• * org.apache.lucene.queryParser.ParseException: Cannot parse '': Encountered "<EOF>" at line 1, column 0.
  • ​https://issues.apache.org/jira/browse/LUCENE-881
• ​http://stackoverflow.com/questions/2272908/java-io-filenotfoundexception-too-many-open-files
  • ​http://stackoverflow.com/questions/2272908/java-io-filenotfoundexception-too-many-open-files
    • Additionally the limit of open files can be altered. For example in Linux you can modify the /etc/security/limits.conf file.

lsof -p <pid of jvm>

 where pij of jvm : ps -ax: java (for antonak)

for the same pid check on /proc/6710/fd

• ​http://lucene.apache.org/java/3_0_0/api/core/org/apache/lucene/index/IndexReader.html 
  • try closing the Index Reader in DBIndex Plugin . :
  • Cannot make a static reference to the non-static method close() from the type IndexReader?
    • try closing the created object :  reader.close();