Writes a signed sbyte (8-bit signed integer with values ranging from negative 128 to positive 127) to the bytes message stream as a 1-byte value. 
sbyte value to be written| Exception Type | Condition | 
|---|---|
| MessageException | if JMS fails to write the message due to some internal error. | 
| MessageNotWriteableException | if the message is in read-only mode. | 
IBytesMessage Interface | WebLogic.Messaging Namespace