hi,

i am trying to show the graph of the current task in the process instance that i pass by the taskInstanceId parameter.
today i can see the general graph of the process , not of the
instance of the process .
the error in on :
gpdBytes = fileDefinition.getBytes("gpd.xml");

because the fileDefinition comes out null.
should i insert a file definition to the processdefinition.xml ?
and if so - how ?

 final long serialVersionUID = 1L;
 long taskInstanceId = -1;
 long tokenInstanceId = -1;

 byte[] gpdBytes = null;
 byte[] imageBytes = null;
 Token currentToken = null;
 ProcessDefinition processDefinition = null;

 String currentTokenColor = "red";
 String childTokenColor = "blue";
 String tokenNameColor = "blue";

 ProcessImageJbpm PIJ = new ProcessImageJbpm();

 String tempInsId = DBDate.nullstring(request
 .getParameter("TaskInstanceId"));

 if (tempInsId.equals(""))
 tempInsId = "0";

 long TaskInstanceId = Long.parseLong(tempInsId);

 try {

 JbpmConfiguration jbpmConfiguration = JbpmConfiguration.getInstance();
 JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();

 TaskInstance taskInstance = jbpmContext.getTaskMgmtSession().loadTaskInstance(TaskInstanceId);

 currentToken = taskInstance.getToken();

 processDefinition = currentToken.getProcessInstance().getProcessDefinition();

 PIJ.setCurrentToken(currentToken);


 FileDefinition fileDefinition = processDefinition.getFileDefinition();
 if(fileDefinition!=null)
 {
 gpdBytes = fileDefinition.getBytes("gpd.xml");
 imageBytes = fileDefinition.getBytes("processimage.jpg");

 if (gpdBytes != null && imageBytes != null) {
 int borderWidth = 4;
 Element rootDiagramElement = DocumentHelper.parseText(
 new String(gpdBytes)).getRootElement();
 int[] boxConstraint;
 int[] imageDimension = PIJ
 .extractImageDimension(rootDiagramElement);
 String imageLink = "processimage?definitionId="
 + processDefinition.getId();

 if (tokenInstanceId > 0) {

 List allTokens = new ArrayList();
 allTokens = PIJ.walkTokens(currentToken, allTokens);

 out.println("<div style='position:relative; background-image:url("
 + imageLink
 + "); width: "
 + imageDimension[0]
 + "px; height: "
 + imageDimension[1] + "px;'>");

 for (int i = 0; i < allTokens.size(); i++) {
 Token token = (Token) allTokens.get(i);

 //check how many tokens are on teh same level (= having the same parent)
 int offset = i;
 if (i > 0) {
 while (offset > 0&& ((Token) allTokens.get(offset - 1)).getParent().equals(token.getParent())) {
 offset--;
 }
 }
 boxConstraint = PIJ.extractBoxConstraint(rootDiagramElement, token);

 //Adjust for borders
 boxConstraint[2] -= borderWidth * 2;
 boxConstraint[3] -= borderWidth * 2;

 out.println("<div style='position:absolute; left: "
 + boxConstraint[0] + "px; top: "
 + boxConstraint[1] + "px; ");

 if (i == (allTokens.size() - 1)) {
 out.println("border: " + currentTokenColor);
 } else {
 out.println("border: " + childTokenColor);
 }

 out.println(" " + borderWidth + "px groove; "
 + "width: " + boxConstraint[2]
 + "px; height: " + boxConstraint[3]
 + "px;'>");

 if (token.getName() != null) {
 out.println("<span style='color:"
 + tokenNameColor
 + ";font-style:italic;position:absolute;left:"
 + (boxConstraint[2] + 10)
 + "px;top:"
 + ((i - offset) * 20)
 + ";'> " + token.getName()
 + "</span>");
 }

 out.println("</div>");
 }
 out.println("</div>");
 } else {
 boxConstraint = PIJ.extractBoxConstraint(rootDiagramElement);

 out.println("<table border=0 cellspacing=0 cellpadding=0 width="
 + imageDimension[0]
 + " height="
 + imageDimension[1] + ">");
 out.println(" <tr>");
 out.println(" <td width=" + imageDimension[0]
 + " height=" + imageDimension[1]
 + " style=\"background-image:url(" + imageLink
 + ")\" valign=top>");
 out.println(" <table border=0 cellspacing=0 cellpadding=0>");
 out.println(" <tr>");
 out.println(" <td width="
 + (boxConstraint[0] - borderWidth)
 + " height="
 + (boxConstraint[1] - borderWidth)
 + " style=\"background-color:transparent;\"></td>");
 out.println(" </tr>");
 out.println(" <tr>");
 out.println(" <td style=\"background-color:transparent;\"></td>");
 out.println(" <td style=\"border-color:"
 + currentTokenColor
 + "; border-width:"
 + borderWidth
 + "px; border-style:groove; background-color:transparent;\" width="
 + boxConstraint[2]
 + " height="
 + (boxConstraint[3] + (2 * borderWidth))
 + "> </td>");
 out.println(" </tr>");
 out.println(" </table>");
 out.println(" </td>");
 out.println(" </tr>");
 out.println("</table>");
 }
 out.flush();
 }
 }
 }
 catch (IOException e) {
 e.printStackTrace();
 //throw new JspException("table couldn't be displayed", e);
 }
 catch (DocumentException e)
 {
 e.printStackTrace();
 }
 //throw new JspException("table couldn't be displayed", e);
 catch (Exception e) {
 e.printStackTrace();
 }

 taskInstanceId = -1;
 gpdBytes = null;
 imageBytes = null;
 currentToken = null;