Programmatically creating a work item in the java client api's.

This is explained here: https://jazz.net/wiki/bin/view/Main/ProgrammaticWorkItemCreation

If you need more code examples e.g. how to set attribute values, or find team areas by name look here: https://rsjazz.wordpress.com/2015/02/27/a-rtc-workitem-command-line-version-2-2/ and search the blog for keywords.

WorkItemOperation 

If you really want to use the WorkingCopyManager, this code has worked for me:

	private void createWorkPackage(String sFId, String sSummary, String sDescript,
			String sTeamCat, String sPlanDate, String sDueDate, String sOwner) {
		try {
			IProgressMonitor monitor = new NullProgressMonitor();
			IWorkItemClient  workItemService = (IWorkItemClient) targetRepository
			.getClientLibrary(IWorkItemClient.class);
			IWorkItemHandle handle = workItemService.getWorkItemWorkingCopyManager()
					.connectNew(mappedInternalWorkItemType, monitor);
			WorkItemWorkingCopy wc = workItemService.getWorkItemWorkingCopyManager()
					.getWorkingCopy(handle);
			IWorkItem workItem = wc.getWorkItem();
			try {
				List findCategories = workItemService.findCategories(
						targetProjectArea, ICategory.FULL_PROFILE, monitor);
				
				Integer nCount = 0;
				ICategory tmpCategory;
				do
				{
					tmpCategory = findCategories.get(nCount++);
				} while (nCount=findCategories.size())
					throw new TeamRepositoryException("Error applying Category to WI");
				
				workItem.setCategory(tmpCategory);
				
				workItem.setCreator(workPackageInitialCreator);
				workItem.setOwner(workPackageInitialOwner);
				workItem.setHTMLSummary(XMLString
						.createFromPlainText(sSummary));
				workItem.setHTMLDescription(XMLString
						.createFromPlainText(sDescript));
							
				try {
					if (!workItem.hasCustomAttribute(externalIDWorkItemAttribute)) {
						IAttribute newAttribute = externalIDWorkItemAttribute;
						workItem.addCustomAttribute(newAttribute);
						workItem.setValue(newAttribute, sFId);
					}
					
				} catch (RuntimeException e) {
					System.out.println(e.getMessage());
					System.out.println(e.toString());
					e.printStackTrace();
				}
			
				IDetailedStatus s = wc.save(monitor);
				if (!s.isOK()) {
					throw new TeamRepositoryException("Error saving work item",
							s.getException());
				}
			} finally {
				workItemService.getWorkItemWorkingCopyManager().disconnect(workItem);
			}
			workItem = (IWorkItem) targetRepository.itemManager().fetchCompleteItem(
					workItem, IItemManager.DEFAULT, monitor);
			monitor.subTask("Created a work item " + workItem.getId());
		} catch (TeamRepositoryException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}