Out of memory error

We are encountering these error in our logs. Could someone out there have experience the following before ?

1. 2016.02.22 06:07:19 org.jivesoftware.openfire.nio.ConnectionHandler - Closing connection due to exception in session:

(0x0005644B: nio socket, server, null => 0.0.0.0/0.0.0.0:5222)

1. java.lang.OutOfMemoryError: GC overhead limit exceeded