java.lang.NullPointerException

[former_member204873]

hi All,

I am getting following exception when i am using custom adapter module. How can i know where i.e. in which part of code this exception is raised.

2009-09-17 16:43:15 Information MP: processing local module localejbs/EJBModulePDF

2009-09-17 16:43:15 Error MP: exception caught with cause java.lang.NullPointerException

2009-09-17 16:43:15 Error Adapter Framework caught exception: null

2009-09-17 16:43:15 Error Delivering the message to the application using connection File_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: java.lang.NullPointerException.

Thanks,

Mayank

[Former Member]

you need not deploy external jar on the PI server.you just add as external jars while creating the module

[Former Member]

Imagine you would like to use 3rd party API in multiple custom-developed components... It is common (and best practice) to wrapp those jar files deployed in separate "external" DC and expose it centrally to other DCs using public parts. , instead of having the same functionality multiple times.

BR

Rudolf

[Former Member]

you can trace by adding audit log

refer this /people/ganesh.karicharla2/blog/2008/02/20/adapter-module-development-module-configuration for how to add audit log

Example
   Audit.addAuditLogEntry(amk, AuditLogStatus.SUCCESS,
     "AO: Now got the xml payload object.")

you can see audit log that you add in the module in the RWB communication channel monitoring

[former_member204873]

hi,

My code is:

public ModuleData process(ModuleContext moduleContext,

ModuleData inputModuleData)

throws ModuleException {

Object obj = null;

Message msg = null;

MessageKey amk = null;

try {

obj = inputModuleData.getPrincipalData();

msg = (Message) obj;

amk = new MessageKey(msg.getMessageId(),msg.getMessageDirection());

Audit.addAuditLogEntry(amk, AuditLogStatus.SUCCESS, "EJBModulePDF: Module called");

}

catch (Exception e) {

ModuleException me = new ModuleException(e);

throw me;

}

try {

obj = inputModuleData.getPrincipalData();

msg = (Message) obj;

XMLPayload xpld = msg.getDocument();

String xmltxt = xpld.getText();

InputStream in = new ByteArrayInputStream(xmltxt.getBytes("UTF-8"));

Document doc = null;

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder db = dbf.newDocumentBuilder();

doc = db.parse(in);

NodeList list_Set=doc.getElementsByTagName("record");

NodeList list_Set1=doc.getElementsByTagName("EmployeeName");

NodeList list_Set2=doc.getElementsByTagName("EmployeeID");

NodeList list_Set3=doc.getElementsByTagName("Unit");

NodeList list_Set4=doc.getElementsByTagName("Role");

String input = "";

for(int i = 0; i < list_Set.getLength(); i++){

Node f=list_Set1.item(i);

f=f.getFirstChild();

String str_f=f.getNodeValue();

Node f2=list_Set2.item(i);

f2=f2.getFirstChild();

String str_f2=f2.getNodeValue();

Node f3=list_Set3.item(i);

f3=f3.getFirstChild();

String str_f3=f3.getNodeValue();

Node f4=list_Set4.item(i);

f4=f4.getFirstChild();

String str_f4=f4.getNodeValue();

input = input + str_f + "," + str_f2 + "," + str_f3 + "," + str_f4 + "END" ; }

// String input = (String) inputModuleData.getPrincipalData();

ByteArrayOutputStream baos = new ByteArrayOutputStream();

ObjectOutputStream oos = new ObjectOutputStream(baos);

com.lowagie.text.Document document = new com.lowagie.text.Document();

try {

PdfWriter.getInstance(document,oos);

document.open();

PdfPTable table = new PdfPTable(4);

PdfPCell cell =

new PdfPCell(new Paragraph("Employee Details"));

cell.setColspan(4);

cell.setBackgroundColor(Color.red);

cell.setHorizontalAlignment(Element.ALIGN_CENTER);

table.addCell(cell);

cell = new PdfPCell(new Paragraph("Employee Name"));

cell.setBackgroundColor(Color.blue);

table.addCell(cell);

cell = new PdfPCell(new Paragraph("Employee ID"));

cell.setBackgroundColor(Color.blue);

table.addCell(cell);

cell = new PdfPCell(new Paragraph("Unit"));

cell.setBackgroundColor(Color.blue);

table.addCell(cell);

cell = new PdfPCell(new Paragraph("Designation"));

cell.setBackgroundColor(Color.blue);

table.addCell(cell); String inputArray[] = input.split("END");

for (int i = 0; i < inputArray.length; i++) {

String fieldValuesArray[] = inputArray<i>.split(",");

for (int j = 0; j < fieldValuesArray.length; j++) {table.addCell(fieldValuesArray[j].toString());}}document.add(table); }catch (DocumentException de) {

System.err.println(de.getMessage());}

document.close();

String xmlpld = document.toString();

XMLPayload sendpyld = null;

sendpyld.setText(xmlpld);

msg.setDocument(sendpyld);

inputModuleData.setPrincipalData(msg);

}catch (Exception e) {

ModuleException me = new ModuleException(e);

throw me;

}

return inputModuleData;

}

And i am able to se audit log in RWB.

2009-09-18 10:07:14 Information EJBModulePDF: Module called

2009-09-18 10:07:16 Error MP: exception caught with cause java.lang.NullPointerException

2009-09-18 10:07:16 Error Adapter Framework caught exception: null

2009-09-18 10:07:16 Error Delivering the message to the application using connection File_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: java.lang.NullPointerException.

How can i know where exactly null exception is raised.

[former_member204873]

hi,

I added audit logs in my code after every line, all the logs are visible in RWB MDT.

My last lines in the code are:

Audit.addAuditLogEntry(amk, AuditLogStatus.SUCCESS, "27");

return inputModuleData;

now exception coming is as follows:

2009-09-22 16:52:49 Information 27

2009-09-22 16:52:49 Error MP: exception caught with cause javax.ejb.RemoveException: An attemp was made to remove stateful instance while it still participates in a transaction.This is strictly forbidden by the EJB Specification. However the current transaction won't be marked for rollback allowing you to recover from the error.

2009-09-22 16:52:49 Error Adapter Framework caught exception: An attemp was made to remove stateful instance while it still participates in a transaction.This is strictly forbidden by the EJB Specification. However the current transaction won't be marked for rollback allowing you to recover from the error.

2009-09-22 16:52:49 Error Delivering the message to the application using connection File_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: javax.ejb.RemoveException: An attemp was made to remove stateful instance while it still participates in a transaction.This is strictly forbidden by the EJB Specification. However the current transaction won't be marked for rollback allowing you to recover from the error..

2009-09-22 16:52:49 Information The message status was set to WAIT.

what does this error mean?

thanks,

mayank

[Former Member]

Hi Mayank,

Check your bean type whether it is stateless or statefull and check this link

Regards

Ramesh

[former_member270496]

hi Mayank,

i am facing sama problem as of yours which is listed below:

[ 08.08.2011 14:27:26 Error MP: Exception caught with cause java.lang.NullPointerException

08.08.2011 14:27:26 Error Exception caught by adapter framework: null

08.08.2011 14:27:26 Error Delivery of the message to the application using connection JDBC_http://sap.com/xi/XI/System failed, due to: com.sap.aii.af.ra.ms.api.RecoverableException: java.lang.NullPointerException.

08.08.2011 14:27:26 Error The message status set to NDLV ]

please,tell me how you solved the problem?

Regards,

Raj Tripathy

[Former Member]

Hi Mayank ,

Please check below SAP note which will provide you troubleshooting for your issue::

Note 1062037 - java.lang.NullPointerException error in Adapter activation

Thanks..

Mohit

[former_member204873]

hi,

I am using adapter module only and able to activate the channel, i am getting this error at runtime and also it is able to enter process method of module.

Thanks,

Mayank

[Former Member]

Hi Mayank,

provide exception handling within your custom code and trace processing to identify at least the method, where exception is thrown. Be aware, that if you are using some external libs / jars in your custom module, those should be also deployed on PI. Otherwise you will get null pointer exceptions by doing instantiation.

Regards

Rudolf