异常和未找到转换时的全局转换

Question

我有3个spring web流——流1、流2、流3。flow2和flow 3已按如下方式指定父flow1：

<flow xmlns="http://www.springframework.org/schema/webflow"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/webflow
http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd"
  parent="flow1">

在流1中，我有一个全局转换和一个结束状态：

<end-state id="flowInterrupted" view="flowInterruptedPage"/>

<global-transitions>
    <transition on-exception="com.core.exceptions.policy.InvalidPolicyContactException" to="flowInterrupted">
        <evaluate expression="webFlowService.clearCurrentInterruptCause()"/>
    </transition>
</global-transitions>

在我的应用程序中的某个时刻，在flow2中，子流flow3被称为

<subflow-state id="stateInFlow2WhereSubFlow3IsDefined" subflow="flow3">

</subflow-state>

，在流程3中，抛出了一个InvalidPoleyContactException。它在流程1中被正确地找到（因为它的目的是清除货币中断原因（）），但后来抛出了一个异常，即在流程2中没有找到流程中断的转换-这是真的，因为它在流程1中（定义了全局转换）。这是例外：

org.springframework.webflow.engine.NoMatchingTransitionException: No      transition found on occurence of event 'flowInterrupted'  in state 'stateInFlow2WhereSubFlow3IsDefined' of flow 'flow2' -- valid transitional criteria are array<TransitionCriteria>[exit, contactSelected] -- likely programmer error, check the set of TransitionCriteria for this state at org.springframework.webflow.engine.TransitionableState.getRequiredTransition(TransitionableState.java:93) at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
at org.springframework.webflow.engine.SubflowState.handleEvent(SubflowState.java:116)
at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:555)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:388)
at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.endActiveFlowSession(FlowExecutionImpl.java:412)
at org.springframework.webflow.engine.impl.RequestControlContextImpl.endActiveFlowSession(RequestControlContextImpl.java:238)

当我将end state id=“flowInterrupted”更改为view state时，它可以正常工作。当从其他流调用它时，将flow1作为父流的流也可以正常工作。当我从flow3中删除parent=flow1时，我不会发现全局转换的例外。唯一的问题是，当从子流引发异常时。

任何帮助都将不胜感激——我当然可以将流程中断状态放入流程2并解决问题，但我想了解为什么会发生这种情况

谢谢

Answer 1

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