I am also getting the same error popup while deploying the Jersey based Rest web services on
JBoss AS 7.1.1 / JDK 1.6.
It used to work fine when I was working on another machine with JDK 1.7.
Service is deployed on JBoss AS but the client or invocation on the Explorer throws this popup
@Frits : Cant change to any other server like Glassfish