I'm trying to do a Google App Engine project on OS X (latest and greatest). I'm using classes from javax.crypto, and I'm seeing an AccessControlException thrown when I try to initialize an instance of the Mac class. Here's the stack trace:

WARNING: Nested in java.lang.ExceptionInInitializerError:
java.security.AccessControlException: access denied (java.lang.RuntimePermission loadLibrary.keychain)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:264)
    at java.security.AccessController.checkPermission(AccessController.java:427)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:76)
    at java.lang.SecurityManager.checkLink(SecurityManager.java:818)
    at java.lang.Runtime.loadLibrary0(Runtime.java:816)
    at java.lang.System.loadLibrary(System.java:993)
    at com.apple.crypto.provider.HmacCore.<clinit>(HmacCore.java:26)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
    at java.lang.Class.newInstance0(Class.java:350)
    at java.lang.Class.newInstance(Class.java:303)
    at java.security.Provider$Service.newInstance(Provider.java:1130)
    at javax.crypto.Mac.a(DashoA12275)
    at javax.crypto.Mac.init(DashoA12275)

Any ideas on

1 - what went wrong and how fix it

2 - if it's not fixable (I know Apple has not been the best supporter of Java in recent years), what's an alternative approach?