[jira] [Created] (SOLR-6504) Switching exploded war from version 4.10 caused Solr to be unable to start

["Brian (JIRA)" <ji...@apache.org>]

Brian created SOLR-6504:
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             Summary: Switching exploded war from version 4.10 caused Solr to be unable to start
                 Key: SOLR-6504
                 URL: https://issues.apache.org/jira/browse/SOLR-6504
             Project: Solr
          Issue Type: Bug
            Reporter: Brian
            Priority: Minor


I tried upgrading to Solr 4.10 from Solr 4.8.1 by switching the server to use the new Solr 4.10 web application folder (exploded war) - simply by renaming the folder from "solr_4_10" to "solr" (and the previous "solr" to "solr_old"), then restarting the server.

This worked fine, but there was an incompatibility forcing me to switch back to 4.8.1, which I did by renaming the folders again, "solr_old" back to "solr" and restarting the server.  

However on restart, none of the cores could load, giving the following error:
    org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: java.util.ArrayList cannot be cast to java.util.Map

By searching I found the previous issue (linked to below), and found this was the same problem - "_rest_managed.json" files were being created, and once I deleted them that particular error message went away and most cores could be loaded.

I.e., this appears to be the same issue as:

https://issues.apache.org/jira/browse/SOLR-6182
 
except it is caused by a different process.  Either that issue wasn't really resolved, or this is a different problem with the same symptoms.



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