so from what I understood you're running jBPM in a server and trying to load the URL from your machine (correct me if I'm wrong).
have you configured jboss to allow remote access?!
go to the standalone.xml inside jboss and set as the following:
<interface name="management">
<inet-address value="${jboss.bind.address.management:0.0.0.0}"/>
</interface>
<interface name="public">
<inet-address value="${jboss.bind.address:0.0.0.0}"/>
</interface>
Hope it helps