Sequence Generator on a non ID field

[David Beer]

Hi all

I am trying to get a value for a field set when commited to the db, to
be auto generated. This field is not an ID for the table. I seem to get
the error message "InvalidStateException: Can only perform operation
while a transaction is active."

My class looks like the following:

@GeneratedValue(strategy = GenerationType.TABLE, generator = "UserGen")
@TableGenerator(name = "UserGen", table = "USER_GEN", pkColumnName =
"PK", valueColumnName = "USERID")
private Long userID;

Any Thoughts.

Thanks

David