Webflow 2: view not binding with the model

[Rohit Bhal]

Hi

Could someone help me understand what am i missing in getting in binding my view with the model?

Here is the error:

org.springframework.binding.expression.PropertyNotFoundException: Property not found
	at org.springframework.binding.expression.ognl.OgnlExpression.getValue(OgnlExpression.java:87)
	at org.springframework.webflow.mvc.view.BindingModel.getFormattedValue(BindingModel.java:240)
	at org.springframework.webflow.mvc.view.BindingModel.getFieldValue(BindingModel.java:141)
	at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:120)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:172)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:192)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:158)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:121)
	at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:379)
	at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:139)
	at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:90)
	at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:77)
	at org.apache.jsp.pages.sp.story.reg_005fLoc_005fstep2_jsp._jspx_meth_form_005finput_005f0(reg_005fLoc_005fstep2_jsp.java:1657)
	at org.apache.jsp.pages.sp.story.reg_005fLoc_005fstep2_jsp._jspx_meth_form_005fform_005f0(reg_005fLoc_005fstep2_jsp.java:1573)
	at org.apache.jsp.pages.sp.story.reg_005fLoc_005fstep2_jsp._jspService(reg_005fLoc_005fstep2_jsp.java:498)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:236)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
	at org.springframework.webflow.mvc.servlet.ServletMvcView.doRender(ServletMvcView.java:50)
	at org.springframework.webflow.mvc.view.AbstractMvcView.render(AbstractMvcView.java:180)
	at org.springframework.webflow.engine.ViewState.render(ViewState.java:282)
	at org.springframework.webflow.engine.ViewState.refresh(ViewState.java:241)
	at org.springframework.webflow.engine.ViewState.resume(ViewState.java:219)
	at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
	at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
	at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:163)
	at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
	at org.springframework.webflow.mvc.servlet.FlowController.handleRequest(FlowController.java:174)
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378)
	at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
	at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.ui.SessionFixationProtectionFilter.doFilterHttp(SessionFixationProtectionFilter.java:67)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.ui.rememberme.RememberMeProcessingFilter.doFilterHttp(RememberMeProcessingFilter.java:116)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.ui.basicauth.BasicProcessingFilter.doFilterHttp(BasicProcessingFilter.java:174)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:278)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235)
	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
	at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Unknown Source)
Caused by: ognl.NoSuchPropertyException: java.util.HashSet.0
	at ognl.SetPropertyAccessor.getProperty(SetPropertyAccessor.java:68)
	at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2210)
	at ognl.ASTProperty.getValueBody(ASTProperty.java:114)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
	at ognl.SimpleNode.getValue(SimpleNode.java:258)
	at ognl.ASTChain.getValueBody(ASTChain.java:141)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
	at ognl.SimpleNode.getValue(SimpleNode.java:258)
	at ognl.Ognl.getValue(Ognl.java:494)
	at org.springframework.binding.expression.ognl.OgnlExpression.getValue(OgnlExpression.java:85)
	... 93 more

The problem I am having is like this:

I have a domain object A like below:

A.java

public class A {
    private Set<B> b;

    setters and getters..
}

B.java

public class B {
    private C c;

    setters and getters..
}

Now I have form for which I have set the command object as A and I am trying to insert the value in Set using b[${indexOfTheElement}].somePropertyOfClassB, I have set the model in the flow file with the <view-state> like below:


something-flow.xml

<var name="a" class="somepackage.A" />
<view-state id="Bdetails" view="/somePath" model="a">
    <transition on="submit" to="addB" />
</view-state>

<action-state id="addB">
    ...
</action-state>

addB.jsp

<form:form commandName="a" action="${flowExecutionUrl}" >
    Enter the value for someProperty of B: <form:input path=" b[${indexOfTheElementOfTypeB}].somePropertyOfClassB" />
    <input type="submit" name="_eventId_submit" value="submit"/>
</form:form>

Thanks