: https://issues.apache.org/jira/browse/SOLR-1797
that issue doesn't seem to have anything to do with the stack trace reported... : > SEVERE: java.util.concurrent.ExecutionException: : > java.lang.NoSuchMethodError: : > org.apache.solr.common.util.ConcurrentLRUCache$Stats.add(Lorg/apache/solr/c : > ommon/util/ConcurrentLRUCache$Stats;)V NoSuchMethodError means that one compiled java class expects another compiled java class to have a method that it does not actually have -- this typically happens when you have inconcsisten classfiles (or jars) in your classpath. ie: you most likely have a mix of jars from two different versions of solr/lucene. -Hoss
