I am looking for a simple error-correction library in Java.
It needs to be able to correct some errors in variable-length messages.
However, the error-correcting codes together with the message must have a fixed-length (for transmission).

Mathematical complexity or time to decode isn't a concern.


Edit: 
I am transmitting data over sound. The errors that usually occur are single bit-errors but sometimes also larger bursts. Shifting of the entire message and Erasure of bits are not an issue.

Thanks in advance.