PI Java Mapping NullPointerException

[Former Member]

Hi Gurus,

I'm having some troubles doing the mapping through java mapping in PI.

I've done the java class in the SAP NWDS and imported it on PI through the ESR.

Now i'm trying to test through the SOAP and i've found the following error in the "Communication Channel Monitor":

500   Internal Server Error  SAP NetWeaver Application Server/Java AS 

java.lang.NullPointerException: while trying to invoke the method com.sap.aii.af.sdk.xi.lang.Binary.getBytes() of a null object returned from com.sap.aii.af.sdk.xi.mo.xmb.XMBPayload.getContent()

And the following error in the SXMB_MONI:

<SAP:Category>XIServer</SAP:Category>

  <SAP:Code area="INTERNAL">CLIENT_SEND_FAILED</SAP:Code>

  <SAP:P1>500</SAP:P1>

  <SAP:P2>Internal Server Error</SAP:P2>

  <SAP:P3>(See attachment HTMLError for details)</SAP:P3>

  <SAP:P4 />

  <SAP:AdditionalText />

  <SAP:Stack>Error while sending by HTTP (error code: 500 , error text: Internal Server Error) (See attachment HTMLError for details)</SAP:Stack>

I've developed the code below:

public class PI_Mapping_IF extends AbstractTransformation {
  public void transform(TransformationInput in, TransformationOutput out)    throws StreamTransformationException  {   
  this.execute(in.getInputPayload().getInputStream(), out.getOutputPayload().getOutputStream());  
  }
  public void execute(InputStream in, OutputStream out)  throws StreamTransformationException {  
  try   
  {  
  // Inicio do java mapping
  getTrace().addInfo("JAVA Mapping Iniciado"); //Log para o PI/XI
  // Declarações referentes ao XML de entrada
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  DocumentBuilder db = dbf.newDocumentBuilder();
  Document xml_in = db.parse(in); 
  // Declarações referentes ao XML de saída
  Document xml_out = db.newDocument();
  TransformerFactory transformerFactory = TransformerFactory.newInstance(); 
  Transformer transformer = transformerFactory.newTransformer();
  // Remove o standalone
  xml_in.setXmlStandalone(true);
  // Declara a estrutura que a RFC irá receber
  Element root = xml_out.createElement("ns1:ZFSD_VMOI_UPLOAD_CF_PG");
  root.setAttribute("xmlns:ns1","urn:sap-com:document:sap:rfc:functions");
  xml_out.appendChild(root);
  Element i_cenario = xml_out.createElement("I_CENARIO");
  root.appendChild(i_cenario);
  Element t_input = xml_out.createElement("T_INPUT");
  root.appendChild(t_input);
  Element item = xml_out.createElement("ITEM");
  t_input.appendChild(item);
  Element STRING = xml_out.createElement("STRING");
  item.appendChild(STRING);
  Element t_return = xml_out.createElement("T_RETURN");
  root.appendChild(t_return);
  Element item_r = xml_out.createElement("ITEM");
  t_return.appendChild(item_r);
  Element message = xml_out.createElement("MESSAGE");
  item_r.appendChild(message);
  // Verifica se existe algum filho no nó
  NodeList nodos = xml_in.getChildNodes();  
  if (nodos.item(0) != null) 
  {     
  getTrace().addInfo("O nó(XML) possui filhos"); //Log para o PI/XI


  // Declaração de variáveis
  String ident = ""; // <Ident>
  String buyer = ""; // <BuyerLineItemNum>
  String result = ""; // <Ident>;<BuyerLineItemNum>;<Date>;<QuantityValue>

  // Inicia a extração das informações do XML
  try{
  // Recupera o nó ShipToParty
  NodeList nodeShip = xml_in.getElementsByTagName("ns0:ShipToParty");
  Node node = nodeShip.item(0);
  Element elemXML = (Element) node;
  try{
  NodeList nodeIdent = elemXML.getElementsByTagName("ns0:Ident");
  Element nameElement = (Element) nodeIdent.item(0);
  nodeIdent = nameElement.getChildNodes();
  // Recupera o valor da chave <Ident>
  ident = PI_Mapping_IF.VerifyNull(((Node) nodeIdent.item(0)).getNodeValue());
  }catch(Exception e){
  result += "0.0;";
  }


  // Recupera o nó ListOfMaterialGroupedPlanningDetail
  NodeList nodeBuyer  = xml_in.getElementsByTagName("ns0:MaterialGroupedPlanningDetail");
  for (int i = 0; i < nodeBuyer.getLength(); i++) {


  node = nodeBuyer.item(i);
  elemXML = (Element) node;
  try{
  // Preenche a chave BuyerLineItemNum
  NodeList nodeBuyerLine = elemXML.getElementsByTagName("ns0:BuyerLineItemNum");
  Element elemBuyerLine = (Element) nodeBuyerLine.item(0);
  nodeBuyerLine = elemBuyerLine.getChildNodes();
  buyer = PI_Mapping_IF.VerifyNull(((Node) nodeBuyerLine.item(0)).getNodeValue());
  }catch(Exception e){
  buyer += "0;";
  }


  result = ident+";"+buyer+";";
  Node nodeDt_Qnt = nodeBuyer.item(i);
  Element elemDt_Qnt = (Element)nodeDt_Qnt;
  NodeList nodeValores = elemDt_Qnt.getElementsByTagName("ns0:ScheduleDetail");
  for (int j = 0; j < nodeValores.getLength(); j++) {


  node = nodeValores.item(j);
  elemXML = (Element) node;
  try{
  // Preenche a chave Date
  NodeList modelExtra = elemXML.getElementsByTagName("ns0:Date");
  Element extraElement = (Element) modelExtra.item(0);
  modelExtra = extraElement.getChildNodes();
  result += PI_Mapping_IF.VerifyNull(((Node) modelExtra.item(0)).getNodeValue())+";";
  }catch(Exception e){
  result += "//;";
  }


  try {
  // Preenche a chave QuantityValue
  NodeList modelURL = elemXML.getElementsByTagName("ns0:QuantityValue");
  Element urlElement = (Element) modelURL.item(0);
  modelURL = urlElement.getChildNodes();
  result += PI_Mapping_IF.VerifyNull(((Node) modelURL.item(0)).getNodeValue())+";";
  } catch (Exception e) {
  result += "0.0;";
  }
  }
  // Marca o final do registro
  result += "||";
  // Preenche os nós itens
  Text srcxml = xml_out.createTextNode(result);
  STRING.appendChild(srcxml);
  result = "";
  buyer = "";
  }
  }catch(Exception e){
  }
  // Remove o standalone
  xml_out.setXmlStandalone(true);
  // Preenche o Cenario
  Text cenario = xml_out.createTextNode("P&G");
  i_cenario.appendChild(cenario);
  // Preenche mensagem de retorno
  Text msgxml = xml_out.createTextNode("XML lido com sucesso!");
  message.appendChild(msgxml);
  // Escreve a saida do XML             
  transformer.transform(new DOMSource(xml_out), new StreamResult(out));
  getTrace().addInfo("Fim da execução do Java Mapping");
  }
  } catch (ParserConfigurationException e) {
  getTrace().addWarning(e.getMessage()); 
  throw new StreamTransformationException("Can not create DocumentBuilder.", e);
  } catch (SAXException e) {
  e.printStackTrace();
  } catch (IOException e) {
  e.printStackTrace();
  } catch (TransformerConfigurationException e) {
  e.printStackTrace();
  } catch (TransformerException e) {
  e.printStackTrace();
  }
  }

Am i doing anything wrong in the code? Where can this nullpointerexception be triggered?

Thanks.

[Former Member · Accepted solution]

Hi.

Try to use operation mapping test at ESR over similar payload, and send the stacktrace.

[Former Member · Accepted solution]

where is "ns0" bound to some namespace, by the way?

[Former Member · Accepted solution]

I haven't thought of doing this, now i'm investigating what could be wrong, since the ESR aren't working with the same XML from the SOAP.

Thank you very much for now

[Former Member · Accepted solution]

Didn't understand this question, what do you mean by bound "ns0" to a namespace?

Thanks.

[Former Member · Accepted solution]

These three xml are the same:

• <?xml version="1.0"?><a:xml xmlns:a="urn:123">root</a:xml>
• <?xml version="1.0"?><xml xmlns="urn:123">root</xml>
• <?xml version="1.0"?><ns0:xml xmlns:ns0="urn:123">root</ns0:xml>

But your code will work only with last one, because it doesn't bound namespace to prefix ns0.

[Former Member · Accepted solution]

No, mapping test and runtime launch will work with the same payload, not <SOAP:Envelope> or sth like that. The main difference is only DynamicConfiguration and some runtime parameters (MessageId and so on), but your code doesn't use those.

[Former Member · Accepted solution]

You're right, but how can i do this?

Thanks.

[Former Member · Accepted solution]

Now it's working on ESR, but not in SOAP with the same XML..

[Former Member · Accepted solution]

As far as I remember, you should implement NamespaceContext class: NamespaceContext (Java Platform SE 6). I will look for example.

[Former Member · Accepted solution]

1. Is this java mapping the only one in operation mapping, or there are others mapping steps?

2. What is the URL for sending message to? (for example, you could use soapUI, provide us HTTP POST dump for sender)

[Former Member · Accepted solution]

Sorry for confusing you, NamespaceContext is only for XPath requests. For your way of extraction, instead of

NodeList nodeShip = xml_in.getElementsByTagName("ns0:ShipToParty"); 

you should use

NodeList nodeShip = xml_in.getElementsByTagNameNS("*", "ShipToParty"); 

or precise namespace:

NodeList nodeShip = xml_in.getElementsByTagNameNS("urn:tra-la-la:something-everywhere", "ShipToParty"); 

[Former Member · Accepted solution]

I've tried the two options, but it didn't work =/

[Former Member · Accepted solution]

The main problem was the Element name, the correct was "item" and i was creating "ITEM".

Thank you all!