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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