AccessControlException exception on GAE with Grails

Hi!

I was doing the following:

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export CLASSPATH=""
grails create-app MyApp
cd MyApp
grails install-plugin app-engine
(choosing jdo)
grails uninstall-plugin tomcat
grails set-version 1
grails install-plugin shiro
grails quick-start
grails app-engine package
$APPENGINE_SDK/bin/appcfg.sh update target/war

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I use the following Version:
grails 1.2.0
app-engine plugin 0.8.8
shiro plugin 1.0.1
appengine java SDK 1.3.0

Checking the app engine Logs gives me the following exception and stacktrace:

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javax.servlet.ServletContext log: Initializing Spring root WebApplicationContext
[Runtime Network Thread] ERROR servlet.AbstractFilter - Unable to start Filter: [access denied
(java.lang.RuntimePermission getClassLoader)].
java.security.AccessControlException: access denied (java.lang.RuntimePermission getClassLoader)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:355)
at java.security.AccessController.checkPermission(AccessController.java:567)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at
com.google.apphosting.runtime.security.CustomSecurityManager.checkPermission(CustomSecurityManager.java:45)
at java.lang.ClassLoader.getSystemClassLoader(Unknown Source)
at org.apache.shiro.util.ClassUtils.getResourceAsStream(ClassUtils.java:73)
at org.apache.shiro.io.ResourceUtils.loadFromClassPath(ResourceUtils.java:158)
at org.apache.shiro.io.ResourceUtils.getInputStreamForPath(ResourceUtils.java:122)
at org.apache.shiro.io.ResourceUtils.resourceExists(ResourceUtils.java:92)
at org.apache.shiro.config.IniConfiguration.init(IniConfiguration.java:101)
at org.apache.shiro.spring.SpringIniWebConfiguration.init(SpringIniWebConfiguration.java:96)
at org.apache.shiro.util.LifecycleUtils.init(LifecycleUtils.java:47)
at org.apache.shiro.util.LifecycleUtils.init(LifecycleUtils.java:41)
at org.apache.shiro.web.servlet.ShiroFilter.configure(ShiroFilter.java:353)
at org.apache.shiro.web.servlet.ShiroFilter.onFilterConfigSet(ShiroFilter.java:287)
at org.apache.shiro.web.servlet.AbstractFilter.init(AbstractFilter.java:94)
at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:99)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:589)
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After putting

debug 'org.apache.shiro.io'

into the log-section of Config.groovy I get the additional log line:

[Runtime Network Thread] DEBUG io.ResourceUtils - Opening resource from class path [shiro.ini]

just before the error.