Cheers, Mike, that eases my confusion a little. I thought I might have been
doing something wrong...
Is it possible to convert the EL return value to the right type? The
updateActionListener docs state "An optional Converter may be associated
with this listener, and if present will be invoked to convert the value to
the datatype expected by the target property."
I tried using converter="javax.faces.Integer" to force the conversion to an
int, but this got me nowhere at all.
I'm pretty new to JSF, and I have the feeling I'm barking up the wrong tree
- any help appreciated.
Cheers,
Mike Kienenberger wrote:
>
>> Is it expected behaviour for an EL arithmetic expression to always return
>> a
>> Long?
>
> Yes. Or a Double if the value cannot be represented as a Long.
>
>
>
> On 5/31/07, gazlm <[EMAIL PROTECTED]> wrote:
>>
>> I have a problem with type conversions when using updateActionListener to
>> set
>> an int property in a backing bean...
>>
>> I'm using a bean which has properties pageNum and numPages, and I have
>> command links that refresh the page, with an updateActionListener
>> changing
>> the value of the pageNum property.
>>
>> If I use the updateActionListener like this:
>>
>> <t:updateActionListener property="#{bean.pageNum}" value="0" />
>>
>> then I have no problems, but if I try to do something like this:
>>
>> <t:updateActionListener property="#{bean.pageNum}"
>> value="#{bean.pageNum+1}"
>> />
>>
>> then I get an exception:
>>
>> javax.faces.el.EvaluationException: Exception setting property helloCount
>> of
>> base with class demo.GetNameBean, caused by an argument type mismatch.
>> The
>> full stack trace is attached below.
>>
>> From debugging through the code while running, it seems that when I do
>> any
>> arithmetic in a JSF EL expression, the result is a Long, which can't be
>> used
>> as an argument when the required type is int.
>>
>> If I change my bean to accept a Long instead of an int, the problem goes
>> away, but that doesn't seem ideal to me...
>>
>> Does anyone else have this problem?
>> Is it expected behaviour for an EL arithmetic expression to always return
>> a
>> Long?
>>
>> Cheers.
>>
>> ERROR [[/testMyFaces].[Faces Servlet]:http-8080-Processor25] -
>> Servlet.service() for servlet Faces Servlet threw exception
>> javax.faces.el.EvaluationException: Exception setting property pageNum of
>> base with class com.gaz.Bean
>> at
>> org.apache.myfaces.el.PropertyResolverImpl.setValue(PropertyResolverImpl.java:185)
>> at
>> org.apache.myfaces.el.ValueBindingImpl.setValue(ValueBindingImpl.java:275)
>> at
>> org.apache.myfaces.custom.updateactionlistener.UpdateActionListener.processAction(UpdateActionListener.java:156)
>> at
>> javax.faces.event.ActionEvent.processListener(ActionEvent.java:48)
>> at
>> javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:484)
>> at javax.faces.component.UICommand.broadcast(UICommand.java:75)
>> at
>> javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:94)
>> at
>> javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:168)
>> at
>> org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:343)
>> at
>> org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
>> at javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
>> at
>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>> at
>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>> at
>> org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)
>> at
>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
>> at
>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>> at
>> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>> at
>> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>> at
>> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>> at
>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>> at
>> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>> at
>> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>> at
>> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>> at
>> org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
>> at
>> org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>> at
>> org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>> at
>> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>> at java.lang.Thread.run(Thread.java:595)
>> Caused by: javax.faces.el.EvaluationException: Bean: com.gaz.Bean,
>> property:
>> pageNum
>> at
>> org.apache.myfaces.el.PropertyResolverImpl.setProperty(PropertyResolverImpl.java:410)
>> at
>> org.apache.myfaces.el.PropertyResolverImpl.setValue(PropertyResolverImpl.java:173)
>> ... 27 more
>> Caused by: java.lang.IllegalArgumentException: argument type mismatch
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>> at java.lang.reflect.Method.invoke(Method.java:585)
>> at
>> org.apache.myfaces.el.PropertyResolverImpl.setProperty(PropertyResolverImpl.java:406)
>> ... 28 more
>>
>> --
>> View this message in context:
>> http://www.nabble.com/argument-type-mismatch-when-setting-property-with-updateActionListener-tf3846565.html#a10894017
>> Sent from the MyFaces - Users mailing list archive at Nabble.com.
>>
>>
>
>
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