Exception adding attachment from custom worklist client

Question

I am building a custom Human Task Editor for BPEL. This is a java standalone (at the moment) and runs on my local Mac machine. The SOA Suite 11g is installed on Linux hosted box.
A BPEL process is already deployed and an instance created. The instance has reached the 'human task' activity. I can also verify this from <host:port/integration/worklistapp>. However, we plan to build our own worklist app.
In this custom worklist app (which is configured through REMOTE protocol ), I make use of the taskQueryService to fetch a list of all human tasks assigned to a particular user. This returns me with a list. All works well.
However, when I try to add an attachment to one of the tasks, I get an exception.
-------------------CODE:----------------------------------
import oracle.bpel.services.workflow.task.model.AttachmentTypeImpl;
In my main class :
AttachmentTypeImpl at = new AttachmentTypeImpl() {
public InputStream getInputStream() {
throw new UnsupportedOperationException("Not supported yet.");
public void setInputStream(InputStream arg0) {
throw new UnsupportedOperationException("Not supported yet.");
public void setBoundary(String arg0) {
throw new UnsupportedOperationException("Not supported yet.");
public String getBoundary() {
throw new UnsupportedOperationException("Not supported yet.");
at.setContent("THIS IS ATTACH CONTENT");
at.setMimeType("application/msword");
at.setName("MyAttach.doc");
task.addAttachment(at);
try {
taskSrvc.addAttachment(ctx, task.getSystemAttributes().getTaskId(), at);
} catch (StaleObjectException ex) {
} catch (WorkflowException ex) {
--------- EXCEPTION --------------------
Exception in thread "main" java.lang.NullPointerException
at oracle.xml.jaxb.JaxbNode.getOwnerDocument(JaxbNode.java:237)
at oracle.xml.jaxb.JaxbNode.setJaxbElement(JaxbNode.java:782)
at oracle.bpel.services.workflow.task.model.AttachmentTypeImpl.setContent(AttachmentTypeImpl.java:50)
at customworklistclilent.Main.addAttachment(Main.java:224)
at customworklistclilent.Main.queryTasks(Main.java:156)
at customworklistclilent.Main.main(Main.java:70)
Has anyone tried adding an attachment from the custom worklist client using remote ejb interface

Answer 1

Have you tried working with the addAttachment() method of the Message interface (http://help.sap.com/javadocs/pi/SP3/xpi/com/sap/engine/interfaces/messaging/api/Message.html#addAttachment%28com.sap.engine.interfaces.messaging.api.Payload%29) ... It may require some (major) redesign of your JAVA mapping (I'm still on XI, so I can't validate this assumption)
Chris