Release 10.1A: OpenEdge Development:
Web Services

> ## Progress 4GL unknown values

> The Unknown value (`?`) appears as a `null` value in Java. For any Progress user-defined function that returns the Unknown value (`?`) as a primitive Java data type, this raises an exception in the interface method that calls this function. The client must compensate for this by catching the exception, as follows:

>     catch (NullPointerException con)
>     {
>         System.err.println("The total Orders are: 0 (unknown)");
>     }

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