This has been failing since fix of JDK-6977937. Please refer to the test output below:

----------System.out:(10/556)----------
Start KDC on 12541
-----------------------------------------------
>>>>> UDP packet received
RABBIT.HOLE> empty@RABBIT.HOLE sends AS-REQ for krbtgt/RABBIT.HOLE@RABBIT.HOLE, KDCOptions: FORWARDABLE,
-----------------------------------------------
>>>>> UDP packet received
RABBIT.HOLE> empty@RABBIT.HOLE sends AS-REQ for krbtgt/RABBIT.HOLE@RABBIT.HOLE, KDCOptions: FORWARDABLE,
-----------------------------------------------
>>>>> UDP packet received
RABBIT.HOLE> empty@RABBIT.HOLE sends AS-REQ for krbtgt/RABBIT.HOLE@RABBIT.HOLE, KDCOptions: FORWARDABLE,
----------System.err:(60/3879)----------
java.lang.RuntimeException: java.lang.IllegalArgumentException: EncryptionKey: Key bytes cannot be null!
at KDC.keyForUser(KDC.java:634)
at KDC.processAsReq(KDC.java:917)
at KDC.processMessage(KDC.java:646)
at KDC$1.run(KDC.java:1265)
Caused by: java.lang.IllegalArgumentException: EncryptionKey: Key bytes cannot be null!
at sun.security.krb5.EncryptionKey.<init>(java.security.jgss@9-ea/EncryptionKey.java:208)
at KDC.keyForUser(KDC.java:628)
... 3 more
java.lang.RuntimeException: java.lang.IllegalArgumentException: EncryptionKey: Key bytes cannot be null!
at KDC.keyForUser(KDC.java:634)
at KDC.processAsReq(KDC.java:917)
at KDC.processMessage(KDC.java:646)
at KDC$1.run(KDC.java:1265)
Caused by: java.lang.IllegalArgumentException: EncryptionKey: Key bytes cannot be null!
at sun.security.krb5.EncryptionKey.<init>(java.security.jgss@9-ea/EncryptionKey.java:208)
at KDC.keyForUser(KDC.java:628)
... 3 more
java.lang.RuntimeException: java.lang.IllegalArgumentException: EncryptionKey: Key bytes cannot be null!
at KDC.keyForUser(KDC.java:634)
at KDC.processAsReq(KDC.java:917)
at KDC.processMessage(KDC.java:646)
at KDC$1.run(KDC.java:1265)
Caused by: java.lang.IllegalArgumentException: EncryptionKey: Key bytes cannot be null!
at sun.security.krb5.EncryptionKey.<init>(java.security.jgss@9-ea/EncryptionKey.java:208)
at KDC.keyForUser(KDC.java:628)
... 3 more
javax.security.auth.login.LoginException: Receive timed out
at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(jdk.security.auth@9-ea/Krb5LoginModule.java:795)
at com.sun.security.auth.module.Krb5LoginModule.login(jdk.security.auth@9-ea/Krb5LoginModule.java:581)
at Context.fromUserPass(Context.java:168)
at Context.fromUserPass(Context.java:136)
at EmptyPassword.main(EmptyPassword.java:40)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-ea/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@9-ea/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:535)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(java.base@9-ea/Thread.java:843)
Caused by: java.net.SocketTimeoutException: Receive timed out
at java.net.PlainDatagramSocketImpl.receive0(java.base@9-ea/Native Method)
at java.net.AbstractPlainDatagramSocketImpl.receive(java.base@9-ea/AbstractPlainDatagramSocketImpl.java:180)
at java.net.DatagramSocket.receive(java.base@9-ea/DatagramSocket.java:814)
at sun.security.krb5.internal.UDPClient.receive(java.security.jgss@9-ea/NetClient.java:205)
at sun.security.krb5.KdcComm$KdcCommunication.run(java.security.jgss@9-ea/KdcComm.java:411)
at sun.security.krb5.KdcComm$KdcCommunication.run(java.security.jgss@9-ea/KdcComm.java:364)
at java.security.AccessController.doPrivileged(java.base@9-ea/Native Method)
at sun.security.krb5.KdcComm.send(java.security.jgss@9-ea/KdcComm.java:348)
at sun.security.krb5.KdcComm.sendIfPossible(java.security.jgss@9-ea/KdcComm.java:253)
at sun.security.krb5.KdcComm.send(java.security.jgss@9-ea/KdcComm.java:229)
at sun.security.krb5.KdcComm.send(java.security.jgss@9-ea/KdcComm.java:200)
at sun.security.krb5.KrbAsReqBuilder.send(java.security.jgss@9-ea/KrbAsReqBuilder.java:326)
at sun.security.krb5.KrbAsReqBuilder.action(java.security.jgss@9-ea/KrbAsReqBuilder.java:371)
at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(jdk.security.auth@9-ea/Krb5LoginModule.java:753)
... 10 more