Workflow with item type and item key is in progress. Abort existing workfl

Question

Dear all,
I'm using the below code from the submit button event to launch the workflow. The workflow works fine when I submit for the first time, when i try to submit for the second time from the same session it throws me the error as Workflow with item type and item key is in progress. Abort existing workflow.
Where I am struck,Kindly send me any solution.
I am using below code in oaf
public void workflow(OAPageContext pageContext,
String headerId,
String empName,
String userName
String wfItemType = "XXSample";
String wfProcess = "XXSample";
String wfItemKey = headerId;
OANavigation wfClass = new OANavigation();
// Create Workflow Process
wfClass.createProcess(pageContext, wfItemType, wfProcess, wfItemKey);
System.out.println("Workflow created");
wfClass.setItemAttrText(pageContext,
wfItemType,
wfItemKey,
"XXHDRID",
headerId);
wfClass.setItemAttrText(pageContext,
wfItemType,
wfItemKey,
"XXEMPNAME",
employeeName);
wfClass.setItemOwner(pageContext, wfItemType, wfItemKey,username);
wfClass.startProcess(pageContext, wfItemType, wfProcess, wfItemKey);
System.out.println("Workflow started");
Thanks,
Kumar.

Answer 1

Item type and item key forms unique record for the workflow session, you cannot have 2 instances of the workflow running for the same header id, in your case. Check if the process exists for the header id. If so, display a warning message without launching another workflow session, else start the workflow process.
Thanks
Shree