Activiti suspend and activate tasks

        Activiti Code for suspending and activating tasks

public void suspendProcess(String businessKey)
{
    ProcessInstanceQuery processInstanceQuery = runtimeService.createProcessInstanceQuery().processInstanceBusinessKey(businessKey);
    if (processInstanceQuery != null) {
        logger.debug(" Workflow status before suspension :" + (processInstanceQuery.singleResult().isSuspended() ? " Hang up " : " Activate "));
        if (!processInstanceQuery.singleResult().isSuspended()) {
            runtimeService.suspendProcessInstanceById(processInstanceQuery.singleResult().getId());
        }
        logger.debug(" Workflow status after suspension :" + (processInstanceQuery.singleResult().isSuspended() ? " Hang up " : " Activate "));
    }
}

public void activateProcess(String businessKey)
{
    ProcessInstanceQuery processInstanceQuery = runtimeService.createProcessInstanceQuery().processInstanceBusinessKey(businessKey);
    if (processInstanceQuery != null) {
        logger.debug(businessKey + "  Workflow status before activation : " + (processInstanceQuery.singleResult().isSuspended() ? " Hang up " : " Activate "));
        if (processInstanceQuery.singleResult().isSuspended()) {
            runtimeService.activateProcessInstanceById(processInstanceQuery.singleResult().getId());
        }
        logger.debug(businessKey + "  Workflow status after activation : " + (processInstanceQuery.singleResult().isSuspended() ? " Hang up " : " Activate "));
    }
}