SolrJ/Solr version mismatch error

[Sean Timm <Ti...@aol.com>]

I ran into this today it took me longer than it should have to figure 
out the problem, so I wanted to write and share my experience to save 
someone else some time.  A web search and a search through the mail 
archives didn't provide any elucidation.

If you run SolrJ 4.0.0 BETA connecting to Solr 4.0.0 (Final), you get 
the "No live SolrServers available to handle this request" error which 
doesn't provide much detail as to what is wrong.  After I got it 
working, I didn't digger deeper to see why the error was triggered 
(explicit version checking, or some difference in identifying the 
correct server), but it would have been nice to have a message 
indicating that the client and server versions don't match.

Caused by: org.apache.solr.client.solrj.SolrServerException: No live 
SolrServers available to handle this request
             at 
org.apache.solr.client.solrj.impl.LBHttpSolrServer.request(LBHttpSolrServer.java:322)
             at 
org.apache.solr.client.solrj.impl.CloudSolrServer.request(CloudSolrServer.java:237)
             at 
org.apache.solr.client.solrj.request.QueryRequest.process(QueryRequest.java:90)
             at 
org.apache.solr.client.solrj.SolrServer.query(SolrServer.java:324)
             [...]

-Sean