I got this to work as follows (but there's a twist when dealing with Eclipse from Windows):   System.setProperty("javax.net.ssl.trustStorePassword","xxxxxx"); System.setProperty("java.security.auth.login.config", "C:\\my_jaas.conf"); String zkHosts = "zookeeper1.com:2181,zookeeper2.ghp.com:2181,zookeeper3.ghp.com:2181/solr"; Krb5HttpClientBuilder krbBuild = new Krb5HttpClientBuilder(); SolrHttpClientBuilder kb = krbBuild.getBuilder(); HttpClientUtil.setHttpClientBuilder(kb); CloudSolrClient solrServer = new CloudSolrClient.Builder().withZkHost(zkHosts).build(); String collectionName = "test_col"; solrServer.setDefaultCollection(collectionName); solrServer.connect(); SolrQuery parameters = new SolrQuery(); parameters.set("q", "*:*"); try { solrServer.commit(); QueryResponse response = solrServer.query(parameters); for (SolrDocument solrDocument : response.getResults()) { System.out.println(" " + solrDocument.toString()); } krbBuild.close(); solrServer.close(); } catch (SolrServerException | IOException e) { e.printStackTrace(); }   If you are working from a Windows Environment and Windows is generating your TGT Kerberos keys and Kerberos is hooked into AD (that is, not using MIT Kerberos), then you need to update the registry as follows (thanks to Cloudera Systems Engineer Tom Roach):   On windows, to use your kerberos tickets from AD in your Java program, you need to setup this Windows registry.   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters Value Name: AllowTgtSessionKey Value Type: REG_DWORD Value: 0x01   jaas.conf: Client { com.sun.security.auth.module.Krb5LoginModule required useKeyTab=false useTicketCache=true principal="myuser@MYDOMAIN.COM"; }; ... View more