Java mapping assistance

[former_member764656]

Hi.

I need help in modifying below Java mapping code.

Request(payload) ->REST Lookupservice->Response(payload)->Combine request & response payload - > Receiver
Using rest lookup service, getting the response payload.
Requirement is to combine Request payload and response payload from rest lookup.
I need the combined payload to further process it for the subsequent call. I'm a bit of struggler with Java.
Kindly help in code to achieve the combined payload result.

package Test;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
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;
import com.sap.aii.mapping.lookup.LookupService;
import com.sap.aii.mapping.lookup.Payload;
import com.sap.aii.mapping.lookup.SystemAccessor;
public class Test extends AbstractTransformation {
  public void transform(TransformationInput in, TransformationOutput out)
  throws StreamTransformationException {
	  
  Channel channel = LookupService.getChannel("BC_Info","CC_REST_REC_Test");
  Payload payload = LookupService.getXmlPayload(in.getInputPayload().getInputStream());
  SystemAccessor accessor = LookupService.getSystemAccessor(channel);
  
  Payload resp1 = accessor.call(payload);
  try{
  String respayloadstring= covertInputStringStreamToString(resp1.getContent());
  
  out.getOutputPayload().getOutputStream().write(respayloadstring.getBytes());
 
  
  }catch (IOException e)
  {
	  e.printStackTrace();
	  }
  }

  private static String covertInputStringStreamToString(InputStream inputstream) throws IOException{
  ByteArrayOutputStream result=new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  int length;
  while((length=inputstream.read(buffer)) !=-1){
	  result.write(buffer, 0, length);
  
 }
return result.toString(StandardCharsets.UTF_8.name()); 
  }
}