Apache Abdera Client giving No credentials available for NTLM <any realm>#proxy.tcs.com:8080 - httpclient

Question

I have seen many forum posts for this and tried several suggestions but still I am not able to solve this. The code works good at my home system, but behind the organization firewall it gives a exception message :
No credentials available for NTLM #proxy.tcs.com:8080
Here is the method which I am using
private static void UseAbdera() throws IOException
{
try
{
Abdera abdera = new Abdera();
AbderaClient client = new AbderaClient(abdera);
client.setProxy("OrgProxyHost", 8080);
NTLMAuthenticatorClass authenticator = new NTLMAuthenticatorClass("username", "password");
Authenticator.setDefault(authenticator);
NTCredentials ntcr = new NTCredentials("username", "password", "greenhouse.lotus.com", "India.TCS.com");
client.addCredentials("https://greenhouse.lotus.com", null, null, ntcr);
ClientResponse resp = client.get("https://greenhouse.lotus.com/forums/atom/service");
org.apache.abdera.model.Document<org.apache.abdera.model.Service> service_doc = resp.getDocument();
service_doc.writeTo(System.out);
System.out.println("\n");
org.apache.abdera.model.Service service = service_doc.getRoot();
org.apache.abdera.model.Collection collection = service.getCollection("Forums Feed Collection", "My Topics");
String coll_uri = collection.getResolvedHref().toASCIIString();
org.apache.abdera.model.Entry entry = abdera.newEntry();
entry.setTitle("TEST REPLY !");
// Mark private
resp = client.post(coll_uri, entry);
switch (resp.getType())
{
case SUCCESS:
String location = resp.getLocation().toASCIIString();
System.out.println("New entry created at: " + location);
break;
default:
System.out.println("Error: " + resp.getStatusText());
}
} catch (URISyntaxException ex)
{
Logger.getLogger(IBMConnectionMessages_ForumPractice.class.getName()).log(Level.SEVERE, null, ex);
}
}
This is the exception log I get
org.apache.commons.httpclient.auth.AuthChallengeProcessor selectAuthScheme
INFO: ntlm authentication scheme selected
Jul 6, 2012 10:42:03 AM org.apache.commons.httpclient.HttpMethodDirector processProxyAuthChallenge
INFO: No credentials available for NTLM #orgProxyHost:8080
Exception in thread "main" java.lang.IllegalStateException
at org.apache.abdera.protocol.client.CommonsResponse.(CommonsResponse.java:44)
at org.apache.abdera.protocol.client.AbderaClient.execute(AbderaClient.java:692)
at org.apache.abdera.protocol.client.AbderaClient.get(AbderaClient.java:216)
at org.apache.abdera.protocol.client.AbderaClient.get(AbderaClient.java:404)
at IBMConnectionMessages_ForumPractice.UseAbdera(IBMConnectionMessages_ForumPractice.java:231)
at IBMConnectionMessages_ForumPractice.main(IBMConnectionMessages_ForumPractice.java:45)
Please help, I have spent half a day on it.

Answer 1

your proxy may need ntlm authentication, so provide your proxy authentication details as NTCredentials while setting proxy credentials.