How to use cached ticket with KerberosRestTemplate? - spring-security

Question

I want to implement integration test for my spring security kerberos authentication.
There is KerberosRestTemplate (reference) for this purpose. KerberosRestTemplate has got a default constructor with description "Leave keyTabLocation and userPrincipal empty if you want to use cached ticket".
For research i wrote a trivial class:
public static void main(String[] args) {
KerberosRestTemplate krt = new KerberosRestTemplate();
String result = krt.getForObject("http://testserver.testad.local:8080/", String.class);
System.out.println(result);
}
When i run it, exception has thrown:
Exception in thread "main" org.springframework.web.client.RestClientException: Error running rest call; nested exception is java.lang.IllegalArgumentException: Null name not allowed
at org.springframework.security.kerberos.client.KerberosRestTemplate.doExecute(KerberosRestT
emplate.java:196)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:530)
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:237)
at edu.mezlogo.Application.main(Application.java:9)
Caused by: java.lang.IllegalArgumentException: Null name not allowed
at sun.security.krb5.PrincipalName.<init>(Unknown Source)
at sun.security.krb5.PrincipalName.<init>(Unknown Source)
at javax.security.auth.kerberos.KerberosPrincipal.<init>(Unknown Source)
at javax.security.auth.kerberos.KerberosPrincipal.<init>(Unknown Source)
at org.springframework.security.kerberos.client.KerberosRestTemplate.doExecute(KerberosRestT
emplate.java:182)
... 3 more
My klist contain correct cached ticket, for my service.
#2> Client: deniz # TESTAD.LOCAL
Server: HTTP/testserver.testad.local # TESTAD.LOCAL
KerbTicket Encryption Type: RSADSI RC4-HMAC(NT)
Ticket Flags 0x40a10000 -> forwardable renewable pre_authent name_canonicalize
Start Time: 2/5/2016 6:17:39 (local)
End Time: 2/5/2016 16:16:32 (local)
Renew Time: 2/12/2016 6:16:32 (local)
Session Key Type: RSADSI RC4-HMAC(NT)
And my browser (firefox) has successful authenticated with kerberos sso.
I use Windows server 2012. And Windows 7 as client.
How to use cached ticket? (And does ktpass can generate client keytab?)
P.s. sorry for my English.

Answer 1

You are checking the Windows credentials cache - while Java is maintaining it's separate. In order to view the Java's credentials cache you should execute the klist command from your JRE/bin folder