create releases in project using RTC Plain Client java apis

public void createRelease(IProjectArea projectAreaCopy, IIterationHandle newIteration, ITeamRepository teamRepository) throws TeamRepositoryException {
    IProcessItemService processItemService = (IProcessItemService) teamRepository
            .getClientLibrary(IProcessItemService.class);
    IWorkItemClient service = (IWorkItemClient) repository.getClientLibrary(IWorkItemClient.class);
    IDeliverable release = service.createDeliverable(projectAreaCopy, "RT_Release_test4", null);
    release.setArchived(false);
    release.setName("RT_Release_test4");
    release.setFiltered(false);
    release.setArtifact(newIteration);
    release.setIteration(newIteration);
    processItemService.save(new IProcessItem[]{projectAreaCopy}, null);
}
    

projectAreaCopy is working copy of IProjectArea.
    

The code does not throw any exceptions but does not even create release in project.
    

My requirement is to create release and assign it to an iteration through RTC Plain client Java Api.
    

IDE tool - IntelliJ Idea 2018
    

Please guide me through this.
    

Regards,
    

Arati