Fatal error: php_mod_java(98): Call object is null: The connection to the current back end doesn't exist anymore; probably the current back end has been restarted w/o restarting the front end. in /var/www/vladahr/extension/lucene/search/plugins/lucene/lucene.php on line 554
Fatal error: eZ publish did not finish its request

The execution of eZ publish was abruptly ended, the debug output is present below.