the J2SE library path
> (specifically the 'jre/lib/ext'
> directory)

Right.


> * opened Netbeans IDE
[...]
> public class HelloWorld {
> 
>     public static void main(String[] args) {
> 
>     String l = "3";
>    
> System.setProperty("php.java.bridge.default_log_level",
> l);
>    
> System.setProperty("php.java.bridge.default_log_file",
> "");
>    
> System.setProperty("php.java.bridge.php_exec",
> "php-cgi");
> 
>     try {
>         InvocablePhpScriptEngine engine = new
> InvocablePhpScriptEngine();
>         String s = "<?php
> extension_loaded('java')||@dl('java.so')||@dl('php_java.dll');
> echo
> 'HelloWorld!\n';
> java_context()->call(java_closure())
>         ||die('oops!');?>";
> 
>         engine.eval(new StringReader(s));
>         String name = (String)
> ((Invocable)engine).invokeFunction("java_get_server_name",
> new Object[]{});
>         System.out.println("PHP/Java communication
> port: " + name);
> 
>         }
> 
>         //engine.release();
>         engine.eval((Reader)null);
> 
>     } catch (Exception e) {
>         e.printStackTrace();
>     }
>   }
> }

> * Compiled the code, which went fine


The above example contains a try/catch statement with two closing braces. Either netbeans is a really bad programming editor or the above example is not the code you've tested.

I fixed the error and ran the following code in eclipse:

package test;

import java.io.Reader;
import java.io.StringReader;

import javax.script.Invocable;

import php.java.script.InvocablePhpScriptEngine;

public class HelloWorld {

    public static void main(String[] args) {

    String l = "3";
    System.setProperty("php.java.bridge.default_log_level", l);
    System.setProperty("php.java.bridge.default_log_file", "");
    System.setProperty("php.java.bridge.php_exec", "php-cgi");

    try {
        InvocablePhpScriptEngine engine = new InvocablePhpScriptEngine();
        String s = "<?php echo 'HelloWorld!\n'; ?>";

        engine.eval(new StringReader(s));
        String name = (String)
((Invocable)engine).invokeFunction("java_get_server_name", new Object[]{});
        System.out.println("PHP/Java communication port: " + name);

        engine.eval((Reader)null);

    } catch (Exception e) {
        e.printStackTrace();
    }
  }
}

The result:

PHP/Java communication port: 127.0.0.1:9267
HelloWorld!


> java.lang.NullPointerException

The null pointer exception is because the eval failed. Or eval has never been called. 


Regards,
Jost Boekemeier


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