The KPROPDATA function may help. You woudl need to pass in the string that is returned from Java. KPROPDATA would remove or convert any characters found in the string that are not supported by the SAS session encoding. Because you set the ENCOIDNG to ASCIIANY, you may need to specify the input and output encoding to the function. KPROPDATA is documented in the SAS National Language Support Reference Guide.
As an alternative, if you own the Java code, you could call a method in Java that would convert to the Unicode escape representation.
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