Outcome of :test() opeartion is different for jdk1.6 and jdk1.7. Since there is no documentation I cannot say which is correct. However behavior should be same when same configuration is used.

Calling test operation in CLI on wrong keytab:
For jdk 1.7:
/core-service=management/security-realm=KrbKeyTab/server-identity=kerberos/keytab=HTTP\/localhost:test()
{
    "outcome" => "success",
    "result" => {"subject" => "Subject:
	Principal: HTTP/localhost
	Private Credential: /home/olukas/workspace/testing/EAP6-253/krb_dir/httpwrong.keytab
"}
}

For jdk 1.6:
/core-service=management/security-realm=KrbKeyTab/server-identity=kerberos/keytab=HTTP\/localhost:test()
{
    "outcome" => "failed",
    "failure-description" => "JBAS021008: Unable to obtain Kerberos TGT",
    "rolled-back" => true
}

Please also clarify which of these outcomes is correct.