Platform: Windows, Solaris
JDK: Oracle JDK7
(not reproducible on Sun's JDK6 as NTLMServer is not present there)

The com.sun.security.sasl.ntlm.NTLMServer implementaiton of method

 http://download.java.net/jdk7/docs/api/javax/security/sasl/SaslServer.html#getNegotiatedProperty%28java.lang.String%29

Does not throw specified:

Throws:
    IllegalStateException - if this authentication session has not completed

Please see the following code sample:

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package sasl;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import javax.security.sasl.SaslServerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;

public class GetAuthorizationID {

    public static void main(String[] args) throws SaslException {
        ArrayList<SaslServerFactory> list = Collections.list(Sasl.getSaslServerFactories());
        for (SaslServerFactory saslServerFactory : list) {
            System.err.println("saslServerFactory = " + saslServerFactory);
            String[] mechanismNames = saslServerFactory.getMechanismNames(null);
            if (mechanismNames.length == 1 && "NTLM".equals(mechanismNames[0])) {
                SaslServer saslServer =
                        saslServerFactory.createSaslServer("NTLM", "ldap", "abc", null, new CallbackHandler() {
                            @Override
                            public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException { }
                        });
                System.err.println("saslServer = " + saslServer);
                System.err.println("saslServer.isComplete() = " + saslServer.isComplete());
                // IllegalStateException is expected here
                saslServer.getNegotiatedProperty("prop");
                System.err.println("No IllegalStateException");
            }
        }
    }
}

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The output will look like:

saslServerFactory = com.sun.security.sasl.gsskerb.FactoryImpl@11a0d8b
saslServerFactory = com.sun.security.sasl.digest.FactoryImpl@557c15
saslServerFactory = com.sun.security.sasl.ServerFactoryImpl@ee7cee
saslServerFactory = com.sun.security.sasl.ntlm.FactoryImpl@161e946
saslServer = com.sun.security.sasl.ntlm.NTLMServer@113c652
saslServer.isComplete() = false
No IllegalStateException