3 Replies Latest reply on Jul 16, 2008 10:12 PM by gjeudy

Property 'foo' not found on type org.javassist.tmp.java.lang.Object_$$_javassist_1

mcheely Jul 16, 2008 4:53 PM

I've created the following seam component in a new seam-gen project

package org.jboss.helloworld;

import javax.ejb.Remove;
import javax.ejb.Stateful;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Out;
import org.jboss.seam.annotations.Scope;

@Stateful
@Scope(ScopeType.SESSION)
@Name("testAction")
public class TestAction implements TestActionInterface {

     @Out
     public String foo = "test";
     
     @Remove
     public void destroy() {}
     
}

package org.jboss.helloworld;

import javax.ejb.Local;

@Local
public interface TestActionInterface {

     public void destroy();
     
}

And here's the jsf page that references the component:

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
                             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:s="http://jboss.com/products/seam/taglib"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:rich="http://richfaces.org/rich"
                template="layout/template.xhtml">

<ui:define name="body">
     <h:messages globalOnly="true" styleClass="message"/>
     
          <rich:panel>
               <f:facet name="header">Test</f:facet>
     
               <h:outputText value="#{testAction.foo}"/>
               
          </rich:panel>

</ui:define>
</ui:composition>

This seems like something incredibly basic that should work, but when I point my browser at the page, I get this error:

javax.faces.FacesException: javax.el.PropertyNotFoundException: /testPage.xhtml @18,45 value="#{testAction.foo}": Property 'foo' not found on type org.javassist.tmp.java.lang.Object_$$_javassist_1
     at javax.faces.component.UIOutput.getValue(UIOutput.java:176)
     at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:189)
     at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:320)
     at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:200)
     at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:836)
     at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:286)
     at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:262)
     at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:199)
     at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:194)
     at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:121)
     at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
     at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
     at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
     at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:216)
     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
     at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281)
     at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
     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:230)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
     at java.lang.Thread.run(Thread.java:619)
Caused by: javax.el.PropertyNotFoundException: /testPage.xhtml @18,45 value="#{testAction.foo}": Property 'foo' not found on type org.javassist.tmp.java.lang.Object_$$_javassist_1
     at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:73)
     at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
     ... 56 more

It looks like the JSF page is trying to access the component as a basic java Object, but I can't imagine why. I can copy examples from the Seam documentation and they seem to work fine, so I don't think there's an issue with my setup. Can anybody see why this code doesn't work?

1. Re: Property 'foo' not found on type org.javassist.tmp.java.lang.Object_$$_javassist_1

gjeudy Jul 16, 2008 4:58 PM (in response to mcheely)
try:

<h:outputText value="#{foo}"/>

if you really need:

<h:outputText value="#{testAction.foo}"/>

You need to add a getter: getFoo(). The above EL expression is a property access so by java beans standard you need a getter. You may also need a setter, I don't recall, I use the first form more often than not.
Actions
2. Re: Property 'foo' not found on type org.javassist.tmp.java.lang.Object_$$_javassist_1

mcheely Jul 16, 2008 6:07 PM (in response to mcheely)
Thanks, Guillaume. I'm new to EJB as well as seam.

<h:outputText value="#{foo}"/>

Didn't work for me - the page rendered without error, but it was just blank.

However, adding a getter and using #{testAction.foo} did work, and that's the behavior I'm looking for.

I had thought I didn't need a getter since some of the examples used EJB's without getters, but I see now upon looking closer that they were just using something like #{foo} to access the property. Just out of curiosity - what happens if you access your properties in that method and you have two components that both outject something called 'name', for example? Do they just clobber each other?
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3. Re: Property 'foo' not found on type org.javassist.tmp.java.lang.Object_$$_javassist_1

gjeudy Jul 16, 2008 10:12 PM (in response to mcheely)

You have to trigger an action on testAction otherwise foo will never get outjected in the SESSION scope, that's why it evaluates to blank.

If you outject 2 vars called name from 2 components, one might overwrite the other or shadow it, depending into which scope you outject the var.

For example if you have 2 components participating in the same conversation and outject name to CONVERSATION scope, then the last component to outject will overwrite 'name'.

However if your 2 components participate in separate CONVERSATIONs then no overwriting will occur and each component will outject it's name value with no side-effect.

If you outject to SESSION in 1 component and to CONVERSATION in the other component then depending on how you inject name back may get one or the other. I suggest you read up on Seam contexts and bijection in general:
Section 4.1, 4.2, 4.3 of Seam doc.

Seam Contexts
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