How to access kerberos SPNEGO authenticated resource using spring rest template
<p>I am running into issues while trying to access kerberos SPNEGO  authenticated resource using spring rest client. I am using <code>KerberosRestTemplate</code>.</p>

<p>From the docs </p>

<blockquote>
  <p>Leave <code>keyTabLocation</code> and <code>userPrincipal</code> empty if you want to use cached ticket.</p>
</blockquote>

<p>But while I try with invoking the parameterless constructor </p>

<pre><code>this.kerberosRestTemplate = new KerberosRestTemplate();
</code></pre>

<p>And try to access to the protected resource it fails with the following error:</p>

<pre><code>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(KerberosRestTemplate.java:196) 
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:538) 
    at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:245) 
Caused by: java.lang.IllegalArgumentException: Null name not allowed
        at sun.security.krb5.PrincipalName.&lt;init&gt;(PrincipalName.java:356) ~[?:1.7.0_67]
        at javax.security.auth.kerberos.KerberosPrincipal.&lt;init&gt;(KerberosPrincipal.java:123) ~[?:1.7.0_67]
        at org.springframework.security.kerberos.client.KerberosRestTemplate.doExecute(KerberosRestTemplate.java:182)
</code></pre>

<p>What am I doing wrong here? </p>