RE: [openjms-user] How unique is MessageID in OpenJMS ?

[Tim A. <tm...@ne...>]

> From: ope...@li...
> [mailto:ope...@li...]On Behalf Of George
> Mullen
> 
> I too prefer method [2] based on the ip address and java.rmi.server.UID.
> However a couple of point to bear in mind 
> i) the IP address may default to loopback 127.0.0.1 if the java code is
> untrusted. This can happen in the case of unsigned applets or servier
> side code running in third part containers which have local java
> security policies.

True - I don't know of any easy workaround in this case. 
If a client can't determine its host, it could always be assigned
a unique id from the server, and concatenate the UID to that.

> 
> ii) It is possible to get an ID collision if the UID class is loaded
> into different classloaders running on the same host e.g separate jvm
> processes, different web apps in Tomcat, different SAR in Phoenix. 

I don't know if this can happen, as the UID class is loaded by the JVM.

> 
> Regards
> George