Error submitting form: multiple _flowExecutionId error

**dmfrey** · Jul 21st, 2005, 10:28 PM

All,

I am getting the following error when submitting a form:

java.lang.IllegalArgumentException: The '_flowExecutionId' parameter was unexpectedly set to an array with values: array<String>['B08E8418-491A-2636-BF05-03FDD9567586', '87B3F5AA-4C78-9907-D260-EECD2B396899']; this is likely a view configuration error: make sure you submit a single string value for the '_flowExecutionId' parameter!
org.springframework.webflow.execution.ExternalEven t.verifySingleStringInputParameter(ExternalEvent.j ava:128)
org.springframework.webflow.execution.FlowExecutio nManager.getFlowExecutionId(FlowExecutionManager.j ava:502)
org.springframework.webflow.execution.FlowExecutio nManager.onEvent(FlowExecutionManager.java:399)
org.springframework.webflow.execution.FlowExecutio nManager.onEvent(FlowExecutionManager.java:384)
org.springframework.webflow.execution.servlet.Serv letFlowExecutionManager.handle(ServletFlowExecutio nManager.java:77)
org.springframework.webflow.mvc.FlowController.han dleRequestInternal(FlowController.java:137)
org.springframework.web.servlet.mvc.AbstractContro ller.handleRequest(AbstractController.java:128)
org.springframework.web.servlet.mvc.SimpleControll erHandlerAdapter.handle(SimpleControllerHandlerAda pter.java:44)
org.springframework.web.servlet.DispatcherServlet. doDispatch(DispatcherServlet.java:684)
org.springframework.web.servlet.DispatcherServlet. doService(DispatcherServlet.java:625)
org.springframework.web.servlet.FrameworkServlet.s erviceWrapper(FrameworkServlet.java:386)
org.springframework.web.servlet.FrameworkServlet.d oPost(FrameworkServlet.java:355)
javax.servlet.http.HttpServlet.service(HttpServlet .java:709)
javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
com.opensymphony.module.sitemesh.filter.PageFilter .parsePage(PageFilter.java:118)
com.opensymphony.module.sitemesh.filter.PageFilter .doFilter(PageFilter.java:52)

No other forms in my application produce this error. The form setup is pretty straight forward. The one difference is in my FormAction, I am overriding setupForm to supply some referenceData to the form. Other than that, nothing special.

Some info about the app. At this point there isn't a whole lot to it. A couple of web flows that comprise a master-detail list, a cart and check out pages (this is where the error occurs).

The app is configured to use HttpSessionContinuations. That is all the really noteworthy stuff. BTW, I am using Spring WebFlows PR4.

Anyone run into this?

Thanks,
Dan

**Keith Donald** · Jul 22nd, 2005, 12:43 AM

That exception is thrown when its detected that you're accidently submitting the _flowExecutionId parameter TWICE (or more accurately, more than once). Check your view code.

Keith

**dmfrey** · Jul 22nd, 2005, 07:13 AM

Could this be the result of 2 submit buttons?

I am submitting the form 1 of 2 ways: submit to continue to next page in flow and submit to go back one page in the flow.

Should the back button be something other than an input type=submit?

Dan

**Keith Donald** · Jul 22nd, 2005, 09:21 AM

Pasting in your view code would help.

No, two submit buttons isn't the probem! It's that you're submitting the _flowExecutionId property twice on the same form!

Keith

**dmfrey** · Jul 22nd, 2005, 11:08 AM

I will post it when I can. I am not infront of that code right now. What would you like to see? the flow xml, the jsp?

flowExecutionId is only declared once on the page as a hidden input field.

Thanks for your help.

Dan

**Keith Donald** · Jul 22nd, 2005, 12:43 PM

jsp -- somethings submitting that _flowExecutionId twice -- it's coming in as a String array instead of a String.

Keith

**dmfrey** · Jul 22nd, 2005, 01:58 PM

Thanks Kieth, I will upload it when I get home tonight.

Dan

**dmfrey** · Jul 22nd, 2005, 07:05 PM

Keith,
Here is the jsp. It is just a simple form.

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

<html>
<head>
<title>customer</title>
</head>

<body>
<form name="customerForm" method="post">
<input type="hidden" name="_flowExecutionId" value="<c:out value="${flowExecutionId}" />" />
<input type="hidden" name="_flowId" value="cart" />
<table width="90%" border="0" cellpadding="2" cellspacing="0" align="center">
<tr>
<td colspan="3">Please fill out your Shipping Information.</td>
</tr>
<tr>
<td colspan="3"></td>
</tr>
<spring:bind path="customer.name">
<tr>
<td width="15%" class="label" nowrap>Name:</td>
<td width="50%" nowrap>
<input type="text" maxlength="50" name="<c:out value="${status.expression}" />" value="<c:out value="${status.value}"/>" />
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
</spring:bind>
<spring:bind path="customer.address">
<tr>
<td class="label" nowrap>Address:</td>
<td nowrap>
<input type="text" maxlength="50" name="<c:out value="${status.expression}" />" value="<c:out value="${status.value}"/>" />
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
</spring:bind>
<spring:bind path="customer.city">
<tr>
<td class="label" nowrap>City</td>
<td nowrap>
<input type="text" maxlength="20" name="<c:out value="${status.expression}" />" value="<c:out value="${status.value}"/>" />
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
</spring:bind>
<spring:bind path="customer.state">
<tr>
<td class="label" nowrap>State:</td>
<td nowrap>
<input type="text" size="2" maxlength="2" name="<c:out value="${status.expression}" />" value="<c:out value="${status.value}"/>" />
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
</spring:bind>
<spring:bind path="customer.zip">
<tr>
<td class="label" nowrap>Zip Code (5 or 9 digits):</td>
<td nowrap>
<input type="text" maxlength="9" name="<c:out value="${status.expression}" />" value="<c:out value="${status.value}"/>" />
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
</spring:bind>
<spring:bind path="customer.phone">
<tr>
<td class="label" nowrap>Phone Number:</td>
<td nowrap>
<input type="text" name="<c:out value="${status.expression}" />" value="<c:out value="${status.value}"/>" />
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
</spring:bind>
<tr>
<td colspan="3"></td>
</tr>
<spring:bind path="customer.shipping">
<tr>
<td class="label" nowrap>Shipping Information:</td>
<td nowrap>
<select name="<c:out value="${status.expression}" />" >
<option></option>
<c:forEach var="element" items="${model.shipping}">
<option <c:if test="${status.value == element}">selected</c:if>><c:out value="${element}" /></option>
</c:forEach>
</select>
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
</spring:bind>
<tr>
<td colspan="3"></td>
</tr>
<spring:bind path="customer.survey">
<tr>
<td valign="top" class="label" nowrap>Survey:</td>
<td nowrap>
What do you think of this application?<br /><br />
<c:forEach var="element" items="${model.survey}">
<input type="checkbox"
name="<c:out value="${status.expression}" />"
value="<c:out value="${element}" />"
<c:if test="${status.value == element}">checked</c:if>
>
<c:out value="${element}" />
</input>
<br />
</c:forEach>
</td>
<td class="error" nowrap><c:out value="${status.errorMessage}" /></td>
</tr>
<tr>
<td colspan="3"></td>
</tr>
<tr>
<td colspan="3" align="right">
<input type="submit" name="_eventId_submit" value="Continue" />

<input type="submit" name="_eventId_back" value="Back" />
</td>
</tr>
</spring:bind>
</table>
</form>
</body>
</html>

Thanks again for your help.

Dan

**Keith Donald** · Jul 22nd, 2005, 10:03 PM

Dan,

Looks OK to me.

The only thing I can suggest is:
<input type="hidden" name="_flowId" value="cart" />

... isn't needed, as this view is participating in an existing FlowExecution already associated with a Flow definition (which _flowId identifies for the purpose of launching new flow executions.)

Still, that could not cause this problem. I don't understand it based on what I've seen so far--but it's clear the _flowExecutionId coming in the HTTP request as a String[] of 2 elements instead of a single String...

What's even weirder is based on your logs, the two _flowExecutionId values are DIFFERENT:

java.lang.IllegalArgumentException: The '_flowExecutionId' parameter was unexpectedly set to an array with values: array<String>['B08E8418-491A-2636-BF05-03FDD9567586', '87B3F5AA-4C78-9907-D260-EECD2B396899']; this is likely a view configuration error: make sure you submit a single string value for the '_flowExecutionId' parameter!

I would expect them to be the same had the view accidently submitted it twice...

Let me know if you figure out what is causing this. Perhaps a filter thats running before the request is submitted to the webflow system?

Keith

**dmfrey** · Jul 22nd, 2005, 10:24 PM

Keith,

That is a good thing to mention. There is a filter that is intercepting all of my requests. I am using SiteMesh as a templating engine. Could SiteMesh be interfering with, or possibly re-submitting the form? Would a new flowExecutionId be generated because of this? So far, all of my flows have been navigated with links, sending a GET request? I will look into these and report back.

Dan

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