stack level too deep

[e2]

I get the following on Ubuntu AMD64:

$ RUBYOPT="--debug" rake spec

/home/me/.rvm/gems/jruby-1.5.1/gems/jruby-prof-0.1.0/lib/jruby-prof/invocation_set.rb:30:in add_methods': stack level too deep (SystemStackError) from /home/me/.rvm/rubies/jruby-1.5.1/lib/ruby/site_ruby/shared/builtin/java/java.util.rb:21:incall'
from /home/me/.rvm/rubies/jruby-1.5.1/lib/ruby/site_ruby/shared/builtin/java/java.util.rb:21:in each' from /home/me/.rvm/gems/jruby-1.5.1/gems/jruby-prof-0.1.0/lib/jruby-prof/invocation_set.rb:29:inadd_methods'
from /home/me/.rvm/gems/jruby-1.5.1/gems/jruby-prof-0.1.0/lib/jruby-prof/invocation_set.rb:30:in add_methods' from /home/me/.rvm/rubies/jruby-1.5.1/lib/ruby/site_ruby/shared/builtin/java/java.util.rb:21:incall'
from /home/me/.rvm/rubies/jruby-1.5.1/lib/ruby/site_ruby/shared/builtin/java/java.util.rb:21:in each' from /home/me/.rvm/gems/jruby-1.5.1/gems/jruby-prof-0.1.0/lib/jruby-prof/invocation_set.rb:29:inadd_methods'
from /home/me/.rvm/gems/jruby-1.5.1/gems/jruby-prof-0.1.0/lib/jruby-prof/invocation_set.rb:30:in `add_methods'
... 28 levels...
from /home/media/backup/other/gems/.rvm/gems/jruby-1.5.1/gems/rake-0.8.7/bin/rake:41

jruby 1.5.1 (ruby 1.8.7 patchlevel 249) (2010-06-06 f3a3480) (OpenJDK 64-Bit Server VM 1.6.0_18) [amd64-java]

Let me know if there is anything I can do to help track down the cause.

Thanks!