关于Spring Webflow：Spring Webflow-使用multipart / form-data和文件上传时IllegalStateException

Spring Webflow - IllegalStateException when using multipart/form-data and file upload

我正在尝试将文件上传添加到我的Spring Webflog表单处理中。只要表单enctype未设置为multipart / form-data，表单提交就可以正常工作。但是，当我在Spring表单中添加enctype =" multipart / form-data"后，就会发生此异常：

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java.lang.IllegalStateException: A flow execution action URL can only be obtained in a RenderRequest or a ResourceRequest
at org.springframework.webflow.context.portlet.PortletExternalContext.getFlowExecutionUrl(PortletExternalContext.java:215)
at org.springframework.webflow.engine.impl.RequestControlContextImpl.getFlowExecutionUrl(RequestControlContextImpl.java:178)
at org.springframework.webflow.mvc.view.AbstractMvcView.render(AbstractMvcView.java:189)
at org.springframework.webflow.engine.ViewState.render(ViewState.java:293)
at org.springframework.webflow.engine.ViewState.refresh(ViewState.java:242)
at org.springframework.webflow.engine.ViewState.resume(ViewState.java:220)
at org.springframework.webflow.engine.Flow.resume(Flow.java:537)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
at org.springframework.webflow.mvc.portlet.FlowHandlerAdapter.handleAction(FlowHandlerAdapter.java:161)
at org.springframework.web.portlet.DispatcherPortlet.doActionService(DispatcherPortlet.java:670)
at org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:520)
at org.springframework.web.portlet.FrameworkPortlet.processAction(FrameworkPortlet.java:461)
at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:71)

我已经将CommonsMultipartResolver添加到我的spring上下文中：

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并在我的pom.xml中包含commons-fileupload.jar：

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<dependency>
<groupId>commons-fileupload</groupId>
commons-fileupload</artifactId>
<version>1.2.2</version>
</dependency>

我的JSP如下所示：

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<portlet:actionURL var="processFormAction">
<portlet:param name="execution" value="${flowExecutionKey}"/>
</portlet:actionURL>
<form:form action="${processFormAction}" modelAttribute="customerModel" enctype="multipart/form-data" method="post">
<form:input path="firstName" cssClass="input-size-1 valid-required" />
<form:input path="lastName" cssClass="input-size-1 valid-required" />
<input name="avatar" id="avatar" type="file"/>
<input type="submit" name="_eventId_submit" id="send" value="Submit"/>
</form:form>

我的flow.xml定义：

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<view-state id="state1" model="customerModel">
...
<transition on="submit" to="submitFormActions"/>
</view-state>

<evaluate expression="portletAction.processForm(customerModel, flowRequestContext)" />
<transition on="success" to="state2"/>
<transition on="error" to="state1" />
</action-state>

模型对象：

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public class CustomerModel implements Serializable{
private String firstName;
private String lastName;
private MutlipartFile avatar;

...
//public getters and setters
}

有什么想法可能是错的吗？如我所说，如果没有enctype =" multipart / form-data"，则表单处理效果很好。

谢谢