(from github.com/festersearch)
My disk space ran out while fess was running. I have since cleaned things up (nothing to do with fess) and have plenty of disk space.
When I start fess, and try and visit the web app (either the main app, or the admin page). I get 404 errors in the browser, and lots of “java.lang.NoClassDefFoundError: org/elasticsearch/index/IndexService$2” errors in the fess logs.
For example:
Exception in thread "elasticsearch[Node 1][management][T#5]" java.lang.NoClassDefFoundError: org/elasticsearch/index/IndexService$2
at org.elasticsearch.index.IndexService.sync(IndexService.java:801)
at org.elasticsearch.index.IndexService.syncRetentionLeases(IndexService.java:794)
at org.elasticsearch.index.IndexService.access$800(IndexService.java:99)
at org.elasticsearch.index.IndexService$AsyncRetentionLeaseSyncTask.runInternal(IndexService.java:975)
at org.elasticsearch.common.util.concurrent.AbstractAsyncTask.run(AbstractAsyncTask.java:141)
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:681)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:835)