Do you have BASIC authentication turned on for Solr? Are you using a self signed SSL Certificate? Do you want to index to this server using SolrJ? Ive taken a couple of tries to get all the magic incantations to work, but finally have done it. Hopefully this saves you some of the pain I experienced in searching around StackOverflow and random blog posts.
Some of the error messages you might get are
javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated or
To sum it up, you have to fake out the certificate checking and then wrap your http call with something called Preemptive Authentication.
Here is the method, you can get it here.
To use this class just pass in your regular client and username/password combo:
By the way, the equivalent of all of this in curl is:
curl --user admin:password --insecure "https://localhost:443/solr/update/?commit=true"