IncompatibleClassChangeError: Implementing class

In my case this was caused by incompatible versions of hibernate in the classpath...

2010-10-19 12:40:32,271:ERROR   Problem encountered during View.servePage       - com.icesoft.faces.context.View
java.lang.IncompatibleClassChangeError: Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:983)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1501)
        at za.co.enerweb.nampower.report.hibernate.HibernateSessionFactory.(HibernateSessionFactory.java:60)

Why can't icefaces give proper error messages? II

After days of searching and experimentation it seems that its not possible to dynamically import
a .jspx file into another (one which is loaded from a jar, and the src location is supplied by the backing bean).

I'm trying to embed iframes now, but as soon as the iframes render, icefaces freezes up and does not send any events again. The only clue was this javascript error:

Error: no element found
Source File: http://localhost:17080/EbrWeb/block/receive-updated-views
Line: 1

After searching and a hunch that concurrently loading jspx pages breaks icefaces, I looked at the portlet sample
(ICEfaces-1.8.2-src/icefaces/samples/portlet/location/web/WEB-INF/web.xml).

I found that if I include the following in my web.xml, it works! Hurray!

<context-param>
  <param-name>com.icesoft.faces.concurrentDOMViews</param-name>
  <param-value>true</param-value>
</context-param>

This makes sense because I want to load several iceface pages in iframes in my main page.

Why can't icefaces give proper error messages?

SEVERE: StandardWrapperValve[Persistent Faces Servlet]: PWC1406: Servlet.service() for servlet Persistent Faces Servlet threw exception
java.lang.Exception: javax.faces.FacesException: Problem in renderResponse: null

was trying to tell me:

<ice:tree> needed to be encapsulated inside an <ice:form>.

http://seamframework.org/Community/ProblemWithIceTree#comment101040

(Ice)faces hates me and Richard

After Richard Kolb and I have struggled with this for days, I finally cracked it.

We defined some dropdowns, and radio buttons in icefaces eg:

<ice:selectOneRadio id="reportColumnIndexRadio"
    value="#{scratchPad.reportColumnIndex}"
     partialSubmit="true"
     layout="pageDirection">
    <f:selectItems
        value="#{scratchPad.reportColumnIndexSelectItemList}" />
</ice:selectOneRadio>

<ice:selectOneMenu id="reportColumnIndex"
    value="#{scratchPad.reportColumnIndex}"
    partialSubmit="true">
    <f:selectItems
        value="#{scratchPad.reportColumnIndexSelectItemList}" />
</ice:selectOneMenu>

but when a new item was selected nothing happened, we just got this VERY cryptic log entry e.g:

sourceId=reportEditorForm:j_id14[severity=(ERROR 2), 
summary=(reportEditorForm:j_id14: 
An error occurred when processing your submitted information. ),
detail=(reportEditorForm:j_id14:
An error occurred when processing your submitted information. )]

After hours of (debugging, guessing, googling, repeat) loops,
I finally found this link which explains it a number of times:
http://www.icefaces.org/JForum/posts/list/7965.page

Faces or icefaces does not automagically serialise or cache objects when sending it to the browser!
It converts to/from Strings if it can
and tries to waste as much of your time as possible if it can't!

So my fix was setting the selectItem's value to our DB Id in stead of the object,
using the Id property for the SelectOne value.
Then on partial submit when the setter gets called,
we have to iterate through the cached list to find the one matching the Id to set the real property.

<ice:selectOneMenu id="reportColumnIndex"
    value="#{scratchPad.reportColumnIndexId}"
    partialSubmit="true">
    <f:selectItems
        value="#{scratchPad.reportColumnIndexSelectItemList}" />
</ice:selectOneMenu>