Hi,

If the initial request doesn't contain the Authentification header, a
NullPointerException is raised.

java.lang.NullPointerException
        at
org.restlet.ext.jaas.ChallengeCallbackHandler.handle(ChallengeCallbackHandler.java:101)
        at
org.restlet.ext.jaas.ChallengeCallbackHandler.handle(ChallengeCallbackHandler.java:124)
        at
javax.security.auth.login.LoginContext$SecureCallbackHandler$1.run(LoginContext.java:955)

...

        if (callback instanceof javax.security.auth.callback.NameCallback) {
            javax.security.auth.callback.NameCallback nc =
(javax.security.auth.callback.NameCallback) callback;
            nc.setName(getRequest().getChallengeResponse().getIdentifier());
        } else

The ChallengeResponse is probably null.
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