gpg: failed to create temporary file

[Michel Messerschmidt]

> One last test: Rather than having BPEL run "gpg" directly, perhaps you
> could have it run a shell script that in turn runs "gpg". You should then
> be able to set whatever variables you need prior to the call of gpg from
> within the shell script. You can also enable tracing (set -o xtrace) to
> help with script
> debugging.

Or try to debug your oracle environment with env_audit
(http://www.web-insights.net/env_audit/)