Solrj IOException occured when talking to server

Question

I am using basic authentication. My solr version is 4.1. I can get query results but when I try to index documents I am getting the following error message:

org.apache.solr.client.solrj.SolrServerException: IOException occured when talking to server at: http://192.168.0.1:8983/solr/my_core
    at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:416)
    at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:181)
    at org.apache.solr.client.solrj.request.AbstractUpdateRequest.process(AbstractUpdateRequest.java:117)
    at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:116)
    at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:102)
    at warningletter.Process.run(Process.java:128)
    at warningletter.WarningLetter.parseListPage(WarningLetter.java:81)
    at warningletter.WarningLetter.init(WarningLetter.java:47)
    at warningletter.WarningLetter.main(WarningLetter.java:21)
Caused by: org.apache.http.client.ClientProtocolException
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:822)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:732)
    at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:353)
    ... 8 more
Caused by: org.apache.http.client.NonRepeatableRequestException: Cannot retry request with a non-repeatable request entity.
    at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:625)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:464)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
    ... 11 more

This is my code piece:

DefaultHttpClient httpclient = new DefaultHttpClient();
httpclient.getCredentialsProvider().setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("user", "password"));
HttpSolrServer server = new HttpSolrServer("http://192.168.0.1:8983/solr/warning_letter/", httpclient);
SolrInputDocument solrDoc = new SolrInputDocument();
solrDoc.addField("id", "id1");
solrDoc.addField("letter", "letter");
server.add(solrDoc);
server.commit();

What am I doing wrong?

Answer 1

The trick is to use the preemptive authentication so as to avoid the need to repeat the query after the "unauthorized" response is sent. Here is the example Preemptive Basic authentication with Apache HttpClient 4