Php support for Java

In an app I'm developing I have a need to call java classes, and am hoping to use PHP's java integration. However, the manual page (http://www.php.net/manual/en/ref.java.php) says "This extension is EXPERIMENTAL. The behaviour of this extension -- including the names of its functions and anything else documented about this extension -- may change without notice in a future release of PHP. Use this extension at your own risk." My question is, how EXPERIMENTAL is it? Anyone using it in a production system? Have any problems yet? I may be willing to risk it, but wanted to hear "lessons learned" from others on the list. Thanks, John