[SOAP Extension] Retrieve a "java array"

Hi,

I am writing a Java SOAP Server (Axis) and a PHP5 SOAP Client. The 
return type of the webservice is an object encapsulating the response 
with the fields :
- int errCode
- String errMessage
- MyProduct product
- MyProduct[] products;
- String base64file;

So, the webservice can return a product, a collection of products in an 
array or a file encoded in base64.

Everything works fine for one product and for a file. But when I try to 
retrieve a collection, I get nothing :

$soapClient = new SoapClient($myWsdl, array('trace'=>1);
$WSResponse = $soapclient->__soapCall( "getProducts", 
array($request->getRequest()) );
/*$request->getRequest() contains the parameters for this webmethod */

$WSResponse->getProductsReturn->products->products

The returned XML looks good :

<?xml version="1.0" encoding="windows-1250"?>
<soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <soapenv:Body>
     <getProductsResponse xmlns="http://webservice.compiere.dotbase.com">
       <getProductsReturn>
         <base64file xsi:nil="true"/>
         <base64fileMimeType xsi:nil="true"/>
         <errCode>0</errCode>
         <errMessage xsi:nil="true"/>
         <invoice xsi:nil="true"/>
         <invoices xsi:nil="true"/>
         <order xsi:nil="true"/>
         <orders xsi:nil="true"/>
         <payment xsi:nil="true"/>
         <payments xsi:nil="true"/>
         <product xsi:nil="true"/>
         <products>
           <products>
             <productDescription xsi:nil="true"/>
             <productId>1000425</productId>
             <productName>xxxxxxx</productName>
             <stock>0</stock>
           </products>
           <products>
             <productDescription xsi:nil="true"/>
             <productId>1000956</productId>
             <productName>wwwwwww</productName>
             <stock>0</stock>
           </products>
.....
         </products>
         <user xsi:nil="true"/>
         <users xsi:nil="true"/>
       </getProductsReturn>
     </getProductsResponse>
   </soapenv:Body>
</soapenv:Envelope>

With the java app SoapUI, everything is OK.

Where is the problem ? A bug in the php SOAP extension ? What should I do ?

Thank you for your help
Lilian