Export parameter in Message mapping UDF

Question

Hi, I use PI7.1.
I defined an Export parameter in Message mapping "Signature" tab.
And as http://help.sap.com/saphelp_nwpi71/helpdata/en/43/c3e1fa6c31599ee10000000a1553f6/frameset.htm,
I wrote in my UDF as follows:
public String myudf(int var1) {
String str="test";
if(exists("MY_PARA") == true) {
getOutputParameters.setString("MY_PARA", str);
  return str;
However when I ran the test, it said there is "syntax error".
I guess the reason is not found the method exitst() or getOutputParameters. Anybody can help? thanks

Answer 1

Here is a valid sample for a Java Mapping program working with Parameterized Mappings - taken from help.sap.com::
import com.sap.aii.mapping.api.AbstractTransformation;
import com.sap.aii.mapping.api.StreamTransformationException;
import com.sap.aii.mapping.api.TransformationInput;
import com.sap.aii.mapping.api.TransformationOutput;
import com.sap.aii.mapping.lookup.Channel;
public class Parametrization_Java
   extends AbstractTransformation {
      public void transform(
         TransformationInput in,
         TransformationOutput out)
      throws StreamTransformationException {
         try {
// Read Import Parameters
            String paramS =
               in.getInputParameters().getString(u201CPARAM_Su201D);
            int paramI =
               in.getInputParameters().getInt(u201CPARAM_Iu201D);
            Channel paramC =
               in.getInputParameters().getChannel(u201CPARAM_Cu201D);
// Use Parameters during Mapping
// Set Export Parameters
               out.getOutputParameters()
                  .setString(u201CPARAM_ESu201D, [String-Wert]);
               out.getOutputParameters()
                  .setInt(u201CPARAM_EIu201D, [Integer-Wert]);
               out.getOutputParameters()
                  .setValue(u201CPARAM_ECu201D, [java.lang.Object]);
         } catch (Exception e) {
            // Exception Handling
Regards,
Volker