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via Google Groups by Chris Haus, 2 years ago
directory '/var/opt/constellio/tomcat/webapps/ constellio/WEB-INF/constellio/collections/testsearch/data/index' exists and is a directory, but cannot be listed: list() returned null
via Oracle Community by 2791315, 1 year ago
directory '/home/oracle/Ext/Oracle/Middleware/user_projects/domains/data/lucene/0' exists and is a directory, but cannot be listed: list() returned null
java.io.IOException: directory '/var/opt/constellio/tomcat/webapps/
 constellio/WEB-INF/constellio/collections/testsearch/data/index'
 exists and is a directory, but cannot be listed: list() returned null	at org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:516)	at org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:531)