Reliability of Java, sockets and TCP transmissions

I am writing client and server components of an application that communicate using Socket, ServerSocket and TCP. I would like to know just how reliable this connection/protocol combination is in terms of transmission errors. So far I have only been able to run the application where the client and server are on the same local machine or separated by an intranet/LAN so I have no results of an internet deployment to report but I have not encountered any IO errors to this point.

So just how reliable are TCP and Java sockets over the actual internet? I mean do I need to implement some kind of "advanced" protocol whereby check sums are transmitted along with packets and the packet retransmitted if the check sum is invalid or is all this handled by either the Java sockets or the TCP protocol already?

--
And loving it,

-Q
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