Testing and Debugging Java Mapping in Developer Studio

[stefan_grube]

In some forum entries, I found a question about debugging Java Mapping. There are a lot of Blogs about Java Mappings like this one of Thorsten Søbirk:
Using JAXP to both parse and emit XML in XI Java mapping programs

Now, how should you debug your code before a upload it to the XI? It is quite simple: Add the method "main" to your Java Mapping class.

Here is a template for a Java Mapping class with the method "main":

 

package sample;



import java.io.*;

import com.sap.aii.mapping.api.*;





public class MyJavaMapping extends AbstractTransformation {



  DynamicConfiguration conf; // used for dynamic configuration 

                             // (adapter-specific message attributes) 

  InputParameters param;     // used for input parameters





  // the method "transform" is called by Java Mapping Runtime

  public void transform (TransformationInput arg0, TransformationOutput arg1)  

                        throws StreamTransformationException {



    conf = arg0.getDynamicConfiguration(); // provide dynamic configuration 

    param = arg0.getInputParameters();     // provide input parameters

    this.execute(arg0.getInputPayload().getInputStream(), 

                 arg1.getOutputPayload().getOutputStream());



  }



  // the method "execute" is called by "transform" and "main"

  public void execute (InputStream in, OutputStream out)  

                      throws StreamTransformationException {





    // Add your code here



  }



  // reading dynamic values

  String getDynamicValue(String namespace, String name){



    if (conf == null) // in test mode, dynamic parameters cannot be used. 

      return "";      // Use default values instead

    DynamicConfigurationKey key = 

                 DynamicConfigurationKey.create(namespace, name);

    return conf.get(key);



  }

 

  // reading input parameters

  String getInputParameter(String name){



    if (param == null){  // in test mode, input parameters cannot be used. 

      return "";         // Use default values instead

    } else {

      return (String) param.getValue(name);

    }

  }



  // the method "main" is using files for input and output

  public static void main(String[] args) {



    try {

      InputStream in = new FileInputStream(new File("in.xml"));

      OutputStream out = new FileOutputStream(new File("out.xml"));

      MyJavaMapping myMapping = new MyJavaMapping();

      myMapping.execute(in, out);

    } catch (Exception e) {

      e.printStackTrace();

    }

  }

}

 

All you have to do is placing an xml file "in.xml" in the working directory of your Java program, set a breakpoint and start the program.

API Documentation

https://help.sap.com/doc/javadocs_pi_sp3_xpi/7.1.3/en-US/index.html

Additional Information

See also this Weblog for Debugging Java Mappings using SAP Netweaver Developer Studio

Examples for Java Mapping (scroll down to III-Java Mapping)