Occasionally, Java will take an WebSphere Application Server for z/OS error code (C9C2xxxx in hexadecimal) and convert it to a very large negative number. If you get a very large negative number, try converting it back to hexadecimal to find the correct code.
To convert the error codes back to hexadecimal:
bc
Example: Suppose you get the error code "910022649":
bc
obase=16 2^32 - 910022649 quit