I try to implement Spring Security with OpenID in Google App Engine but I am getting a \'java.security.AccessControlException: access denied\' for the RequestURI /j_spring_o
Idea 1 - look at the exception stacktrace to try to figure out whar is going on.
Idea 2 - ask on the SpringSecurity forum and/or submit a bug report.
I'd also note that lots of Java code breaks when you run things in a Java security sandbox. The normal use-case for SpringSecurity is to run in a J2EE container (e.g. a servlet) without sandboxing. What you are doing sounds ... um ... different.