When I try to start up my Flux engine I receive the following error in my logs:

Communication link failure: java.io.EOFException, underlying cause: null
** BEGIN NESTED EXCEPTION **
java.io.EOFException
STACKTRACE:
java.io.EOFException, etc...

The database tables Flux is using are corrupt. Try dropping your database tables and recreating them. Flux tables can be recreated using the appropriate table creation script. Table creation scripts can be found in the doc directory in your Flux installation directory (i.e. oracle.sql).