[Php-java-bridge-users] Help Call to a member function getSimpleName() on a non-object in /var/www/

i am trying to listen some listener from java(asterisk api to listen
events) in php. i run the php program its working  and catches some events
but after few minute it will exit abnormally.

*my source code<?php
ini_set("dallow_url_include","On");
require_once("http://localhost:8087/JavaBridge/java/Java.inc");

class Listener
{

   function onManagerEvent($managerEvent)
 {
    try{

        $str="HangupEvent";
        $str2="DialEvent";
        $str1=trim($managerEvent->getClass()->getSimpleName());

        if(java_cast($str1,"string")==$str)
        {
         $hang_up_event= new
java("org.enjaysynapse.manager.event.HangupEvent");
             $hang_up_event=$managerEvent;
         $number=java_cast($hang_up_event->getCallerIdNum(),"string");

 $received_date=java_cast($hang_up_event->getDateReceived(),"string");
          $unique_id=java_cast($hang_up_event->getUniqueId(),"string");
         echo "HangupEvent Number=".$number."\tCallReceived
Date=".$received_date."\tUniqueId=".$unique_id."\n";
        }

        if(java_cast($str1,"string")==$str2)
        {
         $Dail_event= new java("org.enjaysynapse.manager.event.DialEvent");
             $Dail_event=$managerEvent;
         $number=java_cast($Dail_event->getCallerIdNum(),"string");
         $received_date=java_cast($Dail_event->getDateReceived(),"string");
          $unique_id=java_cast($Dail_event->getUniqueId(),"string");
         $scr_channel=java_cast($Dail_event->getChannel(),"string");
         $destination=java_cast($Dail_event->getDestination(),"string");
         echo "DialEvent
Number=".$number."\tDestination=".$destination."\tCallReceived
Date=".$received_date."\tUniqueId=".$unique_id."\tSRC=".$scr_channel."\n";
        }

        }
        catch(JavaException $e){
        echo "list.php onManagerEvent---error---->".$e;
        }


 }

}
     function getListener()
     {
    try{
         return java_closure(new Listener(), null, array(new
Java("org.enjaysynapse.manager.ManagerEventListener")));
    }
catch(JavaException $e){
    echo "list.php getListener---error---->".$e;
    }
     }
?>*

*Error :-*

*Fatal error:* Call to a member function getSimpleName() on a non-object in
/var/www/list.php on line 14

Notice: Uninitialized string offset: 6 in
http://localhost:8087/JavaBridge/java/Java.inc on line 786

Fatal error: An unchecked exception occured during script execution. Please
check the server log files for details. in
http://localhost:8087/JavaBridge/java/Java.inc on line 776