In Memcached server, make sure full line is read before sending errors to clients.

i.e. If you send this:

$ export KEY300=<key with length 300 chars>
$ echo -e "add $KEY300 0 0 1\r\nget a\r" | nc localhost 11212

The first command should be considered an error but the second part should be consumed without problems.

Original Memcached server would return:
CLIENT_ERROR bad command line format
END

Whereas Infinispan one returns this and the GET is ignored:
CLIENT_ERROR org.infinispan.server.core.ServerException: java.io.IOException: Key length over the 250 character limit

More info in linked JBPAPP issue.