Release 10.1A: OpenEdge Development:
Java Open Clients

> ## Creating variables for parameters

> Before passing a parameter, you must create a variable of the correct Java data type. If you want to pass the Progress Unknown value (`?`) (`null` in Java) for intrinsic types, you must use the corresponding object. The Progress to Java mappings are the same as the ones defined for passing parameters to Open Client proxy methods. For more information on the supported mappings between Progress 4GL and Java data types, see Chapter 4, " Passing Parameters."

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