Clojure 1.2.1/1.3/1.4 ‘proxy generated in Grails 2.0.0 runtime fails. 1.2.0 is fine

I found an Issue called CLJ-944 on clojure.org. There you can find a fix for ClassCastException: clojure.lang.PersistentArrayMap cannot be cast to java.lang.Class issue

The problem is:

that the compiler injects an incorrect cast to
clojure.lang.PersistentHashMap. In this case it should probably be
cast to a clojure.lang.Associative, the highest common interface
having the .containsKey method.

Patch 1 – 0001-Fix-for-CLJ-944.patch

Patch 2 – 0002-Fix-for-CLJ-944.patch

I hope it helps.