Grails functional tests failing due to VerifyError loading classes

Caused by: java.lang.VerifyError: (class: org/jsecurity/grails/RealmWrapper, method: isPermitted signature: (Lorg/jsecurity/subject/PrincipalCollection;Ljava/util/List;)[Z) Expecting to find object/array on stack
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:169)
	at JsecurityGrailsPlugin$_closure7.class$(JsecurityGrailsPlugin.groovy)
	at JsecurityGrailsPlugin$_closure7.$get$$class$org$jsecurity$grails$RealmWrapper(JsecurityGrailsPlugin.groovy)
	at JsecurityGrailsPlugin$_closure7.doCall(JsecurityGrailsPlugin.groovy:338)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272)
	at groovy.lang.MetaClassImpl.invokePropertyOrMissing(MetaClassImpl.java:1093)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1056)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:884)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:704)
	at Jsec

       def wrapperName = "${realmName}Wrapper".toString()
        "${wrapperName}"(RealmWrapper) {
            realm = ref("${realmName}Instance")
            tokenClass = GrailsClassUtils.getStaticPropertyValue(grailsClass.clazz, 'authTokenClass')
        }