此例項是一個最簡單的在執行時人為動態改變流程運轉的例項，意在為任意流、駁回等功能拋磚引玉.

定義一個最簡單的流程，它只有一個“開始事件”、一個“ServiceTask”、一個“結束事件”.

我們現在的要實現的是直接跳過ServiceTask。

ServiceTask的實現類只是簡單的在控制檯輸出一條語句.

public class Log implements JavaDelegate {

	public void execute(DelegateExecution execution) throws Exception {
		System.err.println("如果我出現了，就說明我沒被忽略");
		
	}
	
}
 

		
		System.out.println("直接跳過ServiceTask的流程開始..................");
		
		RepositoryService repositoryService = activitiRule.getRepositoryService();
	
		ProcessDefinition processDefinition = 
				repositoryService.createProcessDefinitionQuery().deploymentId("1").singleResult();
		
		ProcessDefinitionEntity processDefinitionEntity = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
				.getDeployedProcessDefinition(processDefinition.getId());
		
		List<ActivityImpl> activities = processDefinitionEntity.getActivities();
		
		ActivityImpl start = null;
		ActivityImpl task = null;
		ActivityImpl end = null;
		
		
		for (ActivityImpl activity : activities) {
			if (activity.getId().equals("startevent1")) {
				start = activity;
			}
			if (activity.getId().equals("usertask1")) {
				task = activity;
			}
			if (activity.getId().equals("endevent1")) {
				end = activity;
			}
		}
		//清除原先的路徑
		List<PvmTransition> cacheTran = start.getOutgoingTransitions();
		start.getOutgoingTransitions().clear();
		//建立新路徑
		TransitionImpl tran = start.createOutgoingTransition();
		tran.setDestination(end);
		
		RuntimeService runtimeService = activitiRule.getRuntimeService();
		runtimeService.startProcessInstanceById(processDefinitionEntity.getProcessDefinition().getId());
		
		//恢復原來路徑
		start.getOutgoingTransitions().clear();
		for (PvmTransition transition : cacheTran) {
			start.createOutgoingTransition().setDestination((ActivityImpl) transition.getDestination());
		}
		
	
 

當註釋掉

start.getOutgoingTransitions().clear();

serviceTask將被執行.

這種方法只會影響一個流程例項的流程定義的記憶體映象，其他流程不會受到影響.