The Java Naming and Directory Interface (JNDI) Registry Service provides failover by redirecting clients to a context instance on an available server process.
Remote clients use the JNDI Registry Service of one of the server processes in the cluster through a context instance. This instance is connected to the naming system of the server process and all naming operations are performed there.
If the server fails, the JNDI Registry Service redirects naming operations to another server for processing. The redirection is transparent to clients.